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The power amplifier heat sinks are made to be oriented horizontially. Mounting the receiver on its end will not allow cool air to drawn in the bottom and vented out the top properly and will shorten the life of the unit.

Doubtful it's a grounding issue. The safety ground is just that, for safety purposes. It really has no impact on system noise unless you have a ground loop hum. Is there some new appliance located nearby that is turning on and off? Alot alot of people (myself included) often experience a pop in...

If it happens in all your speakers it's more likley to be a receiver problem

You should be able to insert an RCA only slightly so the shield is not connected without hacking a cable. I have read of others with similar problems with subwoofers and it would be interesting to diagnose. Somehow your subs amplifier is demodulating an AM or FM transmission. Unless the...

This is interesting. Is there a input crossover and gain adjustment on the sub and if so where are they set? Does adjusting the crossover or gain have any impact on the interference? Try plugging in the sub cable only partway, connecting only the center pin and not the shield and see if...

Take advantage of your setup. I don't believe your unit has PLIIx, in which case I would use THX ultra 2 cinema mode for all sources except unflagged DD-EX movies. In the case of unflagged DD-EX sources switch to the THX surround EX setting. There should also be a THX ultra 2 music mode for...