I'm going with a sealed setup. Alpine recommends 1.0cu/ft sealed, but that seems too small. Will the R perform in 1 cube? I'm going to be running 2 Type R 12's in common chamber sealed. Will they get pushed pretty good with a BXi1208d? All I care about is efficiency mostly. That is why I'm considering P3's or RSDc's off this same amp because I think they will get pushed harder than the R's? I don't want get a bigger amp so lets stick to what this Hifonics can do. Most on here are recommending at least 800 rms for the R's. I expect at least 1000 rms @ 1ohm with the Hifonics, and people say they are nothing special with 500 watts. Is this true and should I choose the others over the R's?