Ok guys,

My box setup is around ~3.91 cF @ ~32.5 Hz.

Anyways I have a highoutput alternator and a MB Quarts amp 1000watts 1ohms. I have the kenwood X589 deck.

I had a w7 13.5 before. The 15" XXX is much better at lower volumes it slams its not even turned up high. At High volume its so loud, I can't even imagine giving it at least 1600-1800 watts. It pushes so much air not even funny. At high volumes the AMP can't really run the XXX, so I will upgrade to a better amp. I need to get metered. Its pretty loud much louder then the w7 13.5 I had before. I love it. Plus my car doesn't rattle much unlike other cars rattle so much..

15" XXX is a great deal at around 450ish. Along with the right amp and power requirements its nothing to be take lightly!!!

hope this helps.