My Emotiva LPA-1 drives the M80's to levels I cant stand without showing any sign of shutting down. I have read that the XPA series are class AB and not H like the MPS so the power supply may hold up better to the 4 ohm load. I will be upgrading to the XPA-5 as soon as I can. Not that I need it!

M80,VP150,QS8,ERD-1,XPA-2,XPA-5,UMC-10,PS3,XBOX360,Dish VIP622,PB13 Ultra,Panasonic PT-AE3000U