Pioneer TS-SW841D

I installed two 8 inchers in the back of a street rodded 1936 Graham and was utterly impressed with the sound quality of them. No one believes me when I tell them that they are only 8 inch subs.

Great subwoofer for regular cab pickups. Surprising bass from such a small sub.

I had this installed in my 2008 Civic SI with hopes it would be a straight swap for the stock sub but it wouldn't fit so in the end had it bolted from underneath with some MDF.
So performance of this sub is impressive for its size, used with a 200 watt amp I had lying around, with some deep bass that's just enough but not overpowering.
The best part is I still keep all my trunk space. I would defenitely recommend this product to anyone looking to upgrade an existing 8" sub but concerned about maintaining trunk space.

The very good

I'm running one of these in my system which is sending 300 watts RMS bridged mono from an old school PG XS6600 amp. Sounds fantastic, though I warn you I'm an adult listener and have the levels set properly. Most kids don't know what their doing and set the levels too high. Rattled sheet metal at stop lights comes to mind. Yes this can rattle the sheet metal but I have my gains on the amp properly adjusted and the level is set on my subwoofer level control to the correct level. If your interested in setting your level correctly, you should adjust the level down until you can barely tell if it is present, this takes a well trained ear but in the end you'll find it more of a satifying listening experience. This is a great sub if you are interested in keeping your trunk space for groceries and want the sub to play strait into your cabin. If your planning on installing these in an enclosure in the truck with no direct access to the passenger cabin I would recommend going with two of them. The main thing is they can handle the high power and sound good too.