M&K MX-5000THX Subwoofer:
Active push-pull subwoofer; two 12" drivers, 400 watt rms built-in amplifier, two RCA jack line level inputs, input level control, low pass crossover frequency (36 dB/octave) control adjustable 50 Hz - 125 Hz, phase switch, THX - non THX switch, switch for use with one or two subwoofers
Dimensions:
23"H x 15 1/2"W x 23 1/2"D; weight 115 pounds; $2,495