subs not sound right for some reason?

is something worng with this scean????? i have a 500/1 amp 2 JL w3 12's wired all + to all + in a sealed box runnin off a alpine headunit and the subs bottom out even when the amp is not cranked up half way..., but the volume on the headunit is at 22 out of 35 ????? are they supost to do that because i had this subs befor in my car and man they hit hard and i took them out for like 3 weeks and know they dont seem to be hitting as hard?????

Lots of questions. What is the impedance of the voice coils on your W3V2s? How are they wired? Where is the gain set on your amp? Is the bass eq on? If yes where is it set? Where is your X-over set? Is it on the amp or the deck? Does your Alpine have a bass engine sub level control? If so where is it set? I'm closing up shop now so I might not be able to answer until tomorrow.There is no such thing as free installation!

ok my voice coils are 4 ohm they are + to all+ and - to all - the gain is like half way up the boost is barly on dont know what is X-over the amp is connected to the headunit throw RCA and it is on the sub plug in there is a bass control on my deck but im not to sure how to use it but ill try to learn how to use it....

man that sux's because i think your right.... could this have happend because i wore down the sub or somehting....like it bottomes out to many times????? or idk ill talk to JL and ill stop my cartoys tomerow and ill post later again