Integra, (the beefed up Onkyo) has a setup menu where you can select 4 or 8 ohms. I run the DTR 7.2 and love it. All the features of Onkyo with better performance. I highly recommend this receiver. I run all NHT and a friend of mine has the DTR 5.2 with NHT 2.3's and it runs with ease. Good luck.
-Kevin
-Kevin