I currently have a custom box for 3 12's with a 1700w max power amp that does 850w rms @ 2 ohms and is 2 ohm stable....what kinda subs should i get to replace my old 12's.....i really like the RE SR 12's they are 300w rms dual 4's or the dd 2512's....not sure what rms they are now...but i know they are dual 4's...i was thinking they are 750w rms...i cannot think of any other subs i like...maybe some mmats subs or something...my box is 7 cubes ported with subs facing up and port firing to the back on bottom..thanks