Summary: You can't beat the prize! I am satified with the quality and sound. I got 6inch on the back door and 8inch behind the seats. They rock! I use all with 900 pioneer amp. Coil last for long time before you smell it.
Summary: Replaced the factory Harmon Kardon subwoofer in my 2000 BMW M Roadster with this driver. Most people advise that you spend $60 on something much higher end. Others go the route of replacing the factory enclosure altogether, spending upwards of $800, and that's with a "group buy" discount! This speaker is performing quite well so far. I'm not asking much of it, just keeping reasonable/normal volume and bass levels but it's just right, in my opinion.
Summary: Used it for a drop in replacement for the center subwoofer in my 2002 BMW Z3, it fits in the tight factory speaker box without any modification, it literally was a half hour install. The sound is as good or better than the original, your not going to rattle the car next to you but for $25ish it works for me.
Summary: You honestly get what you pay for with this one. I wasn't expecting jaw-dropping bass hits and I didn't get any. I bought it as a replacement for my 2005 Wrangler center console. It sounds better than a blown speaker....that's about it. 4 stars for the price and the fact it hasn't blown yet.