quality is good. They take more than rated and do get loud for some budget subs. I had 2 of the 15's in 6 cubes sealed and it was crazy loud off a jbl 500/1. Had one ported in 3.5@35hz ran off a mtx 311d and it was surpisingly loud for just that one sub and about 300watts.but as in quality?
what size/type of enclosure do you have them in?i have two 15 pr nowon a memphis mclass 1000 watt
and its good but i think its my box or my head unit that makes it sound "off"
i would go AT LEAST 2-2.25cubes per sub sealed. Leave the prefabs alone unless its made from mdf and be sure to reseal the insides with silicone just to be sure.small sealed one im pretty sure i cracked it cuz when i first got it i could feel the bass HARD in my car now i can barely and it sound whack
wat a bass pro or sub?my buddy got one in his neon, it get pretty loud good budget subwoofer and it worth the money.