looking for suggestions for upgradeing from my 1 havoc 15 to 2 12s or 2 15s or even 1 18....my budget is about 300$ ...im looking at some obsidians right now.....just looking to be louder than what i got now.....right now im running a 220 amp singer alt...1200 rms hifonics brutus amp and 1 havoc 15 in a 08 grand prix...had it db tested this morning and it hit a 143.1......sub and amp are for sale ...basket is broke on sub but still runs well....about 3 months of play...with proper break in.with box..250$ 150 for amp...its 1 month old