DIY TT

@mijostyn

In the video, the turntable is on a floor stand. Mine is not. I do not have any vibration or rumble issues in my setup, Springs isolate in both directions, and while they may help in some situations, can also prevent passing higher frequency vibration from the platter/plinth back down to any platform or subchassis that a turntable might have.

If I recall correctly, which I may not have, you experience this as feedback some time ago and had to take other measures to mitigate it.

Dear @vinylzone  : " I do not have any vibration or rumble issues in my setup, "

How do you know, how can you be so sure?

I ask because time ago I was sure that my analog rig was free of any kind of generated distortions related as what we are discussing here with you.

A few months ago my friend Carlos came to my place and we were listening MUSIC, mainly classic because he is a Simphonic Orchestra player. Obviously that he is accustomed to listen at high SPL as in a live even seated at near field. So in one LP ( non classic score but Asian drums. ) with SPL over 95db and with a low bass reproduction part the windows started to vibrate... after that I told you Carlos if that vibrations affected the other frequency ranges ( mid/high ) sk if he detected " something " and like me he told me that does not detected any kind of " problem " about.

I took that experience as a confirmation that my analog rig was safe of that kind of " events " but I took a road to eliminate those window vibrations and in that road I find out that even that my friend and I can't detected any proble at high SPL with a high resolution full frequency response ( at least 16hz to 50kh) system in reality was not totally safe.

Total isolation of the TT/toneam/cartridge is not an easy target even if the analog rig is in other room. It's common sense and can bre preoved using sciene/measures and you are tell us that have a total/perfect isolation.

Something very good or bad in your system that I don't know its items, I think you have the small Maggies, Herron or something similar and what we look in that picture of your analog rig.

I have no questions for me, I know the answers. You need to make to question  your self about.

R.

@vinylzone To not detract too far from your entrance into this thread, I believe your  TT with the new adornment of the Maple Sub Plinth has improved on the role over the Plywood it has replaced.

I know this wood is selected for use in musical instruments for its damping properties, and more importantly how it impacts on the overall structure of the musical instrument when present and carefully attached, I would class this as a complex structure.

My structures produced are not complex and I have even produced a structure that can have a Sub Plinth in suspension on O Rings, a little like a SME Suspension Method.

I chose not to follow up on this method as it was precarious and not really trusted with valuable equipment sat upon it.

The Solid Tech 'Feet of Silence' have offered a variant of this type of a suspension support, and have been very satisfactory and remained as the most valued footer.

Their offered improvement over all other used footers, at being able to deliver a noticeable removal of smearing and offering increased perceptions of attack, dynamics, envelope and micro dynamics is quite something. 

Your structure and your use of Maple is not as complex as a musical instrument  structure, but I feel it can impact on the SQ in a manner that makes it a worthwhile choice.

Subjective evaluation from, in use/not in use periods, might give the additional reassurance for the choice made, but I would assume you have already experienced a this when the Plywood was swapped for the Maple. 

Having a few friends over is good thing, I would not deny anybody that experience, if it good for the mind, its definitely good for the body and spirit.

Would the average enthusiast for using LP's to replay a recording, find it  necessary to use such an experience to suggest that a few subjective evaluations, where a friend or two likes the experience and musical encounter with their preferred music being replayed, is an evidence that you are an authority and guru on a set up for a LP replay.      

Would the average enthusiast for using LP's to replay a recording, find it  necessary to use such an experience to suggest that a few subjective evaluations, where a friend or two likes the experience and musical encounter with their preferred music being replayed, is an evidence that you are an authority and guru on a set up for a LP replay.  

I am not sure he is claiming guru authority?
I thought it was more like a description or observation.

I would probably have stayed with the plywood if I thought it was vibrating, just because I “believe” it damps better.
But the maple should be stiffer, and in a system mounted on a solid wall, it makes sense too.

Anyhow… I appreciate @vinylzone  input and yours.

@vinylzone , I really do not want to be a Pita. I think you did a great job building your own table. My intension was to suggest improvements no get into a battle.

Any vibration coming from the cartridge should be dissipated in the tonearm. Nothing should be getting to the plinth. Unfortunately, you have a unipivot arm which is much poorer at dissipating energy than an arm with fixed bearings. You have loads of noise getting to your cartridge. You could place the table on a MinusK stand but that is expensive. You can isolate the table on your own for much less money, a fun thing to do. 

As for my turntable yes, I had a problem with feedback because of a resonance issue given the prodigious bass my system can produce and the location of the turntable. That resonance has been entirely mitigated with a simple modification. The turntable is now dead silent under any circumstance and nothing phases it including jumping up and down in front of it and charging into the cabinet it rests on. Given it's suspension, magnetic thrust bearing and isolated dust cover it is as quiet as a turntable can get. Speed deviation is no more than +- 2 thousandths of a revolution. At this very moment it is +- 1 thousandth going slowly back and forth between 33.334 and 33.335. As it is also a vacuum table most of the surface irregularities have been sucked out leaving only spindle hole eccentricity as a pitch modifier. With a concentric record pitch is delightfully stable. As good or better than any turntable made. Not bad for 15K. I also get a bunch of kudos for my finger joints. Life is good:-)