Ensure all audio cables are separated from electrical power lines to avoid induced EM hum. Check for faulty lines by swapping out cables one by one.
: Adjusts the initial input sensitivity of the incoming audio signal to prevent distortion.
: Includes a 3-band EQ, master reverb control, and a master level slider. audio choice qm4 manual
: If connecting one passive speaker, ensure it has an impedance rating of 4 ohms or 8 ohms .
======================================================================== | [CH 1] [CH 2] [CH 3] [CH 4] | [MASTER SECTION] | | (XLR) (XLR) (XLR) (XLR) | [Low] [Mid] [High| | (1/4") (1/4") (1/4") (1/4") | | | | [Master Reverb] | | O Gain O Gain O Gain O Gain | [Master Level] | | O Tone O Tone O Tone O Tone | | | O Reverb O Reverb O Reverb O Reverb | [FX Send/Return] | ======================================================================== 1. Stripped Channel Strips (Channels 1 to 4) Ensure all audio cables are separated from electrical
: Each channel features an XLR microphone input and a balanced/unbalanced 1/4-inch Line input jack . Do not connect sources to both inputs on the same channel simultaneously.
High-performance BMR (Balanced Mode Radiator) drivers for wide sound dispersion. : Includes a 3-band EQ, master reverb control,
: Controls the input sensitivity to prevent pre-amplifier clipping while maximizing signal strength.
: Ensure you are using unshielded speaker cables , not shielded instrument/guitar cables, to connect the head to the enclosures. 3. Scratchy Noises When Turning Knobs
The is a vintage-style 4-channel powered PA mixer designed for portability and ease of use in small venues, karaoke setups, or band rehearsals. While official printed manuals are rare today, the system's straightforward design makes it accessible even without documentation. Key Specifications & Features
Given the rarity of the official manual, your best support resources will be the vibrant online communities where QM4 users have shared their knowledge over the years.