does anyone has any experience with infinity amps im want to know what u think of the infinity ref7541a its 111x4 at 40hms is it any good im trying to find something to power rainbows slc (coming soon) on the front and mb quartz discus series(already working but too weak for type r's) in the back i was also thinking of the ppi dcx 600.4 but i heard it overheats and thats exactly why im getting rid of orion 4004 cause it overheats so any other options accepted thank you