What are you running the Cambridge 540p through?
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I've done some further testing with two other systems and determined that the issue is not the phono preamp. The turntable is picking up some kind of vibration/resonance and that is causing the rumble. Has anyone experienced this and have any suggestions as to how I might eliminate 80/90% of this? The tt itself is suspended inside a walnut box. The box sits on some legs with felt at the bottom. Is it a more mass thing ( this is based on the fact that higher end tt weigh 40+ pounds? Is it a vibration isolation thing? Any advise would be great?