Half-DIN, ISO chassis mount; 4-band equalizer & line driver; For mono or stereo subwoofer setups; Dual inputs with level matching; Perfect for add-on MP3 players; Built-in 9V line driver; Front-to-rear dual-amp fader; High-pass F/R crossover: 12dB slope; Mid-bass 2.2kHz midrange, 12kHz treble; Master volume & subwoofer volume control; EQ controls with 12dB of boost or cut @ 45Hz sub-bass, 120Hz; Selectable subwoofer output: 50Hz/80Hz/120Hz @ 18dB slope; Selectable blue or red illumination;