Multiple source options: AM/FM/Bluetooth«/Aux 10" dual-coil 4-ohm Subwoofer in fitted enclosure High-efficiency full-range Class D 400w two-channel amplifier and 400w subwoofer amplifier Includes fitted interface and dual-amplifier harness and amplifier/speaker mounting brackets Included speakers are high SPL 8", compression horn speakers with roll cage mounted enclosures; Included amplifier is a compact, Class D, 400-watt amplifier. AUDIO PKG STG 5 X3