: Use individual channel EQs to correct problem frequencies (e.g., cutting low-end rumble on microphones). Use the Master Graphic Equalizer to adjust the overall tone to match the room's acoustics. Troubleshooting Common QM4 Issues
Audio Choice QM4 Manual: Guide to the Sound Tech 4-Channel Powered PA System Audio Choice by Sound Tech QM4 Go to product viewer dialog for this item.
Understanding your hardware limits ensures you get ultra-crisp audio with an extended bass response without risking internal component failure. Specification 100 Watts RMS @ 4 Ohms Supports two 8-ohm speakers in parallel Channels 4 Monophonic Channels Individual EQ, gain, and effects routing Inputs per Channel 1 x XLR (Balanced), 1 x 1/4" TS Jack (Unbalanced) Dual-architecture input preamp stage Master EQ Section 3-Band Graphic/Rotary Equalizer Global Low, Mid, and High tone contours Integrated Effects Analogue Spring Reverb Individual channel sends + master return control Expansion Patchbay EFX Loop (Send/Return), Line Out, Footswitch Rear/Front master interface routing options Weight & Build 20.5 lbs (Head Only) Heavy-duty protective corners with carry handle 🎛️ Channel Control & Interface Breakdown Each of the four channels on the Audio Choice QM4
While an official manual is not available, the QM4's core specifications, as advertised, provide a basis for understanding its capabilities. audio choice qm4 manual
: Check the Master Volume and individual channel gain. Ensure speakers are connected to the "Powered Output" and not just a line-level output.
Concise feature notes
: Allows connection of a standard latching single button footswitch to instantly mute or unmute the internal reverb effect remotely. 🔊 Speaker Matching & Enclosure Setup Audio Choice QM4 : Use individual channel EQs to correct problem
: Set your 10-inch enclosures onto speaker stands or elevated surfaces. Position them slightly forward from where microphones will be standing to avoid creating feedback loops. Impedance Matching
Short, practical checklist before sale or gifting
The QM4 is a "powered head," meaning it combines a mixer and a power amplifier in one unit. Power Output Ensure speakers are connected to the "Powered Output"
Set channel and Tone to the 12 o'clock (neutral) position to start. C. Adjusting Levels Slowly turn up the Master Volume .
operates as a self-contained public address (PA) head. It combines an analog preamplifier section, channel equalizers, a built-in spring reverb effect, and a 100-watt power amplifier into a single, cohesive unit. It is commonly bundled with two companion 2-way passive speakers, such as the SoundTech C100 enclosures . Key Technical Specifications 100 Watts RMS at 4 Ohms load impedance. Input Channels: 4 independent, modular mono channels.