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I'm not so sure they would underpowered with 300wrms. At one time I was running these same subs with that same amp, and they did all right considering what they were. When moved up to a 600w amp, the difference was not all that great...

I have a couple of infinity reference 12's lying around that I was going to put in my wife's car 'till we get some other priorities taken care of. These things are 4ohm single voice coils. My amp options for now are an infinity 311a mono amp giving 300Wrms at 2 ohms, or a hifonics tx4005 two channel...

I'm going to be building a sealed box for two 12" kappa perfect 12.1's. Infinity reccomends 1ft3 per sub, but has anyone here had better results with something else?