Alright I have a SVC 4ohm Solobaric S15D (circle model)in a sealed 1.5cuft box and a Kenwood KAC-8101D amp (200 at 4ohm and 400 at 2ohms)and a Panasonic 8300u with crossover,eq,sub out.I have no rearfill so what else could I do with my current setup to improve it.I don't have much money to upgrade I just want something minor stuff that would make a big difference such as sub enclosure,tuning,and somethings you guys tried that worked