AKG WMS 40 SINGLE/DUAL Wireless Microphone System
Thank you for purchasing an AKG product. This Manual contains important instructions for setting up and operating your equipment. Please take a few minutes to read the instructions below carefully before operating the equipment. Please keep the Manual for future reference. Have fun and impress your audience!
1 Safety and Environment
1.1 Safety
- Do not spill liquids or drop objects through ventilation slots.
- Use only in dry rooms.
- Servicing and repair by authorized personnel only.
- Check AC adapter voltage matches local mains voltage.
- Operate only with the supplied 12-VDC AC adapter.
- If liquid or solid penetrates the unit, shut down immediately, disconnect power, and contact service.
- Disconnect AC adapter when not in use for extended periods. Note: Unit is not fully isolated from power when switched OFF.
- Avoid placing near heat sources, direct sunlight, excessive dust, moisture, rain, or mechanical vibrations/shock.
- Route audio lines away from power lines to prevent hum or interference. Use separate cable ducts for audio lines.
- Clean with a moistened cloth only. Disconnect AC adapter before cleaning. Never use caustic cleaners, alcohol, or solvents.
- Use equipment only for its intended applications. AKG is not liable for damages from improper handling or misuse.
1.2 Environment
- The AC adapter draws current even when the equipment is switched off. Disconnect to save energy.
- When scrapping, separate components and dispose of according to local waste disposal rules.
- Packaging is recyclable; dispose of appropriately.
2 Description
The AKG WMS 40 SINGLE/DUAL series offers reliable wireless audio transmission for various applications. This manual provides detailed information on setup, operation, and maintenance.
2.2 Packing Lists
The WMS 40 SINGLE/DUAL is available in various kits with SR 40 SINGLE or SR 40 DUAL receivers.
Kits with SR 40 SINGLE Receiver:
- Instrumental Set Single: PT 40 PRO bodypack transmitter, AA battery, lettering labels, MKG L guitar cable, SR 40 SINGLE receiver, AC adapter, Manual Supplement sheet.
- Presenter Set Single: PT 40 PRO bodypack transmitter, AA battery, lettering labels, CK 55 L lavalier microphone with clip, W 55 windscreen, SR 40 SINGLE receiver, AC adapter, Manual Supplement sheet.
- Sports Set Single: PT 40 PRO bodypack transmitter, AA battery, lettering labels, C 555 L head-worn microphone, 2 moisture shields, W 444 windscreen, SR 40 SINGLE receiver, AC adapter, Manual Supplement sheet.
- Vocal Set Single: HT 40 PRO handheld transmitter, stand adapter, AA battery, semitransparent replacement clip, SR 40 SINGLE receiver, AC adapter, Manual Supplement sheet.
- Transformer Set Single: SO 40 plug-on transmitter with user manual, black battery cover, AAA battery, lettering labels, SR 40 SINGLE receiver, AC adapter, Manual Supplement sheet.
Kits with SR 40 DUAL Receiver:
- Guitar/Vocal Set Dual: PT 40 PRO bodypack transmitter, AA battery, lettering labels, C 555 L head-worn microphone, 2 moisture shields, W 444 windscreen, GB 40 Guitarbug with user manual, AAA battery, adapter plug, SR 40 DUAL receiver, AC adapter, Manual Supplement sheet.
- Instrumental Set Dual: 2x PT 40 PRO bodypack transmitters, 2x AA batteries, lettering labels, 2x MKG L guitar cables, SR 40 DUAL receiver, AC adapter, Manual Supplement sheet.
- Presenter Set Dual: HT 40 PRO handheld transmitter, stand adapter, semitransparent replacement clip, PT 40 PRO bodypack transmitter, 2x AA batteries, lettering labels, C 555 L head-worn microphone, 2 moisture shields, W 444 windscreen, SR 40 DUAL receiver, AC adapter, Manual Supplement sheet.
- Vocal Set Dual: 2x HT 40 PRO handheld transmitters, 2x stand adapters, 2x AA batteries, 2x semitransparent replacement clips, SR 40 DUAL receiver, AC adapter, Manual Supplement sheet.
Please check that all items are present in your package. Contact your AKG dealer if any item is missing.
2.3 Optional Accessories
Refer to the current AKG catalog or visit www.akg.com for optional accessories. Your dealer can assist you.
2.4 SR 40 SINGLE/DUAL Receivers
The SR 40 SINGLE/DUAL series features stationary receivers compatible with WMS 40 and Microtools Series transmitters. They are housed in a half-rack case for 19" rack mounting. The SR 40 SINGLE offers a single reception channel on a fixed, quartz-stabilized frequency. The SR 40 DUAL combines two SR 40 SINGLE channels in one unit, each operating on a separate frequency.
2.4.1 Front Panel
The front panel of the SR 40 receiver includes:
- 1. ON/OFF: Pushbutton switch with status LED.
- 2. Antenna: Fixed-length UHF antenna (one per channel).
- 3. VOLUME: Rotary control (per channel) for output level adjustment (mic to line level).
- 4. RF OK LED: Indicates signal reception (per channel). Goes out if no signal or automatic squelch is active, muting audio output.
- 5. AF CLIP LED: Indicates audio overload of the received signal (per channel).
- 6. Color code lines: Indicate the carrier frequency of the receiver channel. (Refer to Figure 1 for illustration).
2.4.2 Rear Panel
The rear panel of the SR 40 receiver includes:
- 7. Carrier frequency label: Indicates carrier frequency and approval marks.
- 8. AUDIO OUT: Balanced TRS 1/4" jack, adjustable from mic to line level, for connecting to mixer or amplifier inputs.
- 9. Strain relief: For the AC adapter feeder cable.
- 10. DC ONLY: Input connector for the supplied AC adapter. (Refer to Figure 2 for illustration).
2.4.3 Automatic Squelch
The automatic squelch circuit mutes the audio output when the received signal is too weak, reducing noise.
2.5 HT 40 PRO Handheld Transmitter
The HT 40 PRO handheld transmitter operates on a single fixed UHF frequency and features an integrated antenna. It uses a high-quality cardioid transducer with low handling noise, high gain before feedback, and a built-in wind and pop filter.
2.5.1 Controls
- 11. On/off switch: Slide switch with positions ON, MUTE, OFF.
- 12. Status LED: Indicates operating status (green: battery OK; red: approx. 2 hours remaining).
- 13. Color code clip: Identifies transmitter frequency; can be replaced with a semitransparent clip.
- 14. Battery compartment lid: Refer to section 3.5.
- 15. Carrier frequency label: Indicates carrier frequency and approval marks. (Refer to Figure 3 for controls).
2.6 PT 40 PRO Bodypack Transmitter
The PT 40 PRO bodypack transmitter is designed for use with dynamic and condenser microphones (requiring approx. 4V supply) and instruments like guitars or basses. It operates on a single fixed UHF frequency.
2.6.1 Controls
- 19. Antenna: Flexible, permanently connected.
- 20. Belt clip: For attaching to a belt.
- 21. Battery compartment lid: Includes an integrated screwdriver (21a).
- 21b. Viewing window: For battery status or inserting a label.
- 22. GAIN: Rotary control inside the battery compartment for input level adjustment.
- 23. Carrier frequency label: Indicates carrier frequency and color code. (Refer to Figure 4 for controls).
Audio Input Pinout (18):
- Pin 1: shield
- Pin 2: audio inphase (+)
- Pin 3: supply voltage (4V for condenser mics)
2.6.2 Microphones, Guitar Cable
The PT 40 PRO is compatible with AKG microphones such as CK 55 L, C 417 L, C 520 L, C 555 L, C 516 ML, C 518 ML, and C 519 ML.
The MKG L guitar cable (included in some kits, also available separately) connects electric guitars, basses, or keyboards to the bodypack transmitter.
3 Setting Up
Important: Ensure transmitter and receiver frequencies match (compare color codes). The receiver can be used freestanding or mounted in a 19" rack (using optional RMU 40 kit).
3.1 Positioning the Receiver
Place the receiver near the performance area, ideally 16 ft (5 m) from the transmitter, and at least 5 ft (1.5 m) away from large metal objects, walls, or ceilings. Ensure line-of-sight between transmitter and receiver.
3.2 Connecting the Receiver to a Balanced Input
Use a balanced XLR or 1/4" TRS cable. Connect AUDIO OUT to mixer/amplifier mic input. Set VOLUME control to mic level (CCW).
3.3 Connecting the Receiver to an Unbalanced Input
Use a standard 1/4" jack cable. Connect AUDIO OUT to mixer/amplifier line input. Set VOLUME control to line level (CW). Avoid audio cables longer than 10 ft (3 m) to prevent hum.
3.4 Connecting the Receiver to Power
Connect the supplied AC adapter to the DC ONLY socket (10). Ensure the adapter's voltage matches your local mains voltage. Secure the cable with the strain relief (9). Plug into outlet and press ON/OFF switch (1).
3.5 Inserting and Testing Batteries
Open battery compartment lid (14/21), insert battery according to polarity. Set ON/OFF switch (11/16) to ON. Green LED indicates good battery; red LED indicates approximately 2 hours of remaining life. If LED fails to illuminate, the battery is dead. Replace as needed.
3.6 Setting Up the Handheld Transmitter
Turn receiver ON. Set transmitter ON/OFF switch (11) to ON. Talk or sing into the microphone and adjust levels on the mixer/amplifier.
3.6.1 Replacing the Color Code Clip
Pull off the existing clip (13) and slide on the new semitransparent clip until it clicks.
3.7 Setting Up the Bodypack Transmitter
3.7.1 Connecting a Microphone
Open battery compartment lid (21). Plug microphone's mini XLR connector into audio input (18). Set ON/OFF switch (16) to ON. Turn receiver ON. Talk into microphone. Adjust GAIN control (22) using the screwdriver (21a) until the receiver's AF CLIP LED (5) flashes occasionally. Replace battery compartment lid.
3.7.2 Connecting an Instrument
Open battery compartment lid (21). Plug guitar cable's jack plug into instrument output and mini XLR into transmitter's audio input (18). Set ON/OFF switch (16) to ON. Turn receiver ON. Play instrument. Adjust GAIN control (22) until receiver's AF CLIP LED (5) flashes occasionally. Replace battery compartment lid.
3.7.3 Inserting a Label
Open battery compartment lid (21). Remove and letter a supplied label. Place it on the viewing window (21b). Replace battery and lid.
3.8 Before the Soundcheck
Check for 'dead spots' by moving the transmitter around the performance area. If dead spots are found, reposition the receiver or avoid those areas. The RF OK LED (4) indicates signal reception; if it goes out, switch the transmitter ON or move closer to the receiver.
4 Microphone Technique
4.1 HT 40 PRO Handheld Transmitter
A handheld vocal microphone offers ways to shape your voice's sound. Follow these hints for best results.
4.1.1 Working Distance and Proximity Effect
Voice sounds fuller/mellower closer to the mic. Moving away creates a more distant sound. Proximity effect (boosted low frequencies) occurs when singing less than 2 inches away, adding 'body' and a bass-heavy sound.
4.1.2 Angle of Incidence
Sing to the side or above the microphone for a balanced sound. Singing directly into the mic can cause excessive breath noise and emphasize 's', 'sh', 'tch', 'p', 't' sounds.
4.1.3 Feedback
Feedback occurs when sound from speakers is picked up by the mic and re-amplified, causing howling. The cardioid pattern of the HT 40 PRO helps increase gain before feedback. Position main speakers in front of microphones. Avoid pointing microphones directly at monitors or speakers. Low-frequency resonances can also cause feedback, often resolved by moving slightly away from the mic.
4.1.4 Backing Vocals
Limit to two persons per microphone. Backing vocalists should sing within 35 degrees off-axis to prevent feedback issues.
4.2 CK 55 L Lavalier Microphone
Attach to clothing near the talker's mouth using the clip or tiepin. Aim the microphone at the user's mouth for optimal gain-before-feedback.
4.3 C 555 L Head-worn Microphone
4.3.1 Putting On the Microphone
Wear the microphone, bending the gooseneck so the capsule is positioned to the side in front of the mouth. Adjust for comfort and optimal sound. For pop noise, move the capsule further away; for a thin sound, move it closer.
4.3.2 Windscreen
Attach the supplied windscreen to the microphone capsule to reduce wind or pop noise.
4.3.3 Moisture Shield
The moisture shield protects the microphone capsule from moisture and makeup. Never remove it. A replacement is included if damaged or lost.
5 Cleaning
5.1 Surfaces
Clean surfaces with a soft, moistened cloth.
5.2 Handheld Transmitter Internal Windscreen
Unscrew the wire-mesh cap, remove the windscreen, wash it in mild soap suds, dry, and reassemble.
6 Troubleshooting
| Problem | Possible Cause | Remedy |
|---|---|---|
| No sound. | 1. AC adapter not connected. 2. Receiver OFF. 3. Receiver not connected to mixer/amplifier. 4. VOLUME control at zero. 5. Mic/instrument not connected to bodypack. 6. Transmitter/receiver color codes not identical. 7. Transmitter ON/OFF switch at OFF/MUTE. 8. Transmitter batteries not inserted properly. 9. Transmitter batteries dead. 10. Transmitter too far from receiver. 11. Obstructions between transmitter/receiver. 12. Receiver invisible from transmitter location. 13. Receiver too close to metal objects. | 1. Connect AC adapter. 2. Turn receiver ON. 3. Connect receiver output to mixer/amplifier input. 4. Turn up VOLUME control. 5. Connect mic/instrument to bodypack. 6. Use identical color codes. 7. Set transmitter ON/OFF switch to ON. 8. Insert batteries according to polarity. 9. Replace batteries. 10. Move closer to receiver. 11. Remove obstructions. 12. Avoid spots with no line-of-sight. 13. Move receiver away from metal objects. |
| Noise, crackling, unwanted signals. | 1. Antenna location. 2. Interference (wireless systems, TV, radio, CB, appliances, installation). | 1. Relocate receiver. 2. Switch off interference sources, check installation, or use a different frequency. |
| Distortion. | 1. GAIN control too high/low (bodypack). 2. Interference. | 1. Adjust GAIN control. 2. Switch off interference sources, check installation, or use a different frequency. |
| Momentary loss of sound ("dropouts"). | 1. Antenna location. | 1. Relocate receiver. If persistent, mark and avoid dead spots. |
7 Specifications
7.1 WMS 40 SINGLE/DUAL
| Parameter | HT 40 PRO | PT 40 PRO | SR 40 SINGLE/DUAL |
|---|---|---|---|
| Carrier frequency range | 660 to 865 MHz | 660 to 865 MHz | 660 to 865 MHz |
| Modulation | FM | FM | FM |
| Audio bandwidth | 65 HZ to 20 kHz | 40 Hz to 20 kHz | 40 Hz to 20 kHz |
| Frequency stability (-10°C to +50°C) | ±15 kHz | ±15 kHz | ±15 kHz |
| Rated deviation | 15 kHz | 15 kHz | 15 kHz |
| T.H.D. at 1 kHz | typ. 0.8% | typ. 0.,8% | typ. 0.8% |
| Compander | Yes | Yes | Yes |
| Signal/noise ratio | typ. 110 dB(A) | typ. 110 dB(A) | typ. 110 dB(A) |
| RF output | 10 mW | 10 mW | - |
| Current consumption | typ. 70 mA | typ. 75 mA | SR 40 SINGLE: typ. 95 mA SR 40 DUAL: typ. 175 mA |
| Power requirement | 1 x 1.5 V AA size battery | 1 x 1.5 V AA size battery | 120/230 VAC 50/60 Hz |
| Battery life | typ. 30 hours (for 2200 mAh) | typ. 30 hours (for 2200 mAh) | - |
| Audio input level for rated deviation | - | 25 to 750 mV/1 kHz, adjustable | - |
| Input impedance | - | 1 Mohm | - |
| Condenser mic power supply | - | 4 V/4.7 kohms (pin 3) | - |
| Squelch threshold | - | - | -100 dBm |
| Audio outputs | - | - | bal. 1/4" jack: adjustable from mic to line level. Output level at rated deviation: 500 mV rms |
| Size | 229 x 53 x 53 mm (9 x 2.1 x 2.1 in.) | 60 x 74 x 30 mm (2.4 x 2.9 x 1.2 in.) | 200 x 190 x 44 mm (7.8 x 7.4 x 1.7 in.) |
| Net weight | 160 g (5.7 oz.) | 60 g (2.1 oz.) | SR 40 SINGLE: 580 g (1.3 lbs.) SR 40 DUAL: 620 g (1.4 lbs.) |
7.2 CK 55 L, C 555 L
| Parameter | CK 55 L | C 555 L |
|---|---|---|
| Type | pre-polarized condenser microphone | pre-polarized condenser microphone |
| Polar pattern | cardioid | cardioid |
| Frequency range | 80 Hz to 14 kHz | 80 Hz to 20 kHz |
| Sensitivity | 19 mV/Pa (-34.4 dBV re 1 V/Pa) | 35 mV/Pa (-29 dBV re 1 V/Pa) |
| Electrical impedance at 1 kHz | 1000 ohms | 200 ohms |
| Supply voltage | 1.5 to 10 V from AKG WMS bodypack transmitter | B 29 L battery supply, MPA V L phantom power adapter, AKG WMS bodypack transmitter |
| Cable length | 1.6 m (5 ft. 4 in.) | 1.5 m (5 ft.) |
| Connector | 3-pin mini XLR | 3-pin mini XLR |
| Finish | matte black | matte black |
| Size | 8 dia. x 22 mm (0.3 x 0.9 in.) | length: 195 mm (7.7 in.), max. dia.: 134 mm (5.3 in.) |
| Net weight | 3 g (0.1 oz.) (w/o cable) | 26 g (0.9 oz.) |
7.3 SO 40
| Parameter | SO 40 |
|---|---|
| Carrier frequency range | 660 to 865 MHz |
| Modulation | FM |
| Audio bandwidth | 40 to 20,000 Hz |
| Frequency stability (-10°C to +50°C) | ±15 kHz |
| Rated deviation | 15 kHz (SP1, SP2: 13.5 kHz) |
| T.H.D. at 1 kHz | typ. 0.8% |
| Compander | integrated |
| Signal/noise ratio | typ. 103 dB(A) |
| RF output | typ. 5 mW |
| Current consumption | typ. 75 mA |
| Power requirement | single 1.5-V AAA size battery |
| Battery life | >11 hours (dry battery) >6 hours (rechargeable battery) |
| Audio input level for rated deviation | 300 mV/1 kHz |
| Size (WxDxH) | 22 x 30 x 98 mm (0.8 x 1.2 x 3.8 in.) |
| Net weight | 36 g (1.3 oz.) |
This product conforms to the standards listed in the Declaration of Conformity. To order a free copy, visit http://www.akg.com or contact sales@akg.com.
