The HTS4B home theater subwoofer is equipped with one active magnetically shielded 12" driver mounted on the front of a compact cabinet and two 12" passive radiators, one on each side of the cabinet. The 400W amplifier unit is integrated in the subwoofer cabinet. XLR and RCA line level input connectors and adjustable input sensitivity provide easy connection to all types of decoders. Bass roll-off rate and crossover phase can be adjusted to suit different acoustic environments and subwoofer positioning.