I used my Denon receiver with my Dunaudio 70s for awhile. The are rated at 4 Ohms but dip to 2 Ohms on occasion. Although the Denon did not shut down it got very hot and has no fan. Once I switched to M200s and used the Denon as a pre-pro, the sound was marked improved and the Denon cooled off. The M200s were a great buy and I will keep them a very long time. You will be pleased with your decision. Let us know how it goes. Good luck.