Well I got these as a hand me down since my parents got a home theater setup to replace their old malfunctioning gear. I got two Marantz speaker cabinets and two Realistic Radio Shack specials. The woofers in the Realistics are hosed, the cone basically crumbled away I guess. So I'm looking for an 8" woofer to replace the busted ass ones, and I came here seeking recommendations. I took some pics of the speaker cabinet it came out of, it's vented at the top for the woofer. The edge that the speaker mounts to are a quarter inch deep on the enclosure. The box is 19" tall and about 6" deep on the inside so there's plenty of mounting depth. One of them is next to a TV so something shielded is needed I suppose. I'm not an audio phile by any means, but I would like something with decent bass for about $40 a woofer that I can hook up, screw in, get decent sound and not worry about blowing out. The speakers are all hooked up to an Optimus receiver (another Radio Shack special ), which I know nothing about. The two Marantz cabinets really lay down some bass though, so I guess the receiver can put out a decent amount of power (I don't have the booklet for it, so I don't know anything about amp power, etc). My only gripe about the Marantz's is they don't have a very clear treble output, which the Realistics actually did better. Pics of the busted ass units: Thanks guys.