DaveInDenver
Rising Sun Ham Guru
@DaveInDenver, I think you're right that the hollow resonance is inherent to the turntable. Here's a video of what I'm hearing.
What would be the relative volume of that? I mean, like "Is it live or is it Memorex?" level there? That's worse than I'd call mine, which is low enough frequency whomp kind of sound that correlates to 1 RPM on the platter. IOW, it's probably a slight out of round on that bronze bushing or spindle.
Yours I'd have thought as electrical hum first but that would be present and probably would change when you put your hand on the arm. But none-the-less I'd personally check the wires on the cartridge are snug and in good shape. Perhaps also make sure it's wired right (e.g. colors match on the wires and cartridge). There's a left and right signal and ground and if one's reversed I wonder if that might make a ground loop or phase issue. Just thinking aloud there.
Do the easy stuff: spindle oil, new belt and maybe new motor suspension. And if it's still there and bugs you (it's impossible to unhear things!) your solution might be ask Santa for a new TT.
BTW, you might flip your spindle and make sure it's like mine. Pro-Ject builds a pretty nice table on the top side with your carbon arm so they might have improved the drive since they made mine.
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