I had 2 P3's in a ported box being pushed by a Hifonics 1000 Watt Class D Amp, that seemed to be the sweet spot. I love these subs! Had them in my Acura TL, then after 4 years moved em to my Tahoe. After 4 years, I was consistently complimented on how hard they hit. Best low's you'll find in a 12". I would easily "beat down the block" WITHOUT turning the sub volume past -2 or -1 on my head unit. The price is just icing on the cake, I'd recommend these to anybody looking for ground shaking, yet clean sound ; and willing to get a quality Amp and a big enough box, these subs are deep, and they sound deeper. The quality of product on the Rockford Fosgates is top-notch!
Only reason I ditched these was b/c the genius at best buy accidently put a screwdriver thru the cone when I was going down from 2 to 1 sub. They gave me an Alpine Type-R as a comparable product, and I can honestly say, after 8 months, I miss my P3's.