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I'm actually going through what sounds like (pun!) the exact same problem on my Eheim 2217. It was humming too loudly for my living room and occasionally knocking a bit. I put my hand on it and could feel that it was also vibrating much more than my other 2217.

The only thing that would cause the vibration in an Eheim (and I'd bet for you as well) is the impeller. I'm convinced that the shaft has been warped, probably by the filter being moved around while it's running. I've ordered a new impeller and shaft+bushings, and will be replacing them soon. If it solves my problem I'll be sure to let this thread know.
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