The CI-HV15 is a high velocity passive or active (500 watt amplifier) 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.