Bass independent regulation: Bass signal output can operate independently, in addition to operating outside of the volume but also on the bass amplitude range fine-tuning. The discrete subwoofer output is controlled separately from the stereo output, with controls for level adjustment and crossover adjustment found on the amplifier's face High and low volume actuator: May be appropriate to adjust your style effect according to your needs for sound effect Aux Auxiliary Input: Audio source connectivity is provided via a front-mounted stereo 3.5 mm jack, or a stereo pair of RCA jacks on the rear of the amplifier, to external phone, DVD,CD, MP3, MP4 Blue-ray drives, notebook, PC, Tablet PC