Summary: This item is exactly what I expected. The reviews don't lie. Many others are using this with many different set ups with the exact same results. I am very happy with my purchase. I am currently using a cheap amp and my review mirror still shakes with only one of these in a small ported box. Trust me this is a great investment for those who are not trying to beat down the block or get a ticket.
Conclusion: I put these subs in an Infinity Reference 1220de box (the original subs stopped working). They're wired @ 2 ohms to a kenwood KAC-9104D amp. This setup SLAMS in the back of my jeep! I would recommend maybe a custom box to go with them instead though, I think my box is a wee bit too small. Anyone who buys these won't regret it!
Conclusion: I bought 2 of these bad boys and couldn't be happier with my purchase, i have owned a few different sets of subs and the bass from these are the cleanest, i have owned a stage 2 rockford punch amp for some time now and was very impressed with it, these subs didnt fail to impress as well. I recommend these to anyone whether your on a budget or not, they are worth more than what you pay for from Sonic.
Conclusion: Great subs here, have installed two different sets of 12"s for my friends both in sealed enclosure and wow are these subs clear! Hits the whole range of sub frequency which is truly amazing for being in a sealed enclosure. Def recommend these to everyone!
Conclusion: Let me say I started with one of these at 1st becus I'm a jl audio man to heart, but jl's are becoming so exspensive now a days. I was truly amazed at the sound of one of these 12's. So I ordered another and hooked it up and I just had to have another. Yes 3 12's in a sealed box and have not been let down yet. By me in a jl audio man to heart these subs are powered by no other than jl/ series amp.
Conclusion: After modeling several speakers in WinISD, I finally decided on a single P2 12. I built a custom enclosure, slightly larger than the recommended (2 cu. ft. - minus port volume and speaker displacement). The port is (4 inch diameter, by 8.75" in length - cardboard) and tuned at around 37 Hz. Pros: This P2 sounds so much richer and deeper and louder than my pair of P1 10's in a sealed enclosure.