If your careful it should work. Shiva's are 350 rms I think, correct me if I'm wrong. Dual 8 ohm voice coils I think, so that would produce a 4 ohm load. I think the 801D puts out 400 watts rms at 4 ohms.
Well the shivas are 375 rms on each voice coil so that should be 650 watts for the total driver...so if your saying that the mtx should put 400 rms to the sub then I think I'm gonna get one... Thanks for the info Anyone else have any thoughts?