It seems that you have a low Hz feedback loop between the speakers and the tonearm/stylus.
Usually it's only a visual effect and very little can be heard.
In the old times there was a "subsonic" filter in the phonostage part of the amps to cut this out.
You could try a different placement of the turntable as this phenomenon is induced by airborne vibrations and a different placement could ameliorate this interaction...
SOURCE: Creek 4040 Amplifier blown some speakers ?
I would suggest not using the amp before the problem is sorted. It may damage your new speakers :)
If you still have issues, is the problem there on both channels?
If it is then there may be a power regulator issue.Is there a DC offset on the left and right speaker output(check with a DVM).
You can find a schematic here.
I am happy to talk to you more about the problem. I would need to talk a bit further with you, just ask away in here.
regards
graeme
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