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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
georgehifi's avatar
georgehifi
4,966 posts
 
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 had the same thing with a Linn LP12, stylus on record (not spinning) volume up, tap the plinth and watch/listen to all hell break loose with feedback.
I was sure it was air born feedback after I tried everything even tried suspending the whole TT from fine wire from the roof bearers.
The only cure was I put the TT and all the electronics in the room next door and that cured the problem and NEVER SOUNDED SO GOOD especially the bass.
  
GOOD LUCK, after this I went to CD.

Cheers George   
polkalover OP
14 posts
 
@rodman99999 it varies by LP but I usually keep it at -3.  The IEC has no effect.

@georgehifi it won’t come to that but it is a frustrating annoyance. Thanks for tips
rodman99999
3,557 posts
 
That the IEC switch makes no difference, is really puzzling. Given that the woofers are(I'm assuming) pumping with it engaged, their excursions should increase markedly with it off.   Are we talking about an audible, "rumble", or subsonic excursions(trying to better understand your issue).
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