If you have just purchased an Audio Choice QM4—whether it’s a portable Bluetooth speaker, a pair of noise-canceling headphones, or a microphone system (depending on the specific product line)—having access to the official manual is crucial. Unfortunately, physical manuals are often misplaced, or the "quick start" guide included in the box leaves too many questions unanswered.
This article serves as a comprehensive resource for the Audio Choice QM4 Manual. We will cover where to download the official PDF, how to set up your device, advanced feature explanations, common error codes, and step-by-step troubleshooting. By the end, you will know your QM4 device inside and out.
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.
For zero latency (gaming or video editing), use the included 3.5mm cable.
The manual outlines several advanced features that casual users often overlook. Here’s what the QM4 can really do.
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.
The Audio Choice QM4 Go to product viewer dialog for this item.
is a versatile 4-channel powered mixer designed for small venues, rehearsal spaces, and mobile live sound setups. Below is a comprehensive guide to its setup and operation, structured to help you understand its core functions. 1. Input Connections and Channel Strips
features four independent channels, allowing you to connect various audio sources:
Microphone (XLR) Inputs: Used for low-impedance microphones. Ensure these are connected before powering the unit on.
Line (1/4") Inputs: Ideal for instruments like keyboards, electronic drums, or acoustic guitars with preamps. audio choice qm4 manual
Level Controls: Each channel has its own volume knob to balance the signal before it reaches the master output. 2. Master Output and Power Section
The master section controls the overall volume of your sound system:
Master Volume: Adjusts the final signal sent to the speakers. EQ Controls
: Typically includes high and low frequency adjustments to tune the overall sound to the room. Built-in Amplifier: As a "powered mixer," the
drives passive speakers directly via the outputs on the rear panel. 3. Safe Setup and Positioning
To maintain performance and longevity, follow these physical placement guidelines:
Ventilation: Do not mount the unit inverted or vertically with downward airflow. Ensure at least 50mm of clearance around ventilation openings to prevent overheating.
Power Sequencing: Always turn your mixer volume down before switching on the power to avoid speaker "pops" that can damage components. 4. Troubleshooting Common Issues
No Sound: Check the Master Volume and individual channel gain. Ensure speakers are connected to the "Powered Output" and not just a line-level output.
Distortion: This usually occurs if the channel level or master volume is pushed too high. Lower the input signal and increase the master volume if more loudness is needed. If you have just purchased an Audio Choice
Hum or Buzz: Ensure you are using shielded cables for instruments and that the unit is plugged into a grounded power source.
For more technical projects involving larger setups or specialized audio equipment, you might also find the Q Acoustics M4 User Manual or similar TDK Product Manuals
helpful for understanding broader power and audio standards. QM4 AND QS4 Instruction Manual - TDK Product Center
The Audio Choice QM4 (by SoundTech) is a 4-channel, 100-watt powered PA mixer head designed for live sound reinforcement, such as small club gigs, band practices, or karaoke.
While a dedicated digital manual is rare for this discontinued unit, the following operational and technical information serves as a comprehensive guide for its use. Core Specifications Power Output: 100 Watts RMS at 4 ohms. Channels: 4 independent input channels.
Inputs: Each channel features combination XLR (balanced) and 1/4" jack (unbalanced) inputs.
Weight: Approximately 9.5 to 20.5 lbs depending on the specific model variation/enclosure. Operational Controls Per-Channel Controls: Gain: Sets the input sensitivity for the specific channel. Tone: Basic equalization for individual sound sources.
Reverb: Controls the amount of built-in spring reverb effect applied to that channel. Master Section:
3-Band EQ: Global Low, Mid, and High frequency adjustments for the overall output.
Master Level: Controls the final volume sent to the speakers. Tracking Force:
EFX Loop: Allows for the connection of external effects processors.
Line Out: For sending the mixed signal to another amplifier or recording device.
Footswitch Jack: Typically used to remotely toggle the internal reverb. Setup and Safety Instructions
Speaker Connection: Use standard 1/4" speaker cables to connect to passive enclosures. The system was originally bundled with 2x10" enclosures.
Power Sequencing: To protect your speakers, always turn the Master Level to minimum before powering on. Turn the power amplifier (PA head) on last and off first in your signal chain.
Clipping: If the "CLIP" or "PEAK" indicator lights up, reduce the individual channel gain or master volume immediately to prevent distortion and hardware damage.
Maintenance: The unit contains no user-serviceable parts. If the master EQ becomes "scratchy" over time, it may require professional cleaning of the internal potentiometers. QM4 AND QS4 Instruction Manual - TDK Product Center
You can adjust the technical details (battery size, button labels, etc.) based on the actual physical product.
| Status | LED Behavior | |--------|---------------| | Charging | Red solid | | Fully charged | LED off / Blue solid (if on) | | Bluetooth pairing mode | Blue flashing quickly | | Bluetooth connected | Blue solid (or slow pulse) | | Low battery | Red flashing every few seconds | | AUX / microSD / USB mode | Blue solid or slow blink (varies) | | FM radio | Blue slow blink |
If you are waiting to find your manual or prefer a digital reference, here is the condensed setup guide based on the official Audio Choice QM4 Manual.