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Looks like it's a problem with sympathetic resonance like Scott said. The forums at pianoworld are littered with similar issues and not just with Casio, but Roland, Kawai, and Yamaha as well. I got back in touch with the dealer. I hope that they can resolve this somehow.

Hi Scott. Thanks for your reply. The resonance happens only with the one key. Volume changes make no difference. It happens at any volume. I tried moving the piano to different surfaces but that also didn't help. The only thing left is to change tel he brilliance, but can I do that for just one key?

Has anyone else experienced a problem with the sound output from the left speaker of the Privia px-750 when you hit the B key one octave down from center (16th white key from the left)? It buzzes quite badly-- the sound vibrates way too powerfully and causes dissonant overtones. I don't know how to describe it exactly. If you have this model in a quiet room, try it out and see if you have the same issue. Play a few chords going down the line until you hit that one B key. It should be quite jarring. I bought this piano brand new and since it's under warranty I called the service center. They replaced it with a brand new piano. The new piano has the exact same problem on the exact same key. Even weirder, on both the first and the second piano, the problem key sounds perfectly fine when you use headphones. Clearly this is a problem in how sound is modulated through the speaker for that particular sound sample. I called Casio support but they refuse to help out, saying that I should take it to a service center. I already took it to the service center and they say that if every piano has the same problem then it's just how these pianos are and there's nothing they can do. Am I the only one who noticed that the sound is way off on that one key? If anyone else has noticed this and figured out what to do about it, I'd appreciate some help. Maybe it's a software issue? Maybe there is a way to recalibrate that one key? HELP! I can't play the piano if it sounds like this!