impedance question/problem

Those speakers shouldn't be presenting any problems whatsoever to your receiver. I'm not sure how you were testing impedance on your speakers since this varies with frequencies. You might try running your receiver with headphones only for an hour or so and see if it still shuts down.

Sound like you simply put an ohm meter on your speakers to measure the DC resistance. That's completely meanless. That doesn't measure the speaker impedance. And adding resistors is not a good idea.

Ed

Threads such as this may be more common in the next few months as people start buying the latest receivers. Manufacturers are busy looking for ways to trim weight and Onkyo is no exception.

The SR605 weighs 25.1lb

The SR606 weighs 24.9lb

The SR607 weighs 23.8lb

See a trend? Where do you suppose they've trimmed the weight? My guess is they've either made the heat sinks smaller or changed the materials that go into them. Heat has become a larger issue in the past few generations of AVRs - especially with Onkyo. Changing heat materials or making them smaller is akin to car makers putting smaller radiators on their cars and hoping you don't have a problem.

What they do - as does Onkyo and others is put on the smallest heat radiating materials they think will get them out of the warranty area - after that - well - they couldn't care less after that.

Put a fan on it and let it live for a long time. Don't rely on the manufacturers "bet" that you won't have problems inside the warranty period. Chances are you won't. But beyond that it becomes your nickel and thats where you can get ahead of the game. Get one of these. If you are a DIY'er, installing a 120mm fan that comes on with the AVR is an easy job - and cheaper than buying a new AVR because the old one died before its time.

Try a small fan at the top of your receiver and let it suck the hot air from the space above the receiver. If you still have the shut -down problem - contact Onkyo and let them know.