Axiom Home Page Forums General Discussion Technical Questions Question about 4 ohms

Matt, welcome!

I wouldn't worry about the wattage. Most likely your Onkyo will be fine unless you listen at extremely loud levels for very long period of time. My Denon is not even rated for 4 ohm and I've watched movies at the 0dB mark driving M80s and a VP180. While the receiver got hot, it never shut down on me.
If you're listening at very loud levels, the only thing that you have to watch out for with AVRs is that you don't drive them into clipping which could potentially damage your tweeters.