2. tech-talk
  3. 143850-78103

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
polkalover OP
115 posts
 
@rodman99999 
So based on this chart there's a compatibility issue which raises this question...see link https://positive-feedback.com/reviews/hardware-reviews/eat-c-sharp-turntable/

He had my TT set up and had great results.  I'm not thoroughly convinced that is the issue, but makes a case for the problem.
rodman99999
6,139 posts
 
That reviewer may have had a subsonic filter(many phono stages do), speakers without very low extension, a room with differing Sabine coefficients, etc. They don’t mention anything, regarding their reference system. It would be simple, to experiment with your tonearm mass/cartridge weight, to see if anything changes. Also, very advantageous to determine at what freq your system(both great pieces, btw) is resonating.
rodman99999
6,139 posts
 
Just curious: At what level do you have the Bass Control set, on your Logans and- does your phono stage's IEC button, make any difference when engaged?
georgehifi's avatar
georgehifi
10,312 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
115 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
More to discover