V34a Hearing Loop Drivers
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Specifications
- Models: V22a, V34, V34a
- Release Date: October 2024
Product Overview
Note: For large area hearing loop installation instructions,
consult Contacta’s Large Area Hearing Loop Installation Guide.
Components
Below are the components included with each model:
- V22a:
- NL4 Connector x2
- Rubber Feet x4
- 3.5mm Euroblock Connector x2
- Signage
- V22a Hearing Loop Driver
- Installation & User Guide
- Mounting Brackets
- IEC Power Lead*
- V34:
- NL4 Connector
- Rubber Feet x4
- 3.5mm Euroblock Connector x2
- Signage
- V34 Hearing Loop Driver
- Installation & User Guide
- Mounting Brackets
- IEC Power Lead*
- V34a:
- NL4 Connector x2
- Rubber Feet x4
- 3.5mm Euroblock Connector x2
- Signage
- V34a Hearing Loop Driver
- Installation & User Guide
- Mounting Brackets
- IEC Power Lead*
Suitable Cable Lengths
The tables below show the approximate maximum cable lengths
based on current and impedance for different cable types:
Driver Area Coverage
The driver area coverage depends on the specific model and loop
design. Consult the user guide for detailed coverage
information.
Connections
Properly connect the NL4 connectors, Euroblock connectors, and
power lead as per the installation guide.
Using the System
Follow the menu options for inputs, guided loop setup, manual
loop setup, diagnostics, service, and saving/loading settings to a
USB flash drive.
FAQs
Q: Can the V22a driver be used with a double-turn hearing
loop?
A: Yes, the V22a driver can be used with both single-turn and
double-turn hearing loops. Refer to the cable length tables for
appropriate cable lengths.
Q: How do I update the system software?
A: System updates can be performed by following the instructions
in the user manual under the “System Updates” section.
Q: What should I do if I encounter loop resistance issues?
A: Troubleshooting steps for loop resistance issues are detailed
in the “Troubleshooting” section of the user manual.
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V22a / V34 / V34a
October 2024
1
Contents
Product Overview Components Suitable Cable Lengths Driver Area Coverage Connections Using the System Inputs Menu Guided Loop Setup Manual Loop Setup Diagnostics Service Save/Load Settings to USB Flash Drive System Updates Remote Monitoring Contacta Dashboard Troubleshooting Notification Guide Loop Resistance Technical Specification Standards
3 4-5 6-9 10-11 12-13 14-16 17-18 19-24 25-29 30-31 32 33 34-36 37 39-50
51 52 53-55 56-55 59
Contacta has a policy of continuous product development, therefore small specification changes
may not be reflected in this manual. Images, labels, packaging, accessories and product colours
are subject to change without notice.
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Product Overview
Our highly efficient and slimline V Series PRO range of hearing loop drivers (V22a, V34, and V34a) are suitable for medium to large facilities and venues. The V34 is a high current hearing loop driver which powers hearing loops utilising a single output. The V22a and V34a are dual output, high current hearing loop drivers with integral phase shifters for phased array configurations. These drivers have a Class-D amplifier output stage and an audio subsystem built around advanced digital systems including an ARM Cortex processor and dual DSPs. Combined with a powerful CPU to ensure peak performance, the V Series PRO range provides self-monitoring and email alerts, remote setup over local area networks, guided hearing loop setup to make installation simple, and excellent speech and music reproduction.
Note: For large area hearing loop installation instructions, consult Contacta’s Large Area Hearing Loop Installation Guide.
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Components
V22a
5
1
8
6
23
4
7
1. NL4 Connector x2 2. Rubber Feet x4 3. 3.5mm Euroblock Connector x2 4. Signage
5. V22a Hearing Loop Driver 6. Installation & User Guide 7. Mounting Brackets 8. IEC Power Lead*
V34
5
1
8
6
2
3
4
7
1. NL4 Connector 2. Rubber Feet x4 3. 3.5mm Euroblock Connector x2 4. Signage
5. V34 Hearing Loop Driver 6. Installation & User Guide 7. Mounting Brackets 8. IEC Power Lead*
*Plug type varies by country. 4
V34a
5
1
8
6
23
4
1. NL4 Connector x2 2. Rubber Feet x4 3. 3.5mm Euroblock Connector x2 4. Signage
7
5. V34a Hearing Loop Driver 6. Installation & User Guide 7. Mounting Brackets 8. IEC Power Lead*
*Plug type varies by country.
Cable & Equipment: A length of loop cable determined by the loop design is also required. Hearing loop drivers also require additional equipment for audio feeds, such as a microphone or sound system.
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Suitable Cable Lengths
The tables in this section show the approximate maximum cable lengths for differing maximum required currents.
Loop impedance (at 1.6kHz) should be less than the voltage capability of the driver (V22a: 22Vrms, V34: 34Vrms, V34a: 34Vrms) divided by the required current.
This achieves 400mA/m field strength at 1kHz.
V22a Single-Turn Hearing Loop (Metric)
Current
1A
2A
3A
Impedance 21.3 10.7 7.1
4A 5.3
5A 4.3
6A 3.6
7A 3.0
8A 2.7
Cable Type
Maximum Cable Length
Round Cable (AWG)
1mm 1.5mm
2.5mm
Flat Cable (Width)
10mm 12.5mm
25mm
Cable Length 782m 391m 917m 458m 1031m 515m 580m 290m 1097m 548m 1452m 726m
261m 306m 344m 193m 366m 484m
195m 229m 258m 145m 274m 363m
156m 183m 206m 116m 219m 290m
130m 153m 172m 97m 183m 242m
112m 131m 147m 83m 157m 207m
98m 115m 129m 73m 137m 182m
V22a Single-Turn Hearing Loop (Imperial)
Current
1A
2A
3A
4A
5A
6A
7A
Impedance 36.0 18.0 12.0 9.0 7.2 6.0 5.1
8A 4.5
Cable Type
Cable Length
Maximum Cable Length
Round Cable (AWG)
18AWG 14AWG
2346ft 1173ft 782ft 587ft 3132ft 1566ft 1044ft 783ft
Flat Cable 18AWG
2639ft 1320ft 880ft
(Width)
(equivalent)
660ft
469ft 626ft 528ft
391ft 522ft 440ft
335ft 447ft 377ft
293ft 392ft 330ft
14AWG
4171ft
(equivalent)
2085ft 1390ft 1043ft 834ft
695ft
596ft
521ft
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V22a Double-Turn Hearing Loop (Metric)
Current 1A
2A
3A
Impedance 21.3 10.7 7.1
4A 5.3
5A 4.3
6A 3.6
7A 3.0
8A 2.7
Cable Type
Max Cable Length
Round Cable (AWG)
Flat Cable (Width)
1mm 1.5mm 2.5mm 10mm 12.5mm 25mm
Cable Length 568m 284m 189m 142m 614m 307m 205m 154m 645m 323m 215m 161m 508m 254m 169m 127m 785m 392m 262m 196m 929m 465m 310m 232m
114m 123m 129m 102m 157m 186m
95m 102m 108m 85m 131m 155m
81m 88m 92m 73m 112m 133m
71m 77m 81m 63m 98m 116m
V22a Double-Turn Hearing Loop (Imperial)
Current
1A
2A
3A
4A
5A
6A
7A
Impedance 36.0 18.0 12.0 9.0 7.2 6.0 5.1
8A 4.5
Cable Type
Cable Length
Maximum Cable Length
Round Cable (AWG)
18AWG 14AWG
2649ft 1324ft 883ft 662ft 3027ft 1514ft 1009ft 757ft
Flat Cable 18AWG
3203ft 1601ft 1068ft 801ft
(Width)
(equivalent)
530ft 605ft 641ft
441ft 505ft 534ft
378ft 432ft 458ft
331ft 378ft 400ft
14AWG
4202ft 2101ft
(equivalent)
1401ft
1050ft 840ft
700ft
600ft
525ft
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V34 / V34a Single-Turn Hearing Loop (Metric)
Current Impedance
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A 11A 12A
21.30 10.65 7.10 5.33 4.26 3.55 3.04 2.66 3.57 3.21 2.92 2.68
Cable Type
Cable Length
Max Round Cable Cable Length (AWG)
1mm 1.5mm
1146.1m 573.0m 382.0m 286.5m 229.2m 191.0m 163.7m 143.3m 127.3m 114.6m 104.2m 95.5m 1379.2m 689.6m 459.7m 344.8m 275.8m 229.9m 197.0m 172.4m 153.2m 137.9m 125.4m 114.9m
2.5mm 1550.7m 775.3m 516.9m 387.7m 310.1m 258.4m 221.5m 193.8m 172.3m 155.1m 141.0m 129.2m
Flat
10mm 872.7m 436.3m 290.9m 218.2m 174.5m 145.4m 124.7m 109.1m 97.0m 87.3m 79.3m 72.7m
Cable
(Width) 12.5mm 1650.4m 825.2m 550.1m 412.6m 330.1m 275.1m 235.8m 206.3m 183.4m 165.0m 150.0m 137.5m
25mm 2184.9m 1092.4m 728.3m 546.2m 437.0m 364.1m 312.1m 273.1m 242.8m 218.5m 198.6m 182.1m
V34 / V34a Single-Turn Hearing Loop (Imperial)
Current Impedance
1A
2A
3A 4A
5A
6A
7A
8A
9A
10A 11A 12A
21.30 10.65 7.10 5.33 4.26 3.55 3.04 2.66 3.57 3.21 2.92 2.68
Cable Type
Cable Length
Max Round Cable Cable Length (AWG)
18AWG 1105.5ft 552.7ft 368.5ft 276.4ft 221.1ft 184.2ft 157.9ft 138.2ft 122.8ft 110.5ft 100.5ft 92.1ft 14AWG 1476.0ft 738.0ft 492.0ft 369.0ft 295.2ft 246.0ft 210.9ft 184.5ft 164.0ft 147.6ft 134.2ft 123.0ft
Flat Cable (Width)
18AWG (equiv.)
14AWG (equiv.)
1243.6ft 621.8ft 414.5ft 310.9ft 248.7ft 207.3ft 177.7ft 155.4ft 138.2ft 124.4ft 113.1ft 103.6ft 1965.2ft 982.6ft 655.1ft 491.3ft 393.0ft 327.5ft 280.7ft 245.6ft 218.4ft 196.5ft 178.7ft 163.8ft
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V34 / V34a Double-Turn Hearing Loop (Metric)
Current Impedance
1A
2A 3A 4A 5A 6A 7A 8A 9A 10A 11A 12A
32.1 16.0 10.7 8.0 6.4 5.3 4.6 4.0 3.6 3.2 2.9 2.7
Cable Type
Cable Length
Max Round 1mm 855m 427m 285m 214m 171m 142m 122m 107m 95m 85m 78m 71m Cable Cable Length (AWG) 1.5mm 924m 462m 308m 231m 185m 154m 132m 116m 103m 92m 84m 77m
2.5mm 971m 485m 324m 243m 194m 162m 139m 121m 108m 97m 88m 81m
Flat
10mm 764m 382m 255m 191m 153m 127m 109m 95m 85m
Cable
(Width) 12.5mm 1181m 590m 394m 295m 236m 197m 169m 148m 131m
76m 118m
69m 64m 107m 98m
25mm 1398m 699m 466m 350m 280m 233m 200m 175m 155m 140m 127m 117m
V34 / V34a Double-Turn Hearing Loop (Imperial)
Current Impedance
1A
2A
3A 4A 5A 6A 7A 8A 9A 10A 11A 12A
36.0 18.0 12.0 9.0 7.2 6.0 5.1 4.5 4.0 3.6 2.9 2.7
Cable Type
Cable Length
Max Round Cable Cable Length (AWG)
18AWG 2649ft 1324ft 883ft 662ft 530ft 441ft 378ft 331ft 294ft 265ft 241ft 221ft 14AWG 3027ft 1514ft 1009ft 757ft 605ft 505ft 432ft 378ft 336ft 303ft 275ft 252ft
Flat Cable (Width)
18AWG (equiv.)
14AWG (equiv.)
3203ft 1601ft 4202ft 2101ft
1068ft 801ft 641ft 534ft 458ft 400ft 356ft 320ft 291ft 267ft 1401ft 1050ft 840ft 700ft 600ft 525ft 467ft 420ft 382ft 350ft
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Driver Area Coverage
Note: A full site survey of an installation area is recommended for optimal loop design.
Perimeter Loops
Perimeter loop areas detailed in the table on page 11 are valid only when the following conditions are met:
1. Area is at the maximum current the driver is capable of delivering without voltage clipping at 1.6KHz
2. Loop layout is designed to achieve 0dB in the centre 3. 25mm x 0.1mm flat copper cable 4. Loop is installed in the floor 5. Listening height 1.2m (large perimeter loops may have areas where
the actual signal level is higher than required)
Phased Array Loops
Phased array loop areas detailed in the table on page 11 are valid only when the following conditions are met:
1. Area is at the maximum voltage the driver is capable of delivering without voltage clipping at 1.6KHz
2. Layout of 3m segment widths 3. 25mm X 0.1mm flat copper cable is used 4. Loop is installed in the floor 5. Listening height 1.2m 6. Medium metal loss = 6dB
10
Voltage
V34 Pro
34.0V
V22a Pro V34a Pro
22.6V 34.0V
V22a Pro V34a Pro
22.6V 34.0V
Area
Current
1:1
1:2
1:3
Perimeter loops
12.0A
702.25m² 882.00m² 1200.00m²
Phased array (no metal loss)
8.0A
1024.00m² 1104.50m² 1160.33m²
12.0A
1521.00m² 1740.50m² 1680.33m²
Phased array (medium metal loss)
8.0A
441.00m² 480.50m² 588.00m²
12.0A
676.00m² 840.50m² 867.00m²
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Connections
Rear Panel Connections
1
2
3
4
5
6
7
8
1. Power Supply Input – The primary method of isolating the amplifier from the mains supply is to disconnect the mains plug. Ensure that the mains plug remains accessible at all times. Unplug the AC power cord from the AC outlet if the unit will not be used for
several months or more. 2. Network Input – Ethernet port for setup and remote monitoring. 3. Input A – Microphone or line in via 3 Pin Euroblock or XLR. 4. Input B – Microphone or line in via 3 Pin Euroblock or XLR. 5. Line Output – XLR port for connections with multiple drivers. 6. USB – Storage transfer port. 7. Loop A Output – NL4 port for Loop A. 8. Loop B Output – NL4 port for Loop B.
Connection Examples
XLR to XLR (line)
2-CONDUCTOR SHIELDED CABLE
TRS to XLR (line) 12
2-CONDUCTOR SHIELDED CABLE
Unbalanced to XLR
2-CONDUCTOR SHIELDED CABLE
XLR to Euroblock (balanced)
2-CONDUCTOR SHIELDED CABLE
Unbalanced to Euroblock
2-CONDUCTOR SHIELDED CABLE
Loop Connections Connect a twisted pair or quad core loop feeder cables to the supplied NL4 connector (see diagram below). Insert the NL4 Connector into the NL4 Loop Output Connection on the rear of the driver.
1-
1+
1- 1+
2+ 2-
2+
2-
CAUTION: Route loop output cables as far away as possible from the driver audio input cables.
13
Using the System
Startup
V Series PRO drivers perform a series of tests when powered on. The Contacta logo will appear and driver will therefore take between 40 to 60 seconds to become active. Fault Detected If a fault is detected, the Attention symbol will appear on the top right of the screen ( ! ) along with an error message: 1. Open Circuit [Primary/Secondary Loop]: See Connections on page
12 or consult the Contacta Large Area Loop Installation Guide to ensure the hearing loop is correctly installed and connected. 2. Short Circuit [Primary/Secondary Loop]: See Connections on page 12 or consult the Contacta Large Area Loop Installation Guide to ensure the hearing loop is correctly installed and connected. The start-up sequence will be halted. Power should be removed and reapplied to the driver once the fault has been addressed. Loop Attenuation
If the `ATTN’ (Loop Attenuation) symbol ( ATTN ) appears on the screen, the driver has detected that due to the characteristics of the loop(s) connected it will be unable to deliver maximum rated current without clipping at 1.6Kz. Maximum current will therefore be attenuated. 14
Front Panel Overview
1. Display Screen – Displays menu and adjustment options. 2. Control Dial – Used to unlock the driver and make a range of
system adjustments. Rotate the dial clockwise or counter-clockwise to make a selection, then press to confirm any adjustments. Note: When using V Series PRO menus, selecting “Return” sends the user to a previously displayed screen. Selecting “Exit” will send them to the main menu.
Locking/Unlocking the Hearing Loop Driver
Unlock the Driver 1. To unlock the hearing loop driver, press the control dial, and when
prompted “Unlock driver?” click “Yes.” 2. Enter the passcode 2239:
a. Rotate the control clockwise to select the first required digit. b. Press the control dial in to select the digit. c. Repeat steps (a) and (b) until all the digits have been selected. Note: Entering the wrong code returns the hearing loop driver to the lock screen. When the control dial is not used for half an hour, the hearing loop driver will automatically lock.
15
Signal Activity Indicators
When the driver is locked, the “ABC” indicators on the bottom left of the screen display signal activity on the driver inputs.
Each letter are shown in green, yellow, or red, corresponding to low, good, or high signal levels respectively. The “A” and “B” indicators show the levels of the A and B inputs. This is the level after the corresponding input gain control, but before the AGC. If the AGC is not enabled, it is important that A or B are indicating acceptable levels. If the AGC is enabled, this is less important as the AGC will compensate for a wide range of levels. The “C” indicator shows the signal level within the signal chain after the AGC, if enabled, has been applied. It is normal to see activity here, at least on program peaks. If the driver appears to stop working, and no changes have been made, the ABC indicators will assist the user by showing whether the inputs are active.
Main Menu
After being unlocked, the hearing loop driver will display the main menu.
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Inputs
Selecting Inputs from the main menu opens the following screen:
· Input A – Adjust connections to Input A. · Input B – Adjust connections to Input B. · Audio Time Delay – Sync audio across large distances to
compensate for latency. · Low Cut Filter – Audio filter for when there is low frequency
background noise in the surrounding environment of a loop.
Input A/B
1. Menus for Input A and Input B are functionally identical. Selecting either Input A or Input B opens the following screen:
2. Turning on Phantom Power sends power to a connected microphone via the selected input. When either Input A or Input B has enabled this function, a symbol will appear on the left of the display (see page 51 for Notification Guide).
3. After making a selection on the Phantom Power screen, the driver will display the following screen: 17
· Adjustment Level – Displays the input attenuation level (0db to -47dB). Selecting this circle allows attenuation level adjustment.
· Signal Level – When optimum Adjustment Level has been achieved, “Good” will display consistently (though peak levels may flash to “Low or “High”). Consistent display of “Low” or “High” means the level is incorrect and automatic gain control cannot operate.
Audio Time Delay
Selecting Audio Time Delay from Inputs opens the following screen:
In theatres, stadiums, and other large venues, sound sent from speakers will be impacted by the speed of sound, whereas audio sent through a hearing loop will reach a user instantly. This means the two sounds must be aligned or users will hear a constant echo. Select the screen’s circle to adjust syncing and compensate for latency.
Low Cut Filter
Selecting Low Cut Filter from Inputs opens the following screen:
This feature removes low frequency sounds from the hearing loop when background noise such as air conditioners might impact users. Select either 150Hz or 180Hz if required and a green `LCF’ (Low Cut Filter) symbol will be displayed on the left. 18
Guided Loop Setup
Guided Loop Setup ensures that hearing loops achieve optimum field strength,* ideal frequency response, and avoid clipping. Only begin Guided Loop Setup once the connected hearing loop cable has been laid in place and all relevant connections have been made (see page 12).
*This is dependant on correct loop design and metal loss.
Required for Setup
· FSM – Contacta Field Strength Meter (IL-CONTACTA-FSM) · Tripod or similar for mounting the FSM is recommended
Begin the Setup
Begin the Guided Loop Setup by selecting it from the driver’s main menu, and when prompted select “Yes” from the following screen:
For large area hearing loop cable installation instructions, consult Contacta’s Large Area Hearing Loop Installation Guide. Note: The guided loop setup will optimise the loop signal at the point used to take the measurement. Therefore, there may be variations in the signal coverage where no measurements have been taken and fed into the driver.
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Stage 1: High Frequency Compensation
High Frequency Compensation will be suggested by the driver when measurements in this section indicate metal in the surrounding environment impacts the hearing loop’s signal quality. 1. Select “Yes” when prompted by the following screen:
2. The driver will begin outputting a pink noise signal at a low level (1A on peaks) to allow accurate setup. The following screen will be displayed, with a symbol on the top right indicating “Signal On”:
3. Note the hearing loop’s field strength at 100Hz, 1KHz, and 5KHz using the Contacta Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave band pass setting. Once this is completed, select “Next” on the display to turn off the signal.
4. Enter the three levels into the hearing loop driver. The “Backspace” button will become a “Next” button when the correct number of digits have been entered for each value:
5. When the three levels have been entered, one of following options will be displayed (see next page):
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5a. If the values at 100Hz and 5KHz are within +/-3db of the value measured at 1KHz, this section is complete. Select “Next”:
5b. If the driver has calculated that High Frequency Compensation is required, it will ask whether to apply this correction. Selecting “Yes” is recommended.
5c. If the driver cannot provide ideal High Frequency Compensation, it will ask whether to apply the maximum adjustment available. Selecting “Yes” is recommended.
Stage 2: Loop Drive
1. Select “Yes” when prompted by the following screen:
The driver will begin outputting a 1KHz sinewave signal at a low level (2Arms) to allow accurate setup.
21
2. The following screen will be displayed, with a symbol on the top right indicating “Signal On”:
3. Note the hearing loop’s field strength at 1KHz using the Contacta Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave band pass setting. Once this value has been noted, select “Next” on the display to turn off the signal.
4. Enter the noted level into the hearing loop driver. 5. One of following three options will be displayed: 5a. If the driver has calculated the ideal peak current to achieve 0dB,
the following screen will appear and this section is complete. Select “Apply this level”:
5b. If the driver cannot deliver the current required to achieve 0dB it will display the following screen:
Select “Yes” when asked to apply the maximum unclipped current. 22
5c. If the ideal current is greater than is possible (due to the characteristics of the loop(s) connected being unsuitable to deliver maximum rated current without clipping at 1.6Kz), the maximum current will be attenuated and the maximum value will be displayed:
Select “Next”. The driver will make adjustments to achieve the strongest maximum field stength possible.
Stage 3: Loop Uniformity
1. Select “Yes” when prompted by the following screen:
The driver will begin outputting a 1Arms at 1KHz sinewave signal at a level below the calculated current required to hit 0dB field strength. 2. The following screen will be displayed, with a symbol on the top right indicating “Signal On”:
3. Record field strength at various locations in the hearing loop using the Contacta FSM set 1KHz 3rd octave band pass setting. These details will be required in Compliance Certificate documents. Then, select “Next”. 23
Stage 4: Completion
1. Select “Yes” when prompted by the following screen to complete the Guided Loop Setup to save settings:
24
Manual Loop Setup
Note: Most users will obtain the best performance from a V-Pro driver using the Guided Loop Setup. Manual setup mode can render an installation non-compliant with standards if done incorrectly. Enter this menu only if you are competent and qualified to proceed with Manual Loop Setup.
Begin Manual Loop Setup by selecting the option from the driver’s main menu. Note: For large area hearing loop cable installation instructions, consult Contacta’s Large Area Hearing Loop Installation Guide or design software suites.
Manual setup allows the selection of the following functions: · AGC Select: Enable or disable the Automatic Gain Control. · HFC Select: Set High Frequency Compensation (metal correction). · Set Drive Level: Set the Output Drive Level. · Test Sig Select: Enable the internal Test Signal Generator. · Output Phasing: Select non-standard output phasing (phased
drivers only). · Line Output: Set the level at the line output XLR jack.
AGC (Automatic Gain Control) Select
This screen allows automatic gain control to be disabled or enabled.
25
If the AGC is disabled the input gain may need to be adjusted on the Inputs setting screen. This is particularly the case if the input level is low in relation to the input gain and was previously being normalised by AGC. Note: If Guided Setup is subsequently used after Manual Setup, AGC will be automatically re-enabled.
HFC Select
This screen allows high-frequency compensation to be adjusted from 1 (weak) to 7 (strong).
HFC is required when metal in the surrounding environment impacts the hearing loop’s signal quality.
Set Drive Level
This screen allows the current in the primary loop to be adjusted.
The maximum current will be limited to the specified level for the driver, and no attempt should be made to exceed this. If the driver is a phased unit, it will be possible set the secondary output (bottom right of the screen). Note: Setting the driver to output currents in excess of the specified value will void the warranty. 26
If the driver is being set up from a remote device, increase the current gradually by clicking at the start of the level setting arc. Phased Drivers Only: Secondary Output This screen allows the current in the secondary loop in phased drivers to be adjusted.
In phased drivers it is important to set primary and secondary currents to similar values or the advantages of a phased system will be lost.
Test Sig Select
This screen allows the internal test signal generator to drive output stages.
The internal signal chain is driven at relatively low level, meaning this function is not intended for setting final output levels. However, levels of the signals at different frequencies are well matched, making the function suitable for frequency response testing. All selections other than “Off” will have the following additional effects on the driver: · The internal cooling fans will run up to full speed. · The normal input signal will be disconnected. · The loop continuity test signal will be disabled to allow accurate
current measurements.
27
Effects listed above will be cancelled when the TSG mode is set to “Off” or when Manual Setup mode is exited. The TSG signal will remain on while within the Manual Setup functionality unless manually switched off. This is to allow manual adjustment of HF compensation.
Output Phasing
This screen determines the phase relationship between the primary and secondary outputs on phased drivers.
In phased systems it is vital that the output phase relationship remains set to Standard Phasing. The driver will not act as a proper phased device in any other mode. There are two other phasing options: · “No Phasing” causes the two outputs to operate in phase with each
other. The driver is no longer phased in the manner required to produce uniform field coverage · “Sec Reverse” inverts the phase of the secondary output. This is the same as reversing the electrical connections to one (but not both) of the driver outputs of an un-phased driver.
28
Line Output
This screen sets the output level of the balanced line output XLR jack on the rear of the driver.
Note: Line Output Level should usually remain at 1.00 and only be reduced if advised by an educated installer. This output is not processed by the AGC to eliminate the possibility of “double AGC-ing” by devices further down the audio chain. The signal level is the sum of the signal at inputs A and B. This means that the gains of the two inputs must be set to give an adequate output level at the line output connector. The phase relationship between the Line output and the driver loop outputs is not guaranteed.
29
Diagnostics
Selecting Diagnostics from the main menu opens the following screen:
Loop
Selecting Loop from the Diagnostics menu opens the following screen:
· Loop inductance and resistance are values measured when the driver powers on.
· Hearing loop impedance at 1.6KHz (“z@1.6KHz) is calculated from the measured inductance and resistance.
· Maximum current is calculated from the driver voltage divided by the impedance at 1.6KHz.
· If impedance exceeds the limit the maximum current will be attenuated to prevent clipping.
30
Driver
Selecting Driver from the Diagnostics menu opens the following screen:
The following data in Driver is for information only: · Output enabled (Yes/No) · Heatsink temperature · Fan speed · Supply rail voltage
Counters
Selecting Counters from the Diagnostics menu opens the following screen:
Counters logs the number of times these events have occurred in the lifetime of the driver: · Power cycles – Power has been recycled. · Clipping – Voltage clipping has been detected. · Overtemp – Internal temperature has exceeded limits. · Overcurrent – Output current has exceeded limits. · Loop o/c – Open circuit loop(s) have been detected.
31
Service
Selecting Service from the main menu opens the following screen:
· Go to Idle Screen: The driver displays an idle screen. An unlock code will not be required to make adjustments/change settings.
· Go to Idle Screen + Lock: The driver displays an idle screen. An unlock code will be required to make adjustments/change to settings.
· Time out setting: Adjust the time before the driver displays an idle screen from between 0 (no return to idle screen) to 60 minutes. This is adjustable in 1-minute steps.
· Reboot Device: Restart the driver. Confirmation (Yes/No) is requested.
· Save settings to USB: The driver saves all user settings to a USB flash drive (see page 33).
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Save/Load Settings to USB Flash Drive
Automatic Saving Settings changed in the Guided Setup or Manual Loop Setup are updated once the user completes the setup. Completing the setup will return to the main menu screen where all settings are saved locally. USB Flash Drive – Saving and Loading 1. If a USB flash drive is connected to the driver, it will scan for a valid
save file. The save file name must match the driver’s model (V22a, V34, or V34a). 2. If a valid save file is located on the USB flash drive, the driver will ask if these settings should be loaded:
· Selecting “Yes” will load the file and overwrite settings saved on the driver, followed by a confirmation message:
· Selecting “No” will return the driver to the main menu. 3. To save settings to a USB flash drive, select “Save settings to USB”
from the service menu. If no previous save file is located on the USB flash drive, the driver will save current settings and display the following message:
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Selecting “Menu” will return to main menu. If a valid save file already exists on the USB flash drive, the following message will be displayed instead: · Selecting “Yes” will update the settings on the USB flash drive and display a message confirming that all settings have been saved. · Selecting “No” will return the driver to the main menu.
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System Updates
There are 2 types of system updates: · Software updates (see page 35) · Disk image updates (see page 36)
Software updates require the following 4 files to be placed in the root (top-level/default) directory of a USB connected to the driver: · pn1001-image-imx6ul-var-dart.ubi · pn1001-image-imx6ul-var-dart.ubi.sig · update.sh · update.sh.sig
Disk image updates requires the same 4 files as the software update and an 4 additional files (for a total of 8 files): · SPL-nand · SPL-nand.sig · u-boot.img-nand · u-boot.img-nand.sig
The average update (software or disk image) takes three minutes to both finish installation and restart the system. Note: Update related screens do not timeout to idle screens.
Software Updates – USB
Note: The driver software should be updated prior to installation. Drivers already connected to a hearing loop should not be updated as this may cause settings to alter.
Software updates can be run from a connected USB without any risk to the driver. If a USB is removed midway, the device will restart while maintaining the previously installed version of the software.
Generic V PRO software updates work for all drivers in the range. When a USB has been connected, relevant updates will be automatically completed for any model (V22a, V34, V34a) in the range.
1. To install a software update, connect a USB device which contains the required files.
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2. Select “Yes” when prompted by the following screen:
3a. If the USB’s files are valid, the driver will begin install the update before automatically restarting. The following screen will appear:
3b. If any of the USB’s files are not valid, the driver will display the following screen:
3c. If the above error message appears, ensure the USB drive contains only update files other files on the drive will prevent the update from occurring. We recommend using a formatted USB drive.
Disk Image Updates – USB
If the driver is low on memory, there will be a warning if a disk image update is attempted as the driver could be damaged if the USB is then removed mid-update. The user will be asked to confirm that they are aware of this risk. 1. To install a disk update, connect a USB device which contains the
required files. 2. Select “Yes” when prompted. 3. The driver will scan the USB’s files. 36
3a. If all files are valid, the driver will begin install the update and display this screen to the user before automatically restarting. The following screen will be displayed:
3b. If the USB’s files are not valid, the following screen will display:
3c. If the above error message appears, ensure the USB drive contains only update files other files on the drive will prevent the update from occurring. We recommend using a formatted USB drive.
Remote Monitoring
The driver’s user interface (settings screen) is accessed via a Local Area Network (LAN) connection and a browser on a laptop or smartphone. This allows easier adjustment of the driver on site during setup. Accessing remote monitoring 1. For browser access the IP address of the driver may be discovered
from the Remote Monitoring screen. To access this, select Remote Monitoring from the main menu to open the following screen:
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2. The driver’s IP address will be displayed. Enter this string of numbers into the browser of your laptop or smartphone to externally access the driver’s display. This screen also shows the MAC address and PIN number which are needed when registering the driver on the cloud dashboard.
3. Press “Connect” when prompted. 4. Enter “root” as the password when prompted.
Changing network settings
To change network settings, click “Settings” from the “remote monitoring” screen.
Here you can choose the IP address assignment method to be via DHCP or statically set. By default, DHCP is used.
To set an IP address manually, you will need the following information: IP address, Subnet Mask and Gateway. By clicking “Static” the driver will ask for this information. A Static IP address should only be assigned if the network IP address allocation is fully understood.
CAUTION: After adjusting any of the remote monitoring settings, always return to the main menu before powering off the device. Failure to do so may result in the catastrophic failure of the driver. This applies when changing the IP address assignment method to DHCP and Static, but not for only viewing the Device IP. Changing firewall settings
If a firewall is in use, ensure that port 80 on the firewall is open for outgoing connections from all IP addresses assigned to V PRO drivers on the network. Failure to do so will prevent the drivers from communicating with the Contacta dashboard servers. If you need assistance with opening port 80 or assigning IP addresses, please consult your network administrator or IT department
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Contacta Dashboard
The Contacta Dashboard is a platform that allows users to set up email alerts; these alerts will keep users informed about the status of their driver and inform them if any issues occur. The Contacta Dashboard also allows users to track the health of their V PRO drivers over the internet. All data is logged into the Contacta Dashboard cloud system which can then be viewed on any device. Settings of drivers can also be managed remotely; for example, where notification emails are sent to, and the recorded locations of the devices.
Getting Started
Using the system is a two-part process to get set up:
1. Register the device (once per device). 2. Register an installer account on the dashboard (one-time set up).
The first part is to register drivers on the logging platform. Do this once per device while installing the device on-site. Simply fill out a form which describes the client name, location, and contact details for notifications.
Then, register an account on the Contacta Dashboard platform. This is a one-time process to verify the installer email address and set up an account password.
After that, all new devices registered to that installer email will automatically be managed in the Contacta Dashboard account.
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Device Registration
1. Register a device during the on-site device installation process. During the setup of the device, you will be provided with: · The mac address of the device · A 4-digit access control pin number
2. Visit the Contacta Dashboard platform setup page: https://log.contactadashboard.com/login.php
3. Log in with your mac / validation number:
4. After logging in, complete the following form. Ensure that you are using the same installer email address on all devices that you wish to manage from the same dashboard account.
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5. A confirmation email will be sent to all email addresses you listed (installer, plus any customer notification email addresses used). Note: If a wrong email address is used, come back to this form at any time and re-register the device. This will overwrite the previously registered details.
7. Confirm with each recipient that the emails have been received and were not caught in spam filters. Ask any relevant email management companies to ensure emails from the Contacta address are whitelisted. If you have opted to send notifications to clients, pass this information on to them so that they can whitelist it.
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Account Registration
All registered drivers are managed at: https://www.contactadashboard.com/ 1. When accessing the Contacta Dashboard a login page will appear:
2. Click the “Register here” link below the login box. 3. Fill the form using the installer email address entered in the
previous device registration form (see page 40). 4. Once this form is completed, verify your email address. 5. A verification link will be sent to the installer email address. Click
the link to verify ownership of your email system. 6. Log in to the Contacta Dashboard platform.
Note: Your account will stay logged in until you log out. This makes it convenient for you to quickly get back into the dashboard and check on a device. To log out, use the button in the top right-hand corner of the dashboard. 42
Device Management
The following device summary page appears on the homepage of the Contacta Dashboard:
This page is divided into four sections:
·
The navigation menu down the left-hand side.
·
Four panels showing the device check in stats.
·
A list of recent events generated by your devices.
·
The account information in the top right.
The navigation menu lets you access all of the features of the site.
On small screens this may be hidden by default. Tap the menu button to expand it:
The first option is the Device Summary page (the home page):
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The second icon displays all registered devices:
The third icon allows fast navigation to device settings pages:
The fourth icon provides detailed device history, temperature and health information:
Device Check-In Stats At the top of the main page is an overview of all devices registered on the system:
A device is classed as offline if it hasn’t logged information into the cloud for more than 1 hour. If you see red notices in the “Offline Devices” section noting drivers that should be online, any relevant hearing loop drivers must be assessed in person.
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Recent device events
Recent device events lists any recent activity of registered drivers. Registered devices The registered devices page lists all devices registered to the current installer email account.
Filter devices using the filter function in the header of the table. Within the “type to filter devices…” text box, simply type any identifying characteristic of the device. For example, based on the screenshot above, typing “soka” would filter to all devices registered to the client “SOKA Studio”; or instead,
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filter a certain site by typing something like “head office”. Data can also be matched from the driver location, driver zone and model columns. If the device is currently in a fault or caution error state, then the row will be highlighted in red or amber. The last column has two shortcut buttons which will navigate you to the pages described in the next section:
· The left icon takes you to the device settings page. · The right icon takes you to the device history page. Device Settings The device settings page shows the device info in the top panel. These are fixed fields which were specified at the devices registration and do not change. The second panel contains the device settings. Manage the client and device location details here, plus set up the email addresses that any alerts are sent to. To add multiple emails into the email notifications field, type an email address followed by a space. To remove an email address click the grey x on the right of each email tag.
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To make changes to this section simply type the new details into the page, then scroll to the bottom of the page, and press the Update Settings button:
Note: If you want to completely disable email alerts for a device you can do a combination removing all of the email tags in this screen and then setting the “Send Alerts To” field to “Client”. Delete Device To remove a device from your account, access the device settings page. This action cannot be undone. If you delete the device then need to register it again, perform a new registration process as explained on page 42.
Clicking the “DELETE DEVICE” button will display a dialogue box:
Confirm the deletion by pressing “DELETE DEVICE”. The device will then be permanently removed from your account.
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Device History The device history page shows the entire history of that device. This includes a panel at the top which shows the information that you have configured inside the device settings page:
There is also a button to navigate back to the Device Settings page. Just click Edit Device to make changes to that device. Further down a graph of its temperature if the device has been active in the last 24 hours:
The next part of the page is the Device Health section. If there are any issues with the device such as it heating up past the recommended threshold temperatures, it loosing contact with the loop, or the device resetting, you will see these events in this table:
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The device health comprises of 3 columns. Event Date is when the device health event was logged. The type is the internal error code that was generated. This is a bit technical so next to it you will also find a Summary column which explains what the issue is and gives some more information about the parameters which triggered it. The last table on this page is the Activity Log. The device sends a full diagnostic log to the cloud multiple times per hour. Each logged activity entry for devices can be found here. A selection of the most useful fields have been added as columns along the table.
If a column with two values is separated by a slash, this is a phased device. The left is the primary and the right is the secondary values. On the right hand side there is a details button:
Because the device logs a large amount of diagnostic data per-event, it would not all fit in on this summary table.
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Click this button to see a detailed table of every item which has been submitted:
Scroll this window down to see more entries on the table.
Use the X in the top right-hand corner to close this dialogue box or simply click outside of the dialogue box. If one of these activity log events has report device health issues then the row will be highlighted, and the details will be listed in the error column:
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Troubleshooting
Symptom Driver does not turn on. Interference (buzzing/ whistling/hissing) is heard through induction loop.
Driver is excessively hot to touch.
Loop output level indicates current is flowing but I hear nothing in the loop.
Sound is distorted.
Audio from the hearing loop driver is clipping.
Possible Fault
Action
1) Mains power is absent.
1) Check mains power.
2) Internal issue. 1) Poor input signals.
2) Seek assistance.
1) Power off the hearing loop driver and confirm that interference isn’t from external origin.
2) Internal issue.
2) Disconnect input signals. If sound disappears, check inputs.
1) Large amount of mains hum 1) Check input signal source. present on input.
2) Internal issue. 1) Shorted feeder cable.
2) Incorrect hearing loop driver being used.
1) Check feeder cable, although the hearing loop driver will usually refuse to tune to shorted feeder.
2) Loop listener is not
2) Check listener and location.
working or being used too far
from loop.
1) Input level has been turned up too high for signal level at input.
1) Reduce input level setting.
2) Input signal is distorted.
2) Check signal source.
3) Output signal is clipping.
The connected hearing loop cable is too long.
3) Refer to “The Clipping Status Lights are lit” below.
1) Reduce the length of the hearing loop cable.
2) Use a larger diameter cable.
3) Create a two-turn loop.
4) Use a higher voltage driver.
Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.
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s
Notification Guide
!
AB A
B
LCF
ATTN
Signal On
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Loop Resistance
If you encounter the above fault message indicating an issue with the loop, follow the steps outlined below for effective diagnosis and resolution. Step 1 Reset the mains power. If the error message reappears, proceed to step 2. Step 2 1. Disconnect both the power and the hearing loop(s). 2. Use a multi-meter to measure the resistance of the loop. 3. Measure the resistance at the NL4 connector, specifically between
the conductors used: either 1a – 1b or 2a – 2b. 4. Ensure that the resistance readings are below the specified values:
· V22A: Less than 40 · V34: Less than 64 · V34a: Less than 64 5. If the loop resistance exceeds the aforementioned values but isn’t an open circuit, consider the following possibilities: a. The loop, including the feeder cable, surpasses the maximum
allowable resistance due to excessive length, inadequate gauge size, or a combination of both. Investigate the underlying
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cause(s) for this.
b. If the reading indicates an open circuit, it’s likely that there’s a physical break in the loop or feeder cable. Investigate and identify the cause of this.
If the loop resistance falls within the specified values (typically less than half these values), the issue could stem from the loop being inadvertently connected to mains or building ground (Earth).
Step 3
1. With the mains power disconnected, detach the loop connector.
2. Set the multi-meter to Megaohms (M) and measure the resistance of the loop connections and a suitable ground/earth connection. This can include the chassis of an earthed electrical equipment, exposed metal pipes (water or gas), or conduit.
3. Ensure that the measured resistance is greater than 10M. Take care not to touch the meter connections while measuring, as this can impact the accuracy of the reading.
4a. If the reading exceeds 10M or the meter indicates an open circuit (O/C) for V22a or V34a, proceed to step 4. For a V34 issue, it’s recommended to seek guidance from your supplier or installer.
4b. If the measured reading is below 10M, there may indicate a serious fault with the loop insulation.. Extremely low readings could indicate a significant fault with the loop insulation.
Before proceeding, address any concerns related to loop insulation.
Step 4
1. Set your multi-meter to the Megaohms (M) range. Take care not to touch the meter connections during measurement, as this could influence the reading.
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2. Measure the resistance between both loops using the multi-meter. The measured resistance should exceed 10M.
3. If the measured resistance falls below 10M, investigate the insulation of the loop/feeder cable and inspect the points where the loops come into physical contact with each other.
4. If the measured resistance is higher than 10M or the meter shows an open circuit (O/C), it’s recommended to get in touch with your supplier or installer for support.
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Technical Specification
V22a:
Technical Data
Audio Inputs
2 X line/microphone inputs (switchable) XLR or Euroblock
Line (optimised for -10dBV to 0dBv)
Microphone (12V phantom power via 680 optimised for levels above -45dBv)
Outputs Voltage Loop Outputs Output Current
2 x 22.66Vrms (64.09V pk-pk)
2 x 8Arms @ 1KHz (22.62A pk-pk) >1200 seconds (20 minutes)
Loop Connector
2 x NL4
Frequency Response Distortion
100Hz to 9KHz
THD<1% (-40dB) full current both channels driven
Audio System
Automatic Gain Control
High Frequency Compensation
DSP controlled, peak detecting 7 DSP controlled, optimised stages
Audio Signal Delay
10ms to 40ms
Display
Backlit TFT 480 x 128 pixels (95mm x 25mm)
Control
Single Rotary Push Control
Mains Input
Voltage Frequency
100V-120V /200V-240V AC (universal auto switching with PFC)
50Hz/60Hz
Connection
IEC
Cooling
Custom heatsink with temperature-controlled fan
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Technical Specification
V34:
Technical Data
Audio Inputs
2 X line/microphone inputs (switchable) XLR or Euroblock
Line (optimised for -10dBV to 0dBv)
Microphone (12V phantom power via 680 optimised for levels above -45dBv)
Outputs Voltage Loop Outputs Output Current
34Vrms (96.1V pk-pk)
12Arms @ 1KHz (33.94A) pk-pk >1200 seconds (20 minutes)
Loop Connector
NL4
Frequency Response Distortion
100Hz to 9KHz
THD<1% (-40dB) full current both channels driven
Audio System
Automatic Gain Control
High Frequency Compensation
DSP controlled, peak detecting 7 DSP controlled, optimised stages
Audio Signal Delay
10ms to 40ms
Display
Backlit TFT 480 x 128 pixels (95mm x 25mm)
Control
Single Rotary Push Control
Mains Input
Voltage Frequency
100V-120V /200V-240V AC (universal auto switching with PFC)
50Hz/60Hz
Connection
IEC
Cooling
Custom heatsink with temperature-controlled fan
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Technical Specification
V34a:
Technical Data
Audio Inputs
2 X line/microphone inputs (switchable) XLR or Euroblock
Line (optimised for -10dBV to 0dBv)
Microphone (12V phantom power via 680 optimised for levels above -45dBv)
Outputs Voltage Loop Outputs Output Current
2 x 34Vrms (96.1V pk-pk)
2 x 12Arms @ 1KHz (33.94A) pk-pk >1200 seconds (20 minutes)
Loop Connector
2 x NL4
Frequency Response Distortion
100Hz to 9KHz
THD<1% (-40dB) full current both channels driven
Audio System
Automatic Gain Control
High Frequency Compensation
DSP controlled, peak detecting 7 DSP controlled, optimised stages
Audio Signal Delay
10ms to 40ms
Display
Backlit TFT 480 x 128 pixels (95mm x 25mm)
Control
Single Rotary Push Control
Mains Input
Voltage Frequency
100V-120V /200V-240V AC (universal auto switching with PFC)
50Hz/60Hz
Connection
IEC
Cooling
Custom heatsink with temperature-controlled fan
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Standards
EMC · BS EN 55103-1: 2009 (EMC emissions) · BS EN 55103-2: 2009 (EMC immunity) This product has been designed and tested to comply with the following North American and Canadian standards: · FCC class “B” EMC (emissions) · ICES-003
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION: Changes or modifications not expressly approved by Contacta Systems LTD or an authorised partner could void the user’s authority to operate the equipment.
Correct disposal of this product This marking indicates that this product should not be disposed with other household waste throughout the EU. To prevent possible harm to the environment or human health from uncontrolled waste disposal and to conserve material resources, this product should be recycled responsibly. To dispose of your product, please use your local return and collection systems or contact the retailer where the product was purchased.
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Local dealer:
UK & ROW +44 (0) 1732 223900 sales@contacta.co.uk
www.contacta.co.uk
US & Canada +1 616 392 3400 info@contactainc.com
www.contactainc.com
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Documents / Resources
 |
contacta V34a Hearing Loop Drivers [pdf] User Guide V22a, V34, V34a, V34a Hearing Loop Drivers, Hearing Loop Drivers, Loop Drivers, Drivers |