DESC: The Pyle PLE520P 5-band rotary control pre-amp parametric equalizer has half-din size, pre-amp line and auxiliary RCA inputs, output volume control, input gain adjustments, sub output, frequency gain control, 5-band parametric control, 20 total frequency band selector, 12 dB boost/cut, rotary band control, rotary fader, volume control, 6-channel RCA outputs, fully isolated DC-to-DC power supply.