Pianonut says about Bob "he tends to like journalistic titles."
I do?

Bernhard says "There you are! Incontrovertible proof!"
Can't argue with that. And Bernhard agrees too.
I've heard this, and yes it's probably more an ensemble issue. However....
you don't think practicing a grand piano in a tiny piano room won't have any affect do you?
When does it affect you? A little right away and some later on (when you're old). The little hairs (celia I think) in your ears don't bend anymore -- you can't hear higher partials -- so you don't hear tone quality the same way. Yes, you can still here, but the quality is lower. And once it's happened there's nothing you can do about it. And it will happen naturally anyway from what I've heard. You're hearing will detoriate (along with the rest of your body). Pleasant huh? But your ears will go faster if they get pounded with loud sound a lot.
The solution? Be careful about what sounds get into your ear. Are you in a loud, noisey environment? Are you putting your ears in a loud sound environment everytime you practice?
Earplugs are one way to protect your ears.
Another solution is too stay out of those loud environments or limit your exposure.
Your reward? Higher quality hearing late in life. Right now, you probably won't notice a thing. Talk about delayed rewards.
Not that you can't withstand "loud." I don't think you have to turn the volume down on everything. I do hear more things when I listen to music at a "strong" volume level, not blasting but up to performance volume. I know that isn't going to hurt my ears because it's not loud enough and it's not for a long time. It's the loudness (or intensity, whatever it is, but that idea) and the amount of time your exposed that causes problems.
I also remember hearing this...
"They" know the hairs don't regenerate, so once your hearing is gone, it's gone.
"They" don't know whether you can strengthen your ears by listening to loud sounds and resting -- the idea of building up the strength of those celia to withstand loud sound.
And that's introcontrovertible proof too!

I don't have any article or pure research. That's just stuff I've heard, from articles and a few audiologist people.