The Audio Choice QM4 is a professional 4-channel passive microphone mixer designed to combine up to four microphone signals into a single output. It is a utility tool commonly used in simple PA setups, small recording projects, or situations where a powered mixer is unavailable. Device Overview
The QM4 is a passive device, meaning it does not require a battery or external power source to operate. It uses internal transformers and resistors to manage the signals. Because it is passive, it does not provide gain; instead, it provides attenuation (reduction) of the input signals to balance them. Key Features Four independent XLR female inputs. One XLR male output. Individual volume control knobs for each channel. Passive circuitry (no power required). Rugged metal chassis for durability. Setup and Connection Connect your microphones to any of the four XLR inputs.
Connect the XLR output of the QM4 to your amplifier, powered speaker, or recording interface.
Start with all volume knobs turned fully counter-clockwise (off).
Slowly turn up the knob for the primary microphone until you reach the desired level.
Adjust the remaining knobs to blend the other microphones into the mix. Operating Requirements and Limitations
Dynamic Microphones Only: Since the device is passive, it cannot pass Phantom Power (48V). Do not use condenser microphones with the QM4 unless they are self-powered by their own batteries.
Signal Loss: Being a passive mixer, there is a natural "insertion loss" of signal strength (typically around 6dB to 10dB). You may need to turn up the gain on your amplifier or powered speaker to compensate.
Impedance: It is designed for low-impedance (Lo-Z) microphones. Using high-impedance equipment may result in significant signal degradation or noise. Troubleshooting
No Sound: Ensure all cables are fully seated and that your output device (speaker/amp) is turned on and turned up.
Weak Signal: This is normal for passive mixers. Increase the volume on your destination device.
Distortion: Ensure you are not sending a line-level signal (like from a CD player or keyboard) into the mic inputs, as this will overdrive the internal transformers.
Hum or Buzz: Use shielded XLR cables and ensure the mixer is not sitting directly on top of a large power transformer or amplifier.
⭐ Pro Tip: For the best signal-to-noise ratio, keep your microphone cables as short as possible and use the highest gain setting available on your speaker or amplifier rather than cranking the QM4 knobs to their absolute maximum.
The Audio Choice QM4 by SoundTech is a 100-watt, 4-channel powered mixer designed for portable PA applications like small venues and karaoke, featuring independent channel controls and 3-band master EQ. Often paired with C100 speakers, the unit offers versatile inputs including 1/4" and XLR jacks, with options for EFX loops and reverb. Technical details and unit availability can be found at Musician's Friend Audio Choice C100 100W Portable PA System
The handheld microphones use a simple interface to manage power, volume, and channel selection. Power On/Off: Press and hold the Power Button.
Battery Installation: Unscrew the microphone base to reveal the compartment. Insert 2 x 1.5V AA batteries.
Channel Switching: Press and hold the Set Button for approximately 4 seconds until the display blanks. The unit will cycle through channels in the order A, B, C, and D. Volume Adjustment: Press the Set Button once to enter volume mode. Press the Set Button again to adjust the level. The device exits this mode after 5 seconds of inactivity.
Button Lock: To prevent accidental changes, press and hold both the Set and Power buttons simultaneously for 3 seconds. Repeat to unlock. Receiver & System Operations audio choice qm4 manual
The system uses UHF frequencies (typically 902-928MHz depending on your specific region) to provide digital audio transmission.
Connection: Ensure the receiver is connected to your mixer or amplifier using the balanced XLR or unbalanced 1/4" jack outputs.
Signal Monitoring: The receiver will display Signal Strength icons when the microphone is successfully paired and within range.
Mute Function: Depending on the specific firmware version, some QM4-style handhelds allow muting by double-clicking the volume or power key. Troubleshooting Guide If you encounter issues, check these common solutions:
No Sound: Verify the transmitter is not in "Mute" and check if the receiver's volume is turned up.
Interference: If you hear static or other voices, use the Set Button to switch all components to a different channel (A, B, C, or D) to find a clearer frequency.
Distortion: If the audio is too loud or clipping, turn down the Volume on the receiver or the Gain on your mixer.
Power Issues: If the LED doesn't light up, ensure the power adapter is securely connected to both the wall and the receiver. PROFESSIONAL WIRELESS MICROPHONE SYSTEM MANUAL
Function of Handheld Microphone Transmitter 1. Microphone head 2. LCD screen 3. Power switch: Press and hold to turn on or off. 4. FCC Report WIRELESS MICROPHONE SYSTEM
Report: Product Specification and Feature Analysis
Subject: Audio Choice QM4 Mixer/Amplifier Date: October 26, 2023 Prepared By: Technical Documentation Specialist
Thank you for purchasing the Audio Choice QM4. This manual provides instructions for safe operation, setup, and maintenance of your device. Please read it carefully before use and keep it for future reference.
| Problem | Possible solution | |---------|------------------| | Cannot power on | Charge battery for at least 30 minutes; try a different USB cable. | | No sound / distorted audio | Check volume level; ensure Bluetooth device is not muted; move device closer. | | Bluetooth not pairing | Turn QM4 off/on; delete old “QM4” from phone’s Bluetooth list; re-pair. | | microSD/USB not recognized | Format card as FAT32; limit file depth (no subfolders over 2 levels). | | FM radio poor reception | Extend any attached USB/AUX cable as an antenna; move near a window. |
Audio Choice offers a limited 1-year warranty against manufacturing defects. For support, contact your local retailer or visit the support website (if listed on the product packaging). Retain your purchase receipt as proof of purchase.
Note: If your physical QM4 has different buttons, display, or features (e.g., no FM, no TWS), please modify the sections above accordingly. For a specific brand’s exact manual, look for a QR code on the product box or search “Audio Choice QM4 official manual PDF.”
To help you set up or share information about your Q Acoustics Media 4 (M4)
soundbar, here are a few options for a "post" depending on whether you need a quick-start guide, a social media feature, or a technical snippet. 🔊 Quick Setup Guide Post Title: Getting Started with your Q Acoustics M4 Soundbar
Placement: Place the unit on a shelf or wall-mount it using the provided bracket. Note: Ensure at least The Audio Choice QM4 is a professional 4-channel
of spacing around ventilation openings and avoid mounting it upside down [0.5.1]. Connections:
Digital: Use the Optical (TOSLINK) input for the best sound from your TV. Analog: Use the RCA or 3.5mm Jack for older devices. Bluetooth Pairing: Turn on the and select the Bluetooth input (Blue LED). Search for "
" on your device or use NFC by tapping your compatible phone against the "N" logo on top of the bar. Audio Tips: The
features a built-in subwoofer. For the best bass response, ensure it isn't completely enclosed in a cabinet. 📱 Social Media / "For Sale" Post Headline: Upgrade Your Home Cinema – Q Acoustics M4 Soundbar 🎶
Award-Winning Sound: High-performance BMR (Balanced Mode Radiator) drivers for wide sound dispersion.
Built-in Subwoofer: Big bass without the extra bulky box on the floor.
Easy Connectivity: Bluetooth aptX for CD-quality streaming, Optical input for TV, and NFC one-touch pairing. Condition: [Insert Condition, e.g., Like New/Excellent]
Included: Original remote, power cable, and wall-mounting bracket. Feel free to DM for the full digital manual if you need it! 🛠️ Technical Resources
If you are looking for the official documentation, you can access it via the Q Acoustics Support Portal [0.5.2].
Instruction Manual: Detailed guide for wall mounting and EQ settings.
Quick Start Guide: One-page visual setup for cables and Bluetooth.
Audio Choice QM4 (produced by ) is a portable, 4-channel powered PA mixer designed for live performances, DJ gigs, and small venues. It is commonly bundled with speakers, such as the
or original 2-way 10" enclosures, to create a complete sound system. System Features Power Output : Delivers 100 Watts RMS at 4 Ohms. : Four individual input channels, each featuring both Channel Controls : Individual adjustments for Master Section
: Includes a 3-band Master EQ, master reverb level, and master volume controls. Connectivity Options : For connecting external effects processors.
: For sending the signal to additional amplifiers or recording devices. Footswitch Jack : Allows remote control of the onboard spring reverb. Physical Specifications
The system is built for portability with rugged construction and integrated handles. Dimensions (H x W x D) QM4 Mixer Head 6" x 18.5" x 11.5" C100 Speaker (Each) 19.5" x 14" x 11" Operational Highlights Spring Reverb
: The QM4 uses an original analog spring reverb for a classic "wet" vocal or instrument sound. Low Noise Performance
: The mixer is designed to remain silent when no audio is playing and maintain clarity even at high output levels. Ease of Use Power Button (Long press: ON/OFF) Volume + /
: With straightforward controls and standard connectors, it is frequently used for bar trivia, karaoke, and small band practices.
The Audio Choice by Sound Tech QM4 is a 100-watt, 4-channel powered mixer head designed for small PA systems, featuring XLR/1/4" inputs, individual channel EQ, and onboard reverb. Operated by connecting passive speakers to the rear output and balancing channel levels with the master volume, this legacy unit is frequently found on reselling platforms. For a detailed listing with specs, visit Reverb.
Introduction
The Audio Choice QM4 is a high-quality audio amplifier designed for home and professional use. This guide will walk you through the manual to help you get started with your QM4.
Front Panel Controls
Rear Panel Connections
Operating the QM4
Additional Features
Troubleshooting
Specifications
Conclusion
The Audio Choice QM4 is a versatile and high-performance audio amplifier. By following this guide, you'll be able to understand its features and operations, ensuring a great listening experience.
Audio Choice QM4 (often branded as Audio Choice by SoundTech
) is a 100-watt, 4-channel powered PA mixer head typically sold as part of the C100 portable system. While a formal digital manual is rare, the device's straightforward analog design allows for easy operation based on its physical controls. Musician's Friend Core Specifications Power Output : 100 Watts RMS at 4 Ohms. : 4 independent input channels. Dimensions : approximately 18.5" W x 11.5" D x 6" H.
: Mixer head weighs roughly 9.5 to 20.5 lbs depending on the specific revision/listing. Key Controls & Features Input Options : Each of the four channels features combination (line) inputs. Channel Controls : Individual knobs for on every channel. Master Section : Includes a (High, Mid, Low), a master control, and a master Connectivity : For connecting external effects processors.
: For sending a signal to another amplifier or recording device. Footswitch Jack : Allows for remote toggling of the built-in spring reverb. Basic Operation Guide Connections
: Plug microphones into the XLR ports and instruments (like keyboards or guitars) into the 1/4" ports. Connect your passive speakers to the outputs on the rear using 1/4" speaker cables.
: Ensure master volume is at zero before turning on the power switch to avoid pops. Setting Levels
: Adjust individual channel gain until the signal is clear without distortion, then use the master level to control overall volume. Tone Shaping
: Use the individual channel tone knobs for quick adjustments and the master 3-band EQ for room-wide sound correction.