The AVA1204 is a high-fidelity signal processor/preamplifier that that allows you to graphically view and individually control a number of different frequency bands in a stereophonic system. It is intended for use in a car audio system which includes amplifiers in the signal path after the equalizer, and provides front, rear, and subwoofer low level outputs via RCA connectors. The AVA1204 consists of several audio filters, each centered at a specific frequency in the audio range. It enables you to cut or boost the output level by up to 12 decibels as desired at the following frequencies: 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6kHz, or 15kHz. In addition, the subwoofer channel level can be controlled independently and either 50Hz or 150Hz can be selected as the center frequency for the bass level control.