Ok its not mine but my friends system. He bought it used from his brother and its sounded good then and was loud then,but now he just got it hooked up in his truck and it sounds like sh1t ..i mean it dont get loud at all it literallly sounds like around five 6x9's playin free air back there....What could be wrong? Subs arent blown or anything. Box is sealed Fiberglass....Possibly a wiring problem.
2 of these subs
http://www.cardomain.com/item/ROCP210S4
This amp
http://www.cardomain.com/item/ROCP3001
Assuming you left everything the way it was and installed it in a new vehicle, I'd say it probably has to do with the h/u also assuming it's a different h/u. You didn't provide those details though. It's definitely a frequency problem, you just need to figure out if it's the h/u or if it has crossovers, if that's the problem.Settings should be good besides gain perfectly set,There are 2 subs i said both in a sealed Fiberglass box that was made for the subs,Dont know about xover, and i have no idea how they are wired yet but maybe thats the problem