The CI-HV15P is a high velocity passive subwoofer designed for critical listening and home theater use capable of uniformly energizing rooms approaching 500 sq. ft. Employing the same advanced tuning technology as our CI-HV10 and HV12, the CI-HV15 produces extremely-fast rise and fall bass dynamics with ultra-low distortion. The increased vent air velocity creates an intense pressure wave providing cutting edge dynamics and power to explosions, complex bass passages and large orchestral works. Also available in a 500 W amplified version (CI-HV15).