Right now I got 2 10" alpine type R's in a custom made ported box by SPY. I got the ALPINE MRP-M1000 amp pushing them. It's come to the point where that doesn't satisfy me anymore. I was thinking of selling them and getting maybe a 15" FI BL15.. or maybe 2 12" type R's. Will I see that much of a difference if I still use the same amp?