i also agree with bernic get a 4 chanel amp for ur inside speakers and also get a 2 channel for a sub i would recomend gettign a 12" solo baric you can pick one up pretty cheap on Canal street that will give you alot fo bass if you want even more bass i would go with 2 of them. with liek a 1000 watt fosgate. its something that isnt to Expensive and will do its purpose.