relies on analog circuitry, keep it away from direct moisture, spills, and poorly ventilated, enclosed racks. Periodically clear any dust from the rear ventilation slats to allow the internal heat sinks to cool down the integrated power amplifier under high-demand live use.
The engineered primarily for gigging musicians, mobile DJs, karaoke hosts, and small-venue sound reinforcement. If you have acquired this classic analog workhorse without its original documentation, navigating its front and rear panel operations is essential to optimizing your live sound. This comprehensive operational guide serves as a manual to help you configure inputs, balance frequencies, manage power outputs, and troubleshoot your system safely. Hardware Overview & Front Panel Layout
Connect your microphones via XLR or line-level gear (like phone/laptop adapters or instruments) into the 1/4-inch jacks.
Low-impedance mic connection for dynamic microphones. audio choice qm4 manual
First setup — get it playing fast
Maintenance & safety
: Each of the 4 channels features combination XLR and 1/4" ports. Channel Controls : Individual adjustments for: Gain (Level) Tone (High/Low EQ) Reverb relies on analog circuitry, keep it away from
: Power down the unit. Spray a specialized electronics cleaner (like DeoxIT D5) into the gap of the noisy potentiometer. Spin the knob back and forth rapidly 20–30 times to clear away the debris and restore an ultra-silent signal path.
(often configured as 100W RMS), this system is built to provide clear, reliable sound without the complexity of larger professional rigs. Key Hardware Specifications Power Output : 100 Watts at 4 Ohms. Mixer Inputs : 4 discrete channels, each featuring both XLR and 1/4" inputs Portability : The mixer weighs approximately
blends an analog layout with built-in spring reverb and master tone equalization. If you have acquired this classic analog workhorse
: Turn up the channel Reverb knob to decide how much of that specific voice/instrument goes to the effect, then use the Master Reverb knob to set the overall "wetness" of the sound. Typical Applications Small Gigs/Coffee Shops : Ideal for acoustic duos or solo performers.
Since "Audio Choice" is not a widely recognized major brand for professional audio equipment, it is highly likely you are referring to a , QTX QM4 , or a generic 4-Channel Stereo Amplifier often sold under various brand names (like Adastra or Velleman).
: Confirm that the Master Volume knob is turned down completely. Plug the power chord into a grounded AC outlet. Flick the power switch on; the front-panel LED power indicator should illuminate. Channel Strip and Input Controls The front panel of the Audio Choice QM4 Go to product viewer dialog for this item.
Dual 2-way 10" speakers with performance-rated horn tweeters Hardware Configuration and Setup