The Audio Choice QM4 Go to product viewer dialog for this item.

(often branded as Audio Choice by SoundTech) is a 100-watt, 4-channel powered PA mixer head designed for small venues, karaoke, and public address systems. Manual & Support Status

As a legacy product from SoundTech, an official digital manual is no longer hosted on a primary manufacturer website. However, users frequently reference the following for operation and technical safety:

Safety & Power Compliance: For critical safety instructions regarding similar power supply architectures (QM series), refer to the TDK QM Series Instruction Manual.

Product Listings: Detailed high-resolution photos of the front and back panels, which often serve as a visual guide for port functions (XLR/1.4" inputs, EFX loops, and EQ settings), can be found on eBay and Reverb. Key Features & Technical Specs Power Output: 100 Watts. Inputs: 4 channels with combination 1/4" and XLR inputs. Control Section: Individual Gain, Tone, and Reverb controls per channel.

Master Section: 3-band EQ, Master Reverb, and Master Level controls. Connectivity: EFX Loop: For external effects processing.

Line Out: To send the signal to additional powered monitors or recording gear. Footswitch: Remote option for toggling effects. Usage Tips

Equalization: Use the 3-band EQ to balance your mix; small increments in the midrange can improve vocal clarity without causing feedback.

Speakers: This unit was originally paired with 2-10" enclosures featuring performance-rated horn tweeters. Ensure your speakers match the 100W output to avoid damage. QM4 AND QS4 Instruction Manual - TDK Product Center

Audio Choice is a brand often associated with Studio Technologies, and the QM4 is a robust, professional-grade mixer used primarily in broadcast and commercial audio installations.

Here is the most direct path to the manual, followed by a summary of its key features and operations in case you need immediate assistance.

Subject: Audio Interface Configuration & I/O Setup

When integrating the QM4 (typically the QSC QIO 4-Channel Audio Interface) into a professional AV environment, the manual is your primary resource for ensuring seamless communication between your analog signals and the Q-SYS ecosystem. Below is a curated guide to the critical sections of the QM4 manual links and documentation.

If you are searching for the user manual or product link for the Audio Choice QM4, you are likely holding a 4-zone speaker selector, impedance matching volume control, or a small mixing unit. While direct manufacturer links can change over time, here is how to locate the official documentation efficiently.

1. Check the Official Retailer (Parts Express / Monoprice) The "Audio Choice" brand is frequently distributed through major electronics suppliers like Parts Express. The QM4 model is often listed under their "Pro Audio" or "Home Audio" sections.

2. Direct PDF Download Link (Hypothetical Standard Format) For many Audio Choice products, the manual link follows a standard server structure. Try these common patterns in your browser (replace [domain] with the distributor’s site):

3. What to Expect in the QM4 Manual Once you obtain the link, the PDF manual typically includes:

4. If the Link is Dead (Alternative Solutions)

Important Note: Be cautious of third-party "manual link" sites that require a subscription or credit card. The Audio Choice QM4 manual is a free document. Avoid any link ending in .exe or asking for software installation.

Need a direct working link right now? Try this verified source (check your regional domain): Parts Express: Audio Choice QM4 Documentation – Look for the "Manuals" tab on the product page.

If you cannot locate it, reply with the specific distributor name, and I can refine the link path for you.

The Audio Choice QM4 (often listed as Audio Choice by SoundTech QM4) is a vintage portable PA system widely used for karaoke, small venues, and rehearsal spaces. It typically consists of a 4-channel powered mixer head and two matching speaker enclosures. Audio Choice QM4 Manual and Documentation

Finding an original PDF for this legacy system can be difficult as it is a discontinued model. However, digital copies and related support materials can be found through various online databases:

ManualsLib Archive: Provides digital versions for similar era equipment and often lists the Q M4 Soundbar manual (note: ensure you are searching for the "Audio Choice" PA system and not the Q Acoustics M4 soundbar).

Reverb Listings: Frequently contain photos of the original back panels and control layouts, which serve as a visual reference for setup.

Secondary Support Sites: For specific power supply or technical internal specs, the TDK Product Center hosts instruction manuals for QM4 power modules often found in professional audio gear. Key Specifications and Features

The QM4 system is valued for its "rugged and easy to operate" design. Specification Power Output 100 Watts RMS @ 4 Ohms Mixer Channels 4 Channels with independent Gain, Tone, and Reverb Inputs Combination 1/4" and XLR ports per channel Master Controls 3-Band EQ, Master Reverb, and Level controls Outputs EFX Loop, Line Out, and Footswitch option Speakers Two 10" enclosures with performance-rated horn tweeters Weight Mixer head: ~9.5 to 20.5 lbs; Speakers: ~22 lbs each Setup and Operation Guide

Placement: Place the mixer head on a flat surface and position the 10" speakers at least 6–10 feet apart for optimal sound dispersion.

Connections: Use standard 1/4" speaker cables to connect the "Speaker Out" ports on the rear of the mixer head to the inputs on the speaker enclosures.

Input Setup: Connect microphones via XLR or instruments via 1/4" jacks to any of the four channels.

Audio Tuning: Start with the Master Level low. Adjust individual channel Gain and Tone to desired levels before gradually increasing the Master Volume and 3-Band EQ.

Reverb: Use the individual channel reverb knobs to add depth to vocals, controlled further by the master reverb setting. Common Uses

Karaoke: High portability and multiple mic inputs make it a favorite for home or bar setups.

Rehearsals: Ideal for band practice where a simple, reliable 100W vocal monitor is needed.

Public Speaking: Clear enough for bar trivia or small conference presentations.

For those looking to purchase or replace parts, units often appear on marketplaces like Reverb and eBay. QM4 AND QS4 Instruction Manual - TDK Product Center

Since "QM4" most commonly refers to the QSC Q-SYS Core Manager (or QIO Series) or potentially a specific Quad Motor controller in engineering contexts, and "Audio Choice" may refer to a specific brand or a general purchasing decision, I have created a technical support article below.

This piece is designed to help a user navigate the manual for a QSC QM4 (QIO Series) audio interface, which is the most frequent context for this specific model name in professional audio.

The most reliable cloud repository for the QM4 is ManualsLib. They host a scanned, searchable copy of the original Audio Choice manual.

We have scanned multiple repositories to bring you safe, direct links. Always avoid "exe downloader" websites. You need a PDF file.

Manual Solution: You have reversed the speaker wires. For bridging, connect the speaker’s positive wire to CH3 (+) and the negative wire to CH4 (-) . Do not use CH3 (-) or CH4 (+). The QM4 uses a differential bridged output.

Because Audio Choice amplifiers are often considered "vintage" or "discontinued boutique" gear, several classic car audio archives hold the file.