Clarion SRV314 6.6-Inch Counter Drive Active Amplified Subwoofer Dual-Voice coil 120 W high power amplifier with low pass filter Maxx Bass circuit for virtual bass enhancer 6-3/4? counter drive woofer with dual-neodymium magnet Air compression structure with aluminum die-cast enclosure Remote control for gain control /low-pass filter (selectable 50/75/100/120 Hz)/phase select Blue LED power indicator RCA line level input/Speaker level input 6.6" Counter Drive Active