Conclusion: I bought this sub over the summer along with a Boss amplifier and a ported box from Best Buy. The reason I wanted a sub is because I had simply no low end in my car (Acura RSX), as it has four 5.25" speakers. This sub certainly did the trick. It may be because it's in such a small car, but it delivers quite booming bass and I've never even turned the amp all the way up. Once it gets broken in and tuned correctly it sounds very clean, even with my ported box.
Conclusion: Just upgraded my sound system in my jeep. Got this sub in a sealed 1cu ft box, ran by a Legacy Icon amp 1100max. Runs at 500watts rms @ 4ohm and it shakes my jeep. Probably going to look into a ported box but really happy with my first system!
Conclusion: Once the sub is broken in, it sounds clean and hits pretty nice. I am running 350 watts rms in it and the sub's max rms is 400 watts. The amp pairs perfect with the sub. But if you want real bumps, this sub is not enough. Get 2 or buy a stronger sub for more money. I don't like rattling my car or drowning out the mids and highs, so this sub is good for me.
Conclusion: These subs are pretty loud and durable as hell. For the price nothin beats em. i have had 2 in a ported box and it slams. I feel the need to get 1 15" RE but I don't think it'l hit as hard. Tight subs the Pioneers are.