...I suspect that your issue is that the speaker(s), or the amp circuit powering them, are bad in a small subtle way
Yeah; this is something that I hope to rule out by using a separate amp and speakers with the line-out.
It’s even possible that the issue is that there is a dead bug or a piece of crud lying on one of the speaker cones. Do you notice the distortion mostly from one side?
It's not obviously one side or the other, but it's only obvious when you press the key hard (aiming for forte, rather than piano), and the speakers aren't that wide apart.
...(I don’t know if it’s one of those keyboards that’s like a small stage synthesizer on a stand l, or if it’s a full piano sized thing.)
It's larger than a stage synthesizer, but smaller than a full upright. It's
this, but in black, rather than "mahogany".
I found the service manual online, which explains how to dismantle the main body, and it doesn't look like too much work to get at the speakers and inspect them for damage / bugs.
All good tips, thanks.
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