Thoughts on Turntables and Vibration

puroagave said:
Per your advice and that of others, I broke down and acquired a BM-8 for my Simon Yorke S10. I really had no choice since the Yorke is suspension-less and high mass. Im renting a house for now and the system resides on the 2nd level, footfalls were making vinyl replay well nigh impossible. I have a second SYD table on a wall shelf and its fairly immune from feedback and an interesting contrast, comparing two near-identical 'tables with different isolation solutions. I'll save you from speculating, the Minus-K was worth every cent and I got the nickel tour of the factory to boot.
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Rob-When you say your SY table is “high mass,” how much weight are we talking about?
 
puroagave said:
78 lbs with plinth
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Thanks. My stereo room is upstairs in my house and I have had 3 tables on my SRA rack and never had issues with any of them. None of the tables have a suspension and they all have a different mass with my SX-8000 being the heaviest.
 
mep said:
Thanks. My stereo room is upstairs in my house and I have had 3 tables on my SRA rack and never had issues with any of them. None of the tables have a suspension and they all have a different mass with my SX-8000 being the heaviest.
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this is a 45 yr old tract house built with matchsticks and 50% of it is eaten away by termites. I had to store the records on the ground floor for fear of the 2nd floor coming down :S
 
puroagave said:
this is a 45 yr old tract house built with matchsticks and 50% of it is eaten away by termites. I had to store the records on the ground floor for fear of the 2nd floor coming down :S
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Holy crap! Get out before the house caved in on you!
 
Dre_J said:
Hi Nico,

I'm trying to follow the progression of this thread after becoming aware of its existence from a friend. Are you interested in possible solutions or are you just wanting someone to report back on their findings listening at 100-105dB (peaks?) or both?

If you are looking for possible solutions, can you provide a bit more information? Here are a few practical question I'd ask:

- For a practical application test scenario, can you list a couple of rock LPs (hopefully something I have in my archive) and track titles where you have experienced this issue so I can attempt to duplicate?

- Can you explain the type vibrations you are talking about (This would be something like: a type of feedback that overloads the system and creates severe distortion or something else explained in a similar manor.)

- Can you share the condition (or scenario) of one or more of your LPs where, within the music's performance, this occurs. (for example: 2:34 into LP xx track title xx, the vibrational feedback occurs, etc.)

- If you listen to the same music at the same level setting on your preamp and you turn your subwoofers off, do you still get the same condition? (I'm not suggesting you stop using your sub. It's just a test case that could help provide additional information to help with identifying the effect under a different condition.)

- Are you on a concrete or suspended floor?

- What type of support (equipment rack, platforms, feet, etc.) do you have for your turntable?

- Does your phonostage contain vacuum tubes?

If you'd like to, or prefer to, discuss this offline, we can arrange that. We have a mutual friend that once lived in R. Va. when we first met many years ago. If your contact info hasn't changed, it is available to me. If it has changed, you can contact AC and ask him to send you my contact info.

Dre
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Hi Andre!
Long time no see!! Nice to hear from you! I will call you tomorrow!
Thanks!!
 
By my reckoning, 'Dre has forgotten more about TT set-up than most of us can recall. Which is to say, when Dre speaks, you listen (he's also a gentleman to the T). I don't have that kind of patience, I'm not quite as fastidious as MEP but im also onto BS pretty quick...
 
A big thank you to Dre_J for helping me finding a solution to the issue. The source of the problem was rumble coming from the TT. The low frequency noise produced by the TT was retro-fed to the TT and was being amplified when playing at very high-volume levels.

As Dre_J pointed out, this is an issue that is fairly common in set ups installed in rooms with wooden joists. Under normal volume conditions, this is typically not an issue. However, at very high volumes, the vibration can move through the floor joists and up the rack and into the turntable creating feedback.

After experimenting with different scenarios such as subs on/off, relocation of vibration dampers, loosening and/or tightening nuts holding the wood plank where the TT sits on, the issue was finally solved. As Dre_J put it, it came down to a combination of energy damping, absorption, and redistribution of the vibration away from the TT platform. Mind you, the rumble generated by the TT is inherent to the turntable and cannot go away. However, the vibration that it generates was managed in a way that it is now not an issue even at high-volume levels.

Big kudos to Dre_J!! Thank you!!
 
nicoff said:
A big thank you to Dre_J for helping me finding a solution to the issue. The source of the problem was rumble coming from the TT. The low frequency noise produced by the TT was retro-fed to the TT and was being amplified when playing at very high-volume levels.

As Dre_J pointed out, this is an issue that is fairly common in set ups installed in rooms with wooden joists. Under normal volume conditions, this is typically not an issue. However, at very high volumes, the vibration can move through the floor joists and up the rack and into the turntable creating feedback.

After experimenting with different scenarios such as subs on/off, relocation of vibration dampers, loosening and/or tightening nuts holding the wood plank where the TT sits on, the issue was finally solved. As Dre_J put it, it came down to a combination of energy damping, absorption, and redistribution of the vibration away from the TT platform. Mind you, the rumble generated by the TT is inherent to the turntable and cannot go away. However, the vibration that it generates was managed in a way that it is now not an issue even at high-volume levels.

Big kudos to Dre_J!! Thank you!!
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Hi Nico, I'm happy we worked it out and found a solution for your specific situation. Now, you can enjoy all of your source components whenever you want to and without worry.

Best regards,
Dre
 
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