New plinth project for Lenco L 75

[kuruvilajacob]

it is a conundrum, as you say. Every part of the hifi system picks up vibrations from room sound, and are affected in some way. Acrylic, although nice to look at and easy to machine, is not a very good material from a vibration point of view, as it has low intrinsic damping.

But it is used because it looks fine, and machines well, much like mdf, another poor performer. Seems like acrylic (and mdf) are used by people who are concerned more with looks than sound.

It just happens to be the most easily available stuff for this kind of work. I think people use it more out of convenience than any thing else.

 

[peace_sells]

it is a conundrum, as you say. Every part of the hifi system picks up vibrations from room sound, and are affected in some way. Acrylic, although nice to look at and easy to machine, is not a very good material from a vibration point of view, as it has low intrinsic damping.

But it is used because it looks fine, and machines well, much like mdf, another poor performer. Seems like acrylic (and mdf) are used by people who are concerned more with looks than sound.

Does this mean that those acrylic transrotor TTs are more susceptible to vibrations that would affect playback?

 

[reubensm]

Does this mean that those acrylic transrotor TTs are more susceptible to vibrations that would affect playback?

I would believe that thicker acrylic is less receptive

 

[arj]

I would believe that thicker acrylic is less receptive

it might also have to do with the surface of the acrylic ie polished (reflect) vs Rough (dissipate).
This is good info !

 

[Tanoj]

Hi Friends,

@Jacob Sir : You are Master of Perfection... Looking at the Build itself i can imagine how superb it would sound, you have magic in your hands, the work does not need my appreciation :clapping:

@ Reg the Dust cover : its so neat and built like tank ... Things like this TT and Cover are meant to be acquired as life time achievement.

My Opinion on fixing the dust cover : i usually remove the cover when i play my fav records etc and sometimes close the cover ( as it reduces the problem of feedback ) when iam casually listening

i always wanted to give the cover a thin bidding made of either dark Sponge or Nylon, it will help in three ways

a) it will stop the dust entering inside part ( Platter etc )
b) it will give nice damping when the Cover is closed , thus helps reducing vibrations
c) it will prevent the marks formed my cover on the plinth
Best Regards

Tanoj

 

[jls001]

Does this mean that those acrylic transrotor TTs are more susceptible to vibrations that would affect playback?

I think these are two different things. What is being cautioned here is against mounting a box type cover on a hinge, and playing the turntable with the cover opened/stood up on its hinged support. Besides the airborne vibrations that the large surface area of the cover may receive (especially when stood up on its hinges) possibly leading to unwanted vibrations to the turntable, I think the weight of the cover on one side of the turntable can also cause imbalance in weight distribution and make the turntable more susceptible to vibrations. That the box is made of acrylic is probably secondary. The two scenarios mentioned here will apply equally well if the cover is of some other material.

On the other hand, Transrotor tunrtables use acrylic as part of its plinth, and that's not the same thing as having an acrylic cover supported on a hinge from the plinth.

 

[jls001]

My Opinion on fixing the dust cover : i usually remove the cover when i play my fav records etc and sometimes close the cover ( as it reduces the problem of feedback ) when iam casually listening

I too think that's the best way to do it - simply remove the cover when playing it. Put it back when you are done with your listening session.

i always wanted to give the cover a thin bidding made of either dark Sponge or Nylon, it will help in three ways

a) it will stop the dust entering inside part ( Platter etc )
b) it will give nice damping when the Cover is closed , thus helps reducing vibrations
c) it will prevent the marks formed my cover on the plinth

That's an excellent suggestion!

You can also glue felt to the bottom edge of the acrylic cover.

 

[cat's squirrel]

Does this mean that those acrylic transrotor TTs are more susceptible to vibrations that would affect playback?

acrylic in general (including Corian) is not the most inhert of materials (my way of saying its pants/chuddies). What has to be factored in is the physical design, that is, where it is supported, has it free edges or is it clamped in any way. This can affect the way it vibrates, but vibrate it will.

What is needed is suitable material available anywhere around the world, at the moment I have only managed to source natural material from Africa, Australia and South America as
being suitable for audio work. But I haven't tested wood from India yet, apart from rosewood.