Amtec - 2.1 Channel Subwoofer .

Audio Channels: 2.1 Setup (1 Central Subwoofer + 2 Satellite Speakers)Peak Power: P.M.P.O (Peak Music Power Output)Dual Power Modes: Supports regular AC mains electricity and DC-12V alternative powerSound Enhancements: X-BASS boost technology with 3D Real Sound stage modeling