I have three of these subs, $50 each. Great sounding corner sub. Specs:
The SB-2 slot-loading vented bypass subwoofer is specifically tuned to compliment all full-range Control Contractor Series systems. This subwoofer features a unique concept in passive attenuation called the Load Baffle, a special geometric combination of rigid and pliable materials. The SB-2 has stereo inputs and high-passed satellite outputs.
38 Hz to 160 Hz frequency range (-10 dB)
340 watts continuous program power capacity
100 dB sensitivity (1W/1m)
8 ohms nominal impedance per channel
Dual-slope 80 Hz and 160 Hz low-pass crossover to woofer
160 Hz high-pass crossover to satellite outputs
Vinyl-covered particle board enclosure
Spring-loaded input terminals
Dimensions (HxWxD): 394 mm x 585 mm x 343 mm (15.5 in x 23 in x 13.5 in)
Net Weight: 19.1 kg (42 lb)