Distortion on piano recordings? Advice appreciated


I'm not sure exactly where to put this, but I guess amplification is as good a place as any.

For several months now I've been occasionally noticing distortion (fuzz) in my system, only on some piano recordings. It seems to happen when they get loudest, or when the note attacks seem most intense even if not that loud. It's only at mid-high frequencies (not lows or extreme highs). Seems to be the front channels only-- I plugged my surround speakers into the front channels and heard it then too.

In that time I've changed all my components (amp, processor, CD) except the speakers, and I have tested other pairs of speakers and interconnects with the same result, though it's perhaps less obvious with RCA ICs than with XLRs.

I'm pretty sure I've also swapped out speaker cables too, though not lately. I'll try different speaker cables again this weekend, but assuming it isn't them, could it be a room node? I don't know that much about nodes, but I thought they were usually problems at much lower frequencies. Can this be this severe in the higher ranges too?

Is there anything else I'm forgetting?

System:
Halcro MC-70 Amp
Classe SSP-600 Pro
Hyperion HPS938 speakers
Aurum Cantus Leisure for surrounds
NAD M5/ Parasound players
Audioquest ICs and cables
apspr
Do you hear it even at lower volume levels? Might be on the recordings. A lot of sixties-era jazz recordings seem to go into overload on piano.
Thanks for your response-- I think some of the recordings could be prone to moments of overloading, but these are classical recordings of the last 10-12 years, so I doubt that's the whole answer.

Tim
have similar problem with some recordings....I took my CD in to a store and listened on their speakers (Sonus Faber) and the issue is still there...
I think it may be your amplifier 'clipping' as it runs out of power? The piano is one of the most dynamic of all musical instruments and the differences between ppp and fff are just about the greatest dynamic shift you can get in a recording.
You didn't seem to answer Drubin's question about it occurring at very low volume? If the distortion is still there at very low volumes, then it is NOT the amplifier clipping.