Good 15 inch or 12 inch sub + amp?

[Komsan6063]

Im a college student and currently i have a 2009 honda civic with a dts 1000.1 re audio amp with 2 12 inch RE audio SE series subwoofers. They hit very nicely. Im looking to spend around 600 dollars on a 15 or 12 inch sub that hits very hard and also a good amp that i can put in my spare tire well and then put my other 12s on the sides of it. Im looking to spend 600 on the amp plus the sub as i want to leave 400$ aside for instalation and boxes for the new sub and the other 2 12s. Does anyone know of a good combo that would really pound for around 600 +- 100$? Thanks

[SMS]

Are you trying to run your re subs plus 2 more 12s

[GVP]

Run one nice 15" in correct box and ditch the idea of using the pair of12" subs with it as a combo

[DoesDad]

Sell ur pair subs and get pair 15"

There ya go! What you're attempting to do OP is mix and match sizes and models. It's not a good idea and it's been discussed ad nauseum. The thing to do if you want more output is what GVP suggested. Sell your 12's and get a pair of 15's. What you were attempting to do kind of tells me you have enough room to do this.

[SAbass15]

Run one nice 15" in correct box and ditch the idea of using the pair of12" subs with it as a combo

Very true. I have a single 15 in a custom ported box @32 hz and it hits so much harder than my old 2 12s. Go with a good 15 you will be very satisfied.