Help -- my system is too bright

Your system may now be so good that it's revealing how many bad recordings there are. After all, that is your system's "job-1". It's amusing when someone suggest using this-or-that tweek to make the sound "warmer" or whatever.
If a recording sounds bad either accept it or find a better one.

The Yamaha is not a good choice with the Krell, It is, as all universal players are: A little to universal sounding and your Krell can reveal poor upstream source with ease. I have two Krell amps and went through the same thing.

Now, this brings up another point. Already, some posters are counseling cable and power cord adjustments to give this system ___. This, IMO, is how people get
duped into blowing a lot of unneccessary money on cables.
Cables will not produce ___ in speakers that are not built to accomodate it.

This the Krell sound that I also experienced - hyperdetailed. I SHOULD have experimented with various cabling & tweaks before selling the amp for something different, but I *thought* that I knew better. I didn't listen though & now I wish that I had. Because that *next* amp, while not sounding hyperdetailed, exhibited some other issues, as did the next one & the one following that.
Possibly a different amp (but only possibly) yours may synergise better when everything else is tweaked in. I would approach the fine tuning issues by trying & applying some tweaks instead.
Here are some possible examples:
cones under your speakers
Speaker cables.
Interconnects.
Upgrade AC cords.
AC line conditioning.
Shelving.
Cones.
Footers & Pods.

If you have tried the Cardas Golden Reference interconnects but you still get the harshness and/or brightness then you should consider Shunyata Black Mamba or Python power cord and need to use Black Diamond Racing shelves or cones to eliminate the brightness. Good luck.

Dweller --

There's no doubt the Krell's are exposing some bad
recordings. They have also given new life to others.
So far, it has been a nice trade-off.

Bob --

I just ordered the Balanced Power Techonology
BP-3.5 [About 30 minutes ago] to clean up my AC,
so hopefully, I can eliminate dirty AC as the problem.

Sogood --

Excellent point. The Universal player is definitely the
weak link in the chain. I've been mulling over CD
players. Suggestions?