Class AB Car Audio Modification Four 4 Channel 12V High Power Push Bass Stereo Amplifier, High Sound

Power and wiring: connect the power supply with the 12V to the level positive electrode, and join the negative pole of the ground wire and the level together. The control line should be tied to the car key control power or to the sound/subwoofer remote control line. The unit will power on automatically; a blue light indicates normal operation and a red light signals a speaker short circuit. Volume control: a rotary volume potentiometer is provided to reduce or increase output level smoothly. Frequency/bass selection: set the mode switch to the bass position to route output to bass only. The bass potentiometer adjusts the bass frequency to suit different listening preferences. Tone shaping: separate treble and bass potentiometers allow you to fine-tune treble and bass response and alter the bass effect.