Acoustic Audio HD-SUB15-CHERRY 15-Inch HD Series Front Firing Subwoofer (Cherry) 15" front firing long throw Kevlar Cone subwoofer with Aluminum Voice Coil Former 500 Watts RMS and 1000 Watts Max built in digital drive high efficiency amplifier producing detailed accurate bass response Line level and Speaker level inputs Signal Sensing On/Off switch and bass level/gain control Advanced RFL Bass Reflex cabinet design using non-resonant high density MDF