If you're still within your 30 day window, you get the full $ amount back. If not, well, you'd have to talk to Axiom.
I looked again, whether they go by ship, purchase, or date of delivery, I'm still a few days past 30. Hopefully if I am considering stepping UP to M80s they can overlook this though?
I'm fairly happy with the M60s, but I'm curious about how the extra mid and tweeter fill out the M80s. I've read that they do OK on a Denon receiver even if it isn't "rated" for 4 ohm operation, how much wattage do they need to sound good? My Denon AVR-789 is only good for ~90w/ch...