JB, even those who like to create imaginary sound flavors for receivers would put the HK in their "warm" list rather than their "bright" one, so you can disregard what you read on that point.

If you have EZEq off, that can't be part of the problem, but you might try the EQ process on the chance that it would help(which some users report)rather than hurt.

As was mentioned, Re-Eq is a proprietary THX process to reduce high frequencies in some movies which sound excessive in home listening. The 635 isn't THX and doesn't have it, but applying some treble cut with the tone control on offending material has a somewhat similar effect.

If you've checked carefully enough for a damaged tweeter(my first suspicion), it would appear that some of the material just has too much treble for your listening room(or you should listen to your wife and turn it down).

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Enjoy the music, not the equipment.