I suggest you call the Outlaws to ask them. I do not think it would be a problem, I have a passive sub hooked up to one of the channels and it is 4-6ohms, but that channel barely breaks 112 dF measured with my non-contact thermometer. Overall, my 770 runs about 104-106 dF with high SPL's, but with normal listing, it barely breaks 100.

The rest of my speakers are all 8 ohms with about 89dB efficiency.