This is a nice quality Sony SA-WMSP1 Magnetically Sheilded Active Subwoofer. It features a magnetically shielded housing.
Up for sale is 1, brand New Sony SS-WS71 (From the Dav-Hdz235 set) passive subwoofer. Passive means it does not have a power plug that plugs into the wall, and must get power from another source IE: amplifier/dvdplayer. The rated Impedance of this subwoofer is 3 Ohms or 140 watts. The subwoofer Dimensions are 7 7/8"W x 12 ¾"H x 13 5/8"D
The W4-1720 4" midbass features a long throw, underhung 1-1/4" voice coil driven by a massive ferrite magnet structure.
Bazooka 10" Powered Subwoofer with Universal installation Cable
The oval shaped frame of the W69-1042 gives you the surface area of a typical 8" driver in the footprint of a 6-1/2". Perfect for constructing a narrow-baffle subwoofer, or for automotive installs in factory 6" x 9" locations.
The Tang Band W3-1750S employs a square diaphragm to maximize the effective area of a 3" driver.
Tang Band's unique W2-1625S driver features an innovative cone structure, Santoprene surround, injection-molded chassis, and neodymium magnet.
The Tang Band W6-1139SIF 6-1/2" driver will surprise and impress when installed in subwoofer systems for compact home theater systems, multimedia setups, and mobile audio installations.