I bought a Onkyo 709 about three months ago and everything had been working fine with it up till a few days ago. Then I was playing a game with the volume around -40db when all the speakers started to make a crackling sound then a very loud pop came from all of them. Then no sound at all. Tried different input sources and nothing so I figured something happened to the receiver. Took it into a shop for warranty repair and got a call yesterday saying everything is fine with it. So I grab my multimeter from work and start checking speakers and all of them are toast. I've got polk monitor 50's for fronts, Cs2 for center and monitor 30's for surrounds. They all have wildly different ohm readings. One will read 24 another 16 and so on. Pulled the drivers out of one cabinet and Checked and one woofer now reads 16 another 60 the tweeter 24. Tried hooking the drivers up seperately to another receiver and they barely play any sound. Just very low and very distorted. Does anyone have an idea on what could have caused this? Thanks for any help.