I think the PDX1.1000 is better than the MRD m1005 anyways. Tons of power for such a small amp, and they are very efficient so long as you don't work them too hard. Plus I heard a rumour that even though Alpine said the MRD m1005 was 2 ohm stable it really wasn't and some of those amps would fry up if you tryed to get 2 ohms out of them.