Audio2000'S® AWM6546DU

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AWM6546DU - Professional Dual-Diversity UHF Wireless System with 100 Adjustable Frequencies

The Audio2000'S® AWM6546DU wireless system is a UHF dual-channel diversity wireless microphone system.   Similar to the other Audio2000'S® wireless systems, various transmitter options are provided to the AWM6546DU system users as follows:

Handheld Wireless Microphone System - AWM6546DU (AWR6546DU + 2 X AWX6540's)


Lavaliere (Lapel) Wireless Microphone System - AWM6546DUM (AWR6546DU + 2 X AWX6540M's)


Handheld & Lavaliere Wireless Microphone System - AWM6546DUL (AWR6546DU + AWX6540 + AWX6540M)


Headset Wireless Microphone System - AWM6546DUH (AWR6546DU + 2 X AWX6540H's)


Handheld & Headset Wireless Microphone System - AWM6546DUX (AWR6546DU + AWX6540 + AWX6540H)


Guitar Wireless System - AWM6546DUG (AWR6546DU + 2 X AWX6540G's)


Guitar & Handheld Wireless System - AWM6546DUQ (AWR6546DU + AWX6540G + AWX6540)


Guitar & headset Wireless System - AWM6546DUR (AWR6546DU + AWX6540G + AWX6540H)


Optional Professional Miniature Condenser Headset Microphone for the AWX6540H - ACC6540H-01 or ACC6540H-01B

Optional Microprocessor Controlled Charger for AWX6540 - ACC6546-01

With the exceptional RF transmission and reception of the dual diversity circuitries, the AWM6546DU system, with a transmission range of more than 250 feet, fully delivers all the reception and audio quality features that allow you to really enjoy the freedom of wireless without any of the problems.

Engineered For Dependable UHF Systems

As all the other Audio2000'S® wireless products, the AWM6546DU system has been engineered to be dependable dual-channel diversity UHF system with a wide audio frequency range, high S/N ratio, and outstanding performance equal to that of any professional wireless systems costing much more.  This is achieved through strict component selection and high quality circuit design.  A delicately designed silence circuit eliminates static noise when the transmitters are either turned off or out of transmission range.  An auto mute circuit is incorporated in these systems to effectively eliminate the popping noise when the switch is turned on or off.

System Designed For Accessibility

The AWM6546DU system has been designed and manufactured to be dependable, problem free, versatile and easy to use.  The AWM6546DU system is intended to be readily accessible to everyone with exceptional performance at a preferred and affordable price.


Musician; disc jockey (DJ); karaoke jockey (KJ); church; school; conference room; karaoke; home entertainment



* Dual-Channel Diversity Wireless Receiver
* 100 Adjustable Frequencies with PLL Synthesized Control

* UHF Band Frequency
* Two Independent XLR Balanced Outputs
* One 1/4"
Unbalanced Audio Output
* RF Input with Built-in RF Preamplifier to Improve S/N Ratio, Sensitivity and Dynamic Range
* Low Noise Mixer Circuitry for Reducing interference
* Two Squelch Control Knobs (One for Each Channel) at the Rear Panel
* Removable Antennas
* LCD Display Panels and Computerized Numerical Control


Carrier Frequency Range

 571 - 598 MHz

Frequency Stability

 10 ppm

Receiving Sensitivity

 -105 dBm (S/N: 12 dB)

S/N Ratio

 > 105 dB


 < 1%

Audio Output

¼” (0 – 360mV @ 3K Ohms
XLR (0 – 24mV @ 600 Ohms)

Dimensions (W X H X D)

 19.0” X 1.7” X 8.4” (483 X 43 X 213 mm)



* UHF Band Frequency
* 100 Adjustable Frequencies with PLL Synthesized Control

* High Sensitivity Cardioid Microphone Capsule
* Audio Level Adjustment Knob for the AWX6540M, AWX6540H, and AWX6540G
* Noise Reduction Mechanism for Eliminating Handling Noise and Switch Shock Noise

* Computerized Numerical Control
* LCD Display Panel



Carrier Frequency Range

 571 - 598 MHz

Frequency Stability

 10 ppm


 Frequency Modulation (FM)

Modulation Depth


Output Power

 10mW, Nominal (with 50 Ohms Load)

Spurious Emission

 > 55 dB


 AA Batteries X 2

Current Consumption

 < 100 mA

Dimensions (W X H X D)

Handheld: 9.6” X 2.0” X 2.0” (245 X 50 X 50 mm)
Belt-Pack: 4.7” X 2.6” X 0.9” (119 X 67 X 24 mm)


Carrier Frequency Range

 571 - 598 MHz

Frequency Stability

 10 ppm

Audio Frequency Response

 50 – 15,000 Hz (-3 dB)

Image and Spurious Rejection

 > 80 dB

S/N Ratio

 > 105 dB

Max. SPL



 < 1%

Service Area

 330 ft (100 M), Line of Sight

Operation Temperature

 -4 °F – +120 °F (-20 °C – +49 °C)


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  1. Connect the AWR6546DU receiver DC input to an AC power source via the supplied AC/DC adaptor.

  2. Connect the supplied two antennas to the antenna connectors on the AWR6546DU.

  3. Connect the AWR6546DU receiver audio outputs to the microphone inputs of a mixer via the supplied audio cable or any other appropriate cable.  (Note: There are two outputs: one unbalanced output and Two independent balanced outputs.)

  4. Place two AA batteries into the battery housing of the AWX6540, AWX6540M, AWX6540H, or AWX6540G wireless transmitter with the battery polarity oriented as indicated.

  5. Press the power On/Off button continuously until the AWR6546DU is turned on.

  6. If the channel numbers on the AWR6546DU receiver match those on the AWX6540 transmitters and the channel number of the channel A is different from that of the channel B, the AWM6546DU system is ready to be used. If any of the channel numbers on the receiver does not match the channel numbers of both transmitters, that particular channel needs to have its channel number readjusted to match the available transmitter channel number.

  7. To readjust the AWR6546DU channel number, please refer to the content on page 3 of the Owner's Manual for the operation details. 

  8. Adjust the volume control knob on the AWR6546DU receiver to have an optimal sound quality.


  1. The AWX6540, AWX6540M, AWX6540H, or AWX6540G needs to be turned off before changing the AA batteries.

  2. Signal dropout or unexpected noise may be caused by a low battery or by an excessive distance between the transmitter and the receiver.  If you encounter signal dropout or unexpected noise, please check the battery first.  If battery is still fresh, try to readjust the antennas on the AWR6546DU receiver.

  3. Avoid placing the receiver in a corner to prevent any RF reception deterioration.

  4. Avoid placing the receiver antennas close to an obstruction or close to any metal surface.

  5. Try to place the receiver as far away from any digital equipment, including computers and some CD players, as possible.

  6. If more than one AWM6546DU wireless microphone systems are stacked together or placed in a rack, do not let the antennas touch each other or cross each other.

  7. Before the AWM6546DU is to be used in a new location, place the AWR6546DU receiver at the intended location and walk-through the area with the transmitter to locate any radio frequency blind spot, where a momentary loss of sound or short period of noise may occur whenever the transmitter is moved to this spot.

  8. Do not drop the transmitter on the floor or strike the transmitter with any object.

  9. Always turn off the transmitter and remove the batteries if the transmitter is not to be used for a period of time to prevent the transmitter from being damaged by a leaking battery.


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No sound.

Receiver is off.

Turn on receiver.

Transmitter power switch is off.

Turn on transmitter power switch.

No battery or bad battery in transmitter.

Insert or replace battery.

Wrong polarity or faulty battery contact

Correct polarity or battery contact.

Receiver audio cable is missing or defective.

Connect, repair or replace cable.

Short range or signal dropouts.

Low transmitter battery level.

Replace transmitter batteries.

Poor antenna reception.

Reposition antenna or receiver.

Faulty transmitter antenna.

Return transmitter to factory or authorized service station for service.

Too many obstacles between the receiver and transmitter.

Move the obstacles or move the receiver away from nearby metal objects.

Signal Interference.

Another wireless microphone operating on the same frequency

Use a wireless microphone with different operating frequency.

Placement too close to a digital signal processor or similar device (CD player, stage lighting, etc.).

1.       Select another operating frequency

2.       Move receiver to another location

External electromagnetic field source

1.       Select another operating frequency.

2.       Remove source of interference


Low transmitter battery level

Replace transmitter batteries.

AF Level control on the transmitter set too high, overloading the receiver circuit.

Turn down the AF Level control on the transmitter.

Volume control on the receiver set too high, overloading the subsequent sound device input.

Turn down the volume control on the receiver.

Momentary loss of sound when transmitter is moved around the performing area.

Radio frequency (RF) blind spots.

Reposition the receiver.  If the momentary loss of sound problem cannot be removed, walk through the performing area and mark “Blind” spots.  Avoid these “Blind” spots during performance.

Low sound level.

Faulty cable connection.

Check cable connection between the receiver and the subsequent sound device.

Receiver volume control set too low.

Turn up receiver volume control.

Sound levels between two microphones are different.

The receiver volume control and/or  the microphone AF Level control need to be adjusted.

1.       Adjust the transmitter gain control as necessary.

2.       Adjust the receiver volume control as necessary.


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