contacta V22 Series Hearing Loop Driver User Guide

Product Overview

Our highly efficient V22 hearing loop driver is built around high-end technology designed for the flagship V Series PRO hearing loop driver range. It is suitable for driving the most demanding perimeter loop systems in medium to large venues.

With a Class-D amplifier output stage, the V22 delivers a high enough current to drive even the toughest loop loads.

The audio subsystem is built around an advanced DSP core. Combined with a microprocessor control that ensures peak performance, the driver uses cutting edge technology to deliver peak performance.

Note: For large area hearing loop installation instructions, consult the Large Area Hearing Loop Installation Guide.

Components

1. Rubber Feet x 4
2. 2-way 3.5mm Euro-Block Connector x 2
3. 3-way 3.5mm Euro-Block Connectors x3
4. 4-way Terminal Block
5. Hearing Loop Stickers
6. V22 Hearing Loop Driver
7. User Guide
8. IEC Power Lead*
9. Rack Mounting Ears
10. Compliance Certificate

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 ancillary equipment for audio feeds, such as a microphone or sound system.

Connections

1. Power Supply Input*
   
2. Factory Use (no user input)
   
3. Line Input – 3.5mm Euro-block balanced line input
   
4. 100V Line Input – 3.5mm Euro-block transformer isolated & balanced
   
5. MP3 (Line Level Input) – 3.5mm Euro-block transformer isolated & balanced
   
6. Line/Microphone – 3.5mm Euro-block – switchable phantom power (12V)
   
7. Line Output – 3.5mm Euro-block**
   
   
8. Loop Output – 5.08mm 4-way terminal block
   

* Power Sources – This product should be operated only from the type of power source indicated on the marking label. If you are not sure of the type of power supply to your home, consult your product dealer or local power company.

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.

**Line Output – The Line Output on the V22 allows further V22s to be “chained” from the first V22. It will feed the Line Input [3] on the next V22 and is a simple mix of the two inputs to which the driver time delay (see page 18), if used, has been applied. This means that the time delays of a chain of V22s is cumulative and may be adjusted to suit large auditoriums.

The Line Output is not processed by the V22’s Automatic Gain Control (see page 14). The AGC, if used, is only applied to the Loop Output [8]. This prevents the drivers’ Line Outputs from cascading multiple AGC stages down the chain. It is therefore important to set the input gain on each V22 in the chain to maintain the level in the chain. The Line Output is not phased and cannot be used to create phased pairs of V22s.

Connection Examples

Balanced Inputs 

MP3 Connections

Suitable Cable Lengths

The tables in this section show the approximate maximum cable lengths for differing maximum required currents to achieve a 400mA/m field strength.

Loop impedance (at 1.6kHz) should be less than voltage capability of the driver (22V) divided by the required current.

The minimum loop resistance (DCR) is 0.25Ω.

V22 Single-Turn (Metric) 

Current

1A

2A

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

Impedance

22.6W

11.3W

7.53W

5.65W

4.52W

3.77W

3.23W

2.83W

2.51W

2.26W

2.05W

1.88W

Cable Type

Cable Length

Max. Cable Length

Round Cable (AWG)

1.5mm

970.99m

485.50m

323.66m

242.75m

194.20m

161.83m

138.71m

121.37m

107.89m

97.10m

88.27m

80.92m

2.5mm

1091.74m

545.87m

363.91m

272.94m

218.35m

181.96m

155.96m

136.47m

121.30m

109.17m

99.25m

90.98m

Flat Cable (Width)

10mm

614.41m

307.21m

204.80m

153.60m

122.88m

102.40m

87.77m

76.80m

68.27m

61.44m

55.86m

51.20m

12.5mm

1161.97m

580.99m

387.32m

290.49m

232.39m

193.66m

166.00m

145.25m

129.11m

116.20m

105.63m

96.83m

25mm

1538.27m

769.13m

512.76m

384.57m

307.65m

256.38m

219.75m

192.28m

170.92m

153.83m

139.84m

128.19m

V22 Single-Turn (Imperial) 

Current

1A

2A

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

Impedance

22.6W

11.3W

7.53W

5.65W

4.52W

3.77W

3.23W

2.83W

2.51W

2.26W

2.05W

1.88W

Cable Type

Cable Length

Max. Cable Length

Round Cable (AWG)

18AWG

2552.86ft

1276.43ft

850.95ft

638.21ft

510.57ft

425.48ft

364.69ft

319.11ft

283.65ft

255.29ft

232.08ft

212.74ft

14AWG

3408.47ft

1704.23ft

1136.16ft

852.12ft

681.69ft

568.08ft

486.92ft

426.06ft

378.72ft

340.85ft

309.86ft

284.04ft

Flat Cable (Width)

18AWG (equiv.)

2871.76ft

1435.88ft

957.25ft

717.94ft

574.35ft

478.63ft

410.25ft

358.97ft

319.08ft

287.18ft

261.07ft

239.31ft

14AWG (equiv.)

4538.17ft

2269.08ft

1512.72ft

1134.54ft

907.63ft

756.36ft

648.31ft

567.27ft

504.24ft

453.82ft

412.56ft

378.18ft

V22 Double-Turn Hearing Loop (Metric) 

Current

1A

2A

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

Impedance

22.6W

11.3W

7.53W

5.65W

4.52W

3.77W

3.23W

2.83W

2.51W

2.26W

2.05W

1.88W

Cable Type

Cable Length

Max. Cable Length

Round Cable (AWG)

1.5mm

650.61m

325.31m

216.87m

162.65m

130.12m

108.44m

92.94m

81.33m

72.29m

65.06m

59.15m

54.22m

2.5mm

683.46m

341.73m

227.82m

170.87m

136.69m

113.91m

97.64m

85.43m

75.94m

68.35m

62.13m

56.96m

Flat Cable (Width)

10mm

537.58m

268.79m

179.19m

134.39m

107.52m

89.60m

76.80m

67.20m

59.73m

53.76m

48.87m

44.80m

12.5mm

831.19m

415.60m

277.06m

207.80m

166.24m

138.53m

118.74m

103.90m

92.35m

83.12m

75.56m

69.27m

25mm

984.36m

492.18m

328.12m

246.09m

196.87m

164.06m

140.62m

123.05m

109.37m

98.44m

89.49m

82.03m

V22 Double-Turn Hearing Loop (Imperial) 

Current

1A

2A

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

Impedance

22.6W

11.3W

7.53W

5.65W

4.52W

3.77W

3.23W

2.83W

2.51W

2.26W

2.05W

1.88W

Cable Type

Cable Length

Max. Cable Length

Round Cable (AWG)

18AWG

1864.96ft

932.48ft

621.65ft

466.24ft

372.99ft

310.83ft

266.42ft

233.12ft

207.22ft

186.50ft

169.54ft

155.41ft

14AWG

2131.29ft

1065.65ft

710.43ft

532.82ft

426.26ft

355.22ft

304.47ft

266.41ft

236.81ft

213.13ft

193.75ft

177.61ft

Flat Cable (Width)

18AWG (equiv.)

2254.91ft

1127.45ft

751.64ft

563.73ft

450.98ft

375.82ft

322.13ft

281.86ft

250.55ft

225.49ft

204.99ft

187.91ft

14AWG (equiv.)

2958.49ft

1479.24ft

986.16ft

739.62ft

591.70ft

493.08ft

422.64ft

369.81ft

328.72ft

295.85ft

268.95ft

246.54ft

Driver Area Coverage

Note: A full site survey of an installation area is recommended for optimal loop design.

Areas detailed in the table below 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)

Voltage	Current
22V	12A

Area
1:1	1:2	1:3
715.0sqm	899.0sqm	961.0sqm
7692.0sqft 9	9672.0sqft	10338.0sqft

Controls

Front Panel Overview 

1. Clip Status Light – When lit, this status LED indicates the signal on the hearing loop output is clipping (see Troubleshooting on page 26 for appropriate solutions).
2. Open Circuit Loop – Indicates the status of the Loop integrity
3. Display Screen – Indicates the status of the Loop Output, displays menu and adjustment options.
4. Control Dial – Used for unlocking and making adjustments.

Start-Up Sequence

When power is applied the hearing loop driver will automatically perform an analysis of the loop connected to the output.

When the analysis is complete, the following screen should display:

Rotating or pressing the control will display the unlock screen.

Should an error occur during start up, please consult warning and error messages page 26.

Locking/Unlocking the Hearing Loop Driver

The hearing loop driver will power up in Output Current Display Mode and will be locked from entering Adjustment Mode.

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:
   • Rotate the control clockwise to select the first required digit.
   • Press the control dial in to select the digit.
   • Repeat steps (a) and (b) until all the digits have been selected.

Note: Entering the wrong code returns the driver to the lock screen.

Modes

Main Menu 

After being unlocked, the hearing loop driver will display the main menu. This is indicated by up and down arrow on the display screen.

When in this mode, rotating the hearing loop driver’s control dial clockwise will move the screen to the next menu item and rotating the dial anti-clockwise will move it to the previous menu item.

The menu options are as follows:

1. Loop Output
2. Loop Drive Set
3. AGC On/Off
4. Input A Level
5. Input B Level
6. Phantom Power Input B
7. High-Frequency Compensation
8. Input High Pass Filter
9. Acoustic Delay
10. Backlight Timeout
11. Diagnostics

Adjustment Mode 

Press the control dial in to enter Adjustment Mode; the arrows on the display screen will move to a left and right position. Rotate the dial clockwise or anti-clockwise to make the adjustment. Press the control dial in to confirm the selection and return to the main menu.

If the control dial is not used for 120 seconds when in Adjustment Mode the hearing loop driver will revert to the main menu, with Loop Output as the default screen.

Locking/Rebooting the Unit 

To lock the V22 when not in adjustment mode, press and hold the control dial for 5 seconds.

If an error message is displayed, reboot the driver by pressing and holding the control dial for 5 seconds.

Loop Output

The hearing loop driver’s Loop Output section displays the real-time output current, both graphically in 1A steps and numerically in 0.1A steps.

Loop Drive Set 

The hearing loop driver’s Loop Drive Set section displays the real-time output current in 1A steps.

Adjustments

In Adjustment Mode, the real-time current is displayed on the top line in 1A steps. The bottom line indicates the strength of the loop output level adjustment.

• To increase the loop output level, rotate the control dial clockwise.
• To decrease the loop output level, rotate the control dial anti-clockwise.
• Press the control dial once to confirm the selection and return to the Loop Drive Set menu.

AGC On/Off

The AGC function can be switched on or off from this screen. For normal set-up and operation and optimal performance it is recommended the AGC is left on.

Adjustments

Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the AGC on or off. Press the control dial once to confirm the selection and return to the main menu.

Input A Level

Input A/Isolated can be adjusted over a range of 47dB. The text on the display indicates if the correct line level has been achieved:

• “Low” indicates the line level is too low for the automatic gain control to operate.
• “Good” indicates the level is at an optimum level for the automatic gain control to operate.
• “High” indicates the level is too high and signal clipping may occur. Signal clipping will also be shown by the LED

Adjustments

Enter Adjustment Mode and alter the level displayed on the bar until the text displays ‘Good’. It is recommended that at least 5 blocks in the adjustment block are filled.

• To increase the input level, rotate the control dial clockwise.
• To decrease the input level, rotate the control dial anti-clockwise.
• Press the control dial once to confirm the selection and return to the main menu.

Input B Level

Input B can be used for either line level or microphone level signals and can be adjusted over a range of 47dB.

The top line of the display indicates if the correct microphone input level has been achieved:

• “Low” indicates the level is too low for the automatic gain control to operate.
• “Good” indicates the level is at an optimum level for the automatic gain control to operate.
• “High” indicates the level is too high and signal clipping may occur. Signal clipping will also be shown by the LED.

Adjustments

Enter Adjustment Mode and alter input level displayed on the bar until the text displays ‘Good’. It is recommended that at least 5 blocks in the adjustment block are filled.

• To increase the input level, rotate the control dial clockwise.
• To decrease the input level, rotate the control dial anti-clockwise.
• Press the control dial once to confirm the selection and return to the main menu.

Phantom Power Input B

Phantom power for a connected microphone is set off as the default setting. If required by the connected microphone, enable phantom power.

Adjustments

Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the phantom power on or off. Press the control dial once to confirm the selection.

High-Frequency Compensation

There are 7 levels of high-frequency compensation available to adjust for metal loss. Your hearing loop driver will have high-frequency compensation turned to the lowest setting as its default.

Adjustments

To alter the high-frequency compensation level, enter Adjustment Mode:

• To increase the high-frequency compensation level, rotate the control dial clockwise.
• To decrease the high-frequency compensation level, rotate the control dial anti-clockwise.
• Press the control dial once to confirm the selection and return to the main menu.

Input High Pass Filter

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.

Adjustments

Rotating the control dial clockwise or anti-clockwise in Adjustment Mode to toggle between the 150Hz and 180Hz cut-off or turn the filter off. Press the to dial once to confirm the selection and return to the main menu.

Acoustic Delay

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.

Adjustments

Alter syncing and compensate for latency.

• To increase the delay, rotate the control dial clockwise.
• To decrease the delay, rotate the control dial anti-clockwise.
• Press the control dial once to confirm the selection and return to the main menu.

Backlight Timeout

Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the screen’s backlight on or off. Press the control dial once to confirm the selection.

Diagnostics

This screen displays the connected loop’s resistance (R ohms) and loop Inductance (L uH).

Rotating the control dial clockwise displays the internal heatsink temperature and fan PWM (100% is fan full speed):

Rotating the control dial clockwise again displays the internal power supply voltages:

Rotating the control dial clockwise again displays the UID unique identification for the driver.

Hearing Loop Setup

Warning: Ensure the AGC setting is on before proceeding. To ensure optimal performance, setup should be performed in following order:

Required for Setup

• TSG – Contacta Test Signal Generator (TSG1)
• FSM – Contacta Field Strength Meter (IL-CONTACTA-FSM)
• Tripod or similar for mounting the FSM is recommended
• ‘Compliance Certificate’ document

Note

Throughout set-up, record values on the provided Compliance Certificate document whenever you see the following icon:

The Compliance Certificate document confirms compliance with IEC-60118:4 if your values are within acceptable levels.

It is highly recommended that you retain a copy of the completed Compliance Certificate document for your records and provide a copy to the relevant facilities manager.

Step 1: Background Noise Level

This test should be performed prior to loop installation.

1. Set up the FSM, ensuring that the two vertical arrows in the top-right corner of the device are placed at the correct height:
   • 1.2 metres (3’ 9”) for seated user.
   • .7 metres (5’ 6”) for standing users. A tripod or similar for mounting the FSM is recommended.
2. Any lights or equipment normally active in the surrounding area should be turned on to ensure an accurate testing environment.
3. Set the FSM to the Background Noise mode – “A-weighted”.
4. Measure and note the background noise level throughout the looped area on the Compliance Certificate document.
5. Listen to the loop through the FSM (A-weighted) or a loop listener (A-weighted). Note and demonstrate any interference to the customer which may not be heard through a hearing instrument.
6. Background magnetic noise should ideally be between -32dB and -60dB. If the readings noted pass the Compliance Certificate document’s requirements, move on to Step 2: Metal Loss.

Step 2: Metal Loss

1. Set up the FSM, ensuring that the two vertical arrows in the top-right corner of the device are placed at the correct height:
   • 1.2 metres (3’ 9”) for seated user.
   • 1.7 metres (5’ 6”) for standing users.
     A tripod or similar for mounting the FSM is recommended.
2. Connect the TSG to the line input of the hearing loop driver.
3. Set the TSG to the 1kHz setting.
4. Set the FSM to the Third Octave F= 1000Hz setting.
5. Adjust the line level until “Good” is displayed.
6. Adjust the drive level to achieve 2 amps of output current.
7. Set the TSG to the pink noise setting and record the value measured by the FSM.
8. Set the FSM to the Third Octave F= 100Hz setting and record the value measured.
9. Set the FSM to the Third Octave F= 5000Hz setting and record the value measured.
10. If the difference between the values measured at 1000Hz and 5000Hz is less than 3dB, record the results and move on to
    Step 3: Output Level and Clipping. If the difference is higher than 3dB, move on to step 11.
11. Increase the HF comp and repeat steps 3 to 10.

Step 3: Output Level and Clipping

Note: This test should be performed as briefly as possible.

1. Set the TSG to the 1kHz setting.
2. Set the FSM to the RMS/Peak A-Weighted mode.
3. Adjust the drive level to achieve 2 amps of output current.
4. Measure the field strength. Achieve 0dB by using the FSM’s indicated field strength to work out the extra current required. For example: if the measured field strength on the FSM is (A-RMS) -6dB then 6dB (2X) extra current will be required to achieve 0dB (see Note 1 on page 24).
   Note: If more than 15.5dB is required to achieve 0dB, a different loop design or more powerful driver is required. This is potentially due to metal loss.
5. Briefly alter the current to the desired level. For instance, the example in step 4 requires 4 amps of current.
6. The field strength will now be 0dB +/- 1dB.
7. Quickly record the current required to achieve 0dB field strength. Now switch the TSG to 1.6kHz.
8. Confirm that the Clip LED remains unlit.
9. If the driver’s front panel Clip LED remains unlit, return the TSG to 1kHz and reduce output current to 2 amps move on to Step 4: Field Uniformity

If the driver’s front panel Clip LED is lit, the driver is clipping. This means the loop connected is too long, and therefore:

1. The system is not IEC60118-4 compliant
2. The sound will be distorted
3. The driver may be susceptible to damage and warranty voided

Perform one of the following solutions and repeat until there is no clipping:

1. Reduce the loop current
2. Reduce the length of the loop
3. Use a heavier gauge of cable
4. Try a two-turn loop
5. Use a higher voltage driver

Step 4: Field Uniformity

1. Set up the FSM. Ensure that the two vertical arrows in the top-right corner of the FSM are placed at the correct height:
   • 1.2 metres (3’ 9”) for seated user.
   • 1.7 metres (5’ 6”) for standing users.
     A tripod or similar for mounting the FSM is recommended.
2. . Reduce the loop output current to 2 amps.
3. Set the FSM to the RMS/Peak A-Weighted mode and record the value measured by the FSM in the centre of the loop.
4. Move the FSM to other positions within the looped area and record the values measured by the FSM.
5. The differences measured in other positions should not be greater than +/- 3dB of that measured in the first position.
6. Repeat steps 3 to 5 to create a suitable map of the area looped.

Step 5: Final Output Level Adjustment

1. Set the TSG to 1kHz.
2. Adjust the output current to the level recorded in Step 3: Output Level and Clipping (7) on page 22. Once the current is set, disconnect the TSG.

Step 6: Input Signal Level Adjustment

1. Connect the system signal source.
2. Adjust the input level (line/mic) level until “Good” is displayed on audio peaks.
3. The system is now set up.

Note 1:

When adjusting the output current, if a level of 6 amps is reached and yet the field strength is still below -6dB, the correct field strength will not be achieved.

This is caused by either an incorrect loop design or installation, more metal loss than expected or an incorrectly specified driver.

There is no need to go higher than +0dB ARMS.

Adjustment to drive current/level required based on the measured field strength:

Measured Field Strength	Output current that will achieve 0dB
6.00dB	1.00A
5.00dB	1.12A
4.00dB	1.26A
3.00dB	1.42A
2.00dB	1.59A
1.00dB	1.78A
.00dB	2.00A
-1.00dB	2.24A
-2.00dB	2.52A
-3.00dB	2.83A
-4.00dB	3.17A
-5.00dB	3.56A
-6.00dB	3.99A
-7.00dB	4.48A
-8.00dB	5.02A
-9.00dB	5.64A
-10.00dB	6.32A
-11.00dB	7.10A
-12.00dB	7.96A
-13.00dB	8.93A
-14.00dB	10.02A
-15.00dB	11.25A

Troubleshooting

Symptom	Possible Fault	Action
The driver does not turn on.	Mains power is absent.  Internal failure.	Check mains power. Seek assistance.
Interference (buzzing/ whistling/hissing) is heard through induction loop.	Bad input signals. Internal failure.	Power off the hearing loop driver and confirm that interference isn’t from external origin. Disconnect input signals. If sound disappears, check inputs.
The driver is excessively hot to touch.	Large amount of mains hum present on input. Internal failure.	Check input signal source. Incorrect hearing loop driver being used.
The loop output level indicates current is flowing but I hear nothing in the loop.	Shorted feeder cable. Loop listener is not working or being used too far from loop.	Check feeder cable, although the hearing loop driver will usually refuse to tune to shorted feeder. Check listener and location.
The sound is distorted.	Input level has been turned up too high for signal level at input.  Input signal is distorted.  Output signal is clipping.	Reduce input level setting. Check signal source. Refer to “The Clipping Status Lights are lit” below.
Clipping Status Lights are lit.	The connected hearing loop is too long.	Reduce the length of the loop.  Use a larger diameter cable.  Create a two-turn loop and reduce the current output. Use a higher voltage driver.

Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.

Warning / Error Messages

When power is applied, the hearing loop driver will automatically perform an analysis of the loop connected to the output.

The following messages indicate an error has been detected:

Main PSU Fault

This message indicates an error with the main internal power supply.

The mains power should be recycled, or a reboot initiated. If the warning still appears, disconnect the power supply and contact your distributor (or Contacta if appropriate).

Aux PSU Fault

This message indicates an error with the auxiliary power supply.

The mains power should be recycled or a reboot initiated. If the warning still appears, disconnect the power supply and contact your distributor (or Contacta if appropriate).

Loop Open or High Res

This message indicates that the loop connected is either open circuit (not connected) or is very high resistance.

The power should be removed, and loop and feeder cables should be checked with an ohmmeter to confirm continuity (too long/small gauge).

Impedance Error

This message indicates that the loop connected has characteristics that are not expected with typical loops.

The mains power should be removed, or the unit rebooted. Then, check the loop and feeder cables. Contact your distributor (or Contacta if appropriate) if the error persists.

Loop Fault

This indicates the driver has detected a general fault with the output.

This message can be displayed during start up or during operation. Contact your distributor (or Contacta if appropriate) if the error persists.

Loop Open

During normal operation, this message indicates that the loop is open circuit; the Open Circuit Loop led on the front panel will also be lit

The mains power should be removed. Then, check the loop and feeder cables. Contact your distributor (or Contacta if appropriate) if the error persists.

Loop Short or Low R 

This indicates the driver has detected that either the loop connected has a very low resistance (<0.25Ω) or there is a short circuit on the output.

This message can be displayed during start up. If displayed, remove the power and check the loop.

Low resistance can be caused by a loop that is too short or is using a heavy gauge of cable. There may also be a short between conductors at the end of a feeder cable.

Contact your distributor (or Contacta if appropriate) if the error persists.

Technical Specification

Power

• Voltage: 100V-120V /200V-240V AC (Universal auto switching)
• Frequency: 50Hz-60Hz
• Power: 175W
• Connection: IEC

Inputs

• 1 X Input A 3.5mm Euro-block [optimised for -10dBV to 0dBv]
• 1 X 100V Line Input (Transformer isolated) 3.5mm Euro-block
• 1 X MP3 Input (Line level, transformer isolated) 3.5mm Euro-block
• 1 X Input B Line/Microphone (12V phantom power via 680Ω) [optimised for levels above -45dBv to -10dBv] 3.5mm Euro-block

Output Characteristics 

• Output Voltage: 22Vrms (62.04Vpk-pk) @ 12Arms (33.84Apk-pk) see notes 1 and 2
• Output Current: 12Arms (33.84Apk-pk) up to 300 seconds
• Loop Connector: 4 Way 5.08mm Euro block
• Induction loop performance compliant with BS EN60118-4 (when correctly installed)

Audio system 

• Frequency Response: 80Hz to 9kHz
• Distortion: THD+N <1% (-40dB)
• AGC: Switchable (Peak detecting)
• HF Comp: 7 optimised stages
• Acoustic Time Delay 10ms to 70ms adjustable in 1ms steps
• Low cut filter Selectable 150Hz or 180Hz

Display & Control 

• Display: LED Backlit LCD display
• Control: Single rotary control

Fault Monitoring and Protection

• Main Display: Open circuit loop (DCR measurement)
• Loop ground fault
• Front Panel LED: Output voltage clipping
• Cooling: Internal heatsinks with thermal protection

Physical

• Height: 42mm (1.65”)
• Depth: 149.9mm (5.9”)
• Width: 432.9mm (17.04”)
• Weight: 938g

Standards

Directive Number	Directive Title
2014/30/EU	The Electromagnetic Compatibility Directive
2014/35/EU	The Low Voltage Directive
2012/19-EU	The Waste Electrical & Electronic Equipment Directive
2011/863/EU	The Restriction of Hazardous Substances Directive

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.

Customer Service

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

 

 

Documents / Resources

contacta V22 Series Hearing Loop Driver [pdf] User Guide V22 Series Hearing Loop Driver, Hearing Loop Driver, Loop Driver, Driver

References

• User Manual