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Need help solving a system problem

The equipment:

Martin Logam ethos
musical fidelity m6si integrated
musical fidelity nu vista vinyl phono pre
EAT C Sharp TT with a Kiseki Purple heart cart.

The issue simply put:  when I rest the needle on the record (record not playing) and I turn the volume up to the 12 o'clock position, I get an incredible amount of woofer vibration from the logans.  Same issue when playing a record. 

I've tried:
1.  better isolation ...keep in mind record is not playing so acoustic feed back is out of question.
2.  Speakers are 43 inches from the needle when on record from each side.  tried moving to max distance room will allow to no avail. prob still occurred
3.  tried a different table with different cart.  got same issue.
4.  Upgraded stand ...isolation again.
5.  tried different tonearm cables, different inputs on pre...same prob.

Any ideas are welcome.  I love my system just cant play it loud....and sometimes I like it loud.
polkalover

Showing 3 responses by cleeds

Ag insider logo xs@2x
cleeds
2,065 posts
 
polkalover
.. when I rest the needle on the record (record not playing) and I turn the volume up to the 12 o’clock position, I get an incredible amount of woofer vibration from the logans. Same issue when playing a record.
I’ve tried:
1. better isolation ...keep in mind record is not playing so acoustic feed back is out of question.
The turntable doesn’t have to be spinning to generate acoustic feedback, which is what it sounds like you have here.

Ag insider logo xs@2x
cleeds
2,065 posts
 
tablejockey
ALL system's speakers will do the same with a table.
Not so. Feedback may be a common problem with turntables, but it is not inherent in all systems. My speakers are flat, in room, to below 20 hz. I have no feedback at any volume level, and my turntable sits remarkably close to one of the woofer columns. It's all about isolation and, imo, mass. 
Ag insider logo xs@2x
cleeds
2,065 posts
 
polkalover
... rumble still occurs at about the 2 o'clock position. Once again not playing a record just resting needle on record ...
If you hear noise without the platter spinning, then its source is something other than rumble, and is probably feedback.
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