Well right now I only have a memphis mcd500 so the two 12's are only getting around 250 per sub. I borrowed a friends cadence daytona 1000 and put that in my truck for a while but I still wasn't too impressed with the kappa perfects in about .75ft^3 per sub with polyfill. This is why I want to go with a single ported setup running off of the memphis amp until I can get a more powerful amp. The problem is I'm away at school now and won't be able to make good money until I come home for the summer. But I can buy the sub soon and wait until summer to make the box/buy the new amp.