i have a 10" alpine sub in the wickedcas enclosure that has already been linked in this thread with an alpine amp. i think it sounds great. i personally like my bass tight. and the box doesnt use any additional space in the trunk, which is great, giving it a really clean look. although its very misleading when you hear the sub from the outside with the windows up. it doesnt sound like too much until you're sitting inside and itll shake your scalp. its more than enough for the cabin space. hits much harder and tighter than a powered sub, which i also had installed prior to the sub/amp configuration. but the best thing is to find something that you like. just my opinion.