I have a pair of alpine type R, DVC 12" subs 1000w each in a twin carpeted box £180.
Kenwood powerslide 1600w mono block amp with built in fans (runs the alpines sweet) £120.
JBL 4 channel amp £50.
Infinity reference components,mids,tweeters and crossovers 5" & 6" £50 each set.

All this was in my s2 then it was in my cossie and it rumbled,very low,deep bass.