Using heavy-gauge unshielded 1/4-inch TS speaker cables (do use thin instrument patch cables), connect the rear speaker outputs to your passive PA speakers (such as matching SoundTech C100 units).
head to the inputs on each speaker cabinet using unshielded, heavy-gauge speaker cables. Do not use shielded instrument cables for speaker connections. audio choice qm4 manual
The Master Section sums the inputs together and dictates the final output behavior before the signal strikes the internal power amplifier: Using heavy-gauge unshielded 1/4-inch TS speaker cables (do
Check that your source instruments are using shielded instrument cables. Unshielded speaker cables used as input paths act as antennas for RF interference and electrical hum. audio choice qm4 manual