Originally Posted by sdv5
Given that your speakers were disconnected or you disconnected external amps, then most likely the pre-amp section is clipping and it causes the receiver to shut down. If you could measure the pre-out voltage at that exact moment, it would probably be close to clipping. I suspect the other receiver you tried did not have the pre-amp section that clipped under the same conditions. It is possible that Yamaha would be sending close to maximum pre-out voltage to your external power amps, and would probably drive them to rated power already.
Take a look at this review:
"My personal criteria for amplifier gain structure is that it should be able to hit full power when driven with 2Vrms. The RX-A1010 was able to deliver 2.8Vrms unclipped out of the analog multi channel outputs. Once I exceeded this output level, the auto protection circuits shut the receiver down. This is more than enough clean output voltage to drive any audio amplifier to clipping."
I suspect RX-A830 and RX-A2030 would measure close to RX-A1010. So it appears that this behavior was confirmed 3 years ago by measurements. It is possible that Yamaha technical support will provide you with similar response.
Edit: In case I wasn't clear, this behavior is by design.
Thanks for the article. I suspect this is exactly what is happening. Too bad I don't have the equipment to measure the voltage of the output. I would be really impressed and surprised if it put out more than 1V. I'm surprised to see the measured 2.8V, if I'm understanding correctly looking at the A1010 manual I see that the audio outputs are rated a 1V. The manual of the 773 lists the sub output to be 1V however does not list the rest.
Yes you were very clear, I figured it was likely working as designed as the issue exist in many of their receivers over a period of time. I just can't say that I agree with the design. I've never been aware of anyone else putting a clipping protection in the preamp, however I may be behind the times. I have never seen another receiver behave this way. I've seen enough amps and receivers shutdown due to thermal protection or shorting out.
Sebberry, I'm actually not driving high SPL levels, I'll get in more detail below. And if I turn it down I have to turn up my NAD to compensate which introduces noise into the equation. So far it would appear by my poll that at least 3 other people run their receiver at +7 or above.
1. Speaker impedance setting should not have any effect as no speakers are hooked up.
2. SPL would likely be close to 0 since i'm not using the amplifier section of the receiver and preamp output wont be able to push much out of speakers. Yes, I'm aware there are some very efficient speakers and can probably get a little sound out of a pre-amp, however I'm not trying to achieve this.
Brwsaw, actually my room is pretty small. I have not put my SPL meter on it, but I'd say I'm probably in the high 90's to low 100's SPL. The reason I want to crank the vol so high on the Yamaha is because I can hear a slight hum in my speakers when my NAD is above -5 so I usually like to have it about -20 to -10.