Originally Posted by KidHorn
I agree that it's recommended for all AVR's to have adequate ventilation, but Onkyo shouldn't have such high failure rates in conditions that would be expected from many users. It would analogous to a car manufacturer recommending oil changes every 3k miles and if you wait for 4k, you'll suffer engine failure. This may be OK for an expensive exotic car, but if ford did this, it would be considered a problem with the car, not with the driver.
Keep in mind...
Onkyo and HK both bias their amplifiers high to minimze X-over distortion, doing this causes the output devices to be partially ON..
Resulting in higher internal temperatures
from the output stage even if no signal is being processed. Though car analogies are interesting for a car to operate reliabily, proper and timely care has to be done to assure reliability..
Especially if the brand recommends these.
For example, in our 9 second 150 MPH drag race car we change the oil after every run..
But then again our 850HP race engine that we have over $65K invested has lasted through 3 seasons and over 115 runs..
If the AVR brand issues specific warnings and instructions for the user to heed while setting up the system there has to be a significant reason. Otherwise it is just more useless, hot
Just my $0.02...