Seven equalization bands (50 Hz, 125 Hz, 320 Hz, 750 Hz, 2.2 kHz, 6 kHz and 16 kHz), each frequency adjustable from -12 to +12dB (-15 to +15dB for subwoofer frequencies). The subwoofer output uses a built-in 18dB per octave electronic crossover fixed at 60Hz or 120Hz. Three stereo RCA outputs to control the front, rear and subwoofer audio amplifiers. An auxiliary stereo RCA input for use with portable devices such as an MP3 player or DVD player. Separate controls for master volume, subwoofer volume (secondary level), fader for front/rear and selection of main or auxiliary inputs. Extended frequency response from 20Hz to 30kHz with exceptional 100dB signal-to-noice development. Gold-plated RCA connectors to ensure the best audio signal output. ISO mounting holes and removable adjustment ring for custom installation.