I'm hoping someone else can chime in
because I'm sorry to say I don't know what's going on. Realize that Rubinstein was born a very long time ago, and that the recordings themselves, depending when during his career, can be very, very old. But, you say it's among many recordings, hmmmm.
You know, several years ago, I was listening to quite a bit of classical guitar in my pickup, and just by the nature of the instrument/recordings, it has to be rather cranked just to be somewhat audible with a high noise floor. The stock speakers sounded pretty bad, and I'm pretty sure I did something bad to them, but the funny thing was it only sounded bad with that instrument, which I then avoided putting on. Strange.