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
The channel gain is likely too high. Turn down the individual channel gain and increase the master volume instead. Hissing/Noise: Turn down the gain on unused channels. Maintenance for Long-Term Use To keep your Audio Choice QM4 working efficiently:
The is a robust, portable 4-channel professional audio sound system, often categorized under "SoundTech" or "Audio Choice Professional Audio." It is designed for small to medium-sized events, such as presentations, small musical performances, PA systems for classrooms, or mobile DJ setups.
: 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.
, tracking down documentation often requires looking for legacy SoundTech support: Vintage Gear Communities : User-contributed manuals are frequently uploaded to audio choice qm4 manual link
If your device is a mixer/amplifier, you are likely dealing with the . The following sections assume this is your product.
If you are looking for the —specifically for the acclaimed Q Acoustics M4 soundbar (often referred to interchangeably in audio circles)—you have come to the right place. The Q Acoustics M4 is a premium, versatile soundbar designed to deliver superior audio performance for home entertainment, combining simplicity with high-fidelity sound.
The QM4 system is valued for its "rugged and easy to operate" design. Specification 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
Connect your passive PA speakers (such as the matching Audio Choice C100 cabs) to the speaker outputs on the rear panel using unshielded speaker cables. Do not use thin instrument cables for speaker connections. 2. Input Configuration Plug microphones into the XLR inputs. This unit was originally paired with 2-10" enclosures
The QM4 integrates a pre-amplifier, an equalizer, and a power amplifier into one central unit. Specification Core Function 4 Separate Channels
If your system is not operating correctly, consult this quick guide, or refer to the manual for in-depth troubleshooting.
Follow this systematic sequence to configure the QM4 safely, minimizing the risk of speaker blowouts or terminal damage:
Turn all channel volume knobs and the Master Volume knob completely down counterclockwise before flipping the power switch. Turn down the individual channel gain and increase
If you are unable to find the full PDF, here are the core operating details for the SoundTech unit: 100 Watts at 4 ohms.
: SoundTech was historically associated with the same parent groups as Soundcraft. You can check the Soundcraft Manuals Archive
If you are looking for the soundbar often labeled "QM4" in search results, the official Q Acoustics M4 User Manual is available for direct download.
: Frequently contain photos of the original back panels and control layouts, which serve as a visual reference for setup.