Black TreVoce15EQ DSP is a dynamic powered subwoofer that offers up to 1500 Watts of power and includes a three-woofer design that dramatically enhances bass in home theaters, media rooms and high end listening spaces. A powerful sub with a small footprint, the OSD Black TreVoce15EQ DSP includes a 15” active graphite paper cone woofer and two 15” symmetrically mounted passive glass fiber woofers. The active subwoofer uses the sub’s internal amplifier to reproduce sound while the two passive woofers enhance the SPL, minimize distortion, and improves speed and accuracy. This refined balance of internal and external power relieves your main speakers from having to produce low frequency sound, allowing them to focus on mid-range and highs, further reducing distortion and gaining SPL. The result is optimal performance, so you’ll experience movie and music soundtracks with thunderous, accurate, bass authority.