Springs under turntable


I picked up a set of springs for $35 on Amazon. I intended to use them under a preamp but one thing led to another and I tried them under the turntable. Now, this is no mean feat. It’s a Garrard 401 in a 60pound 50mm slate plinth. The spring device is interesting. It’s sold under the Nobsound brand and is made up of two 45mm wide solid billets of aluminum endcaps with recesses to fit up to seven small springs. It’s very well made. You can add or remove springs depending on the weight distribution. I had to do this with a level and it only took a few minutes. They look good. I did not fit them for floor isolation as I have concrete. I played a few tracks before fitting, and played the same tracks after fitting. Improvement in bass definition, speed, air, inner detail, more space around instruments, nicer timbre and color. Pleasant surprise for little money.
128x128noromance
@mijostyn
"When correct implementation of zero stiffness on loudspeakers is administered, there is no question of the superiority of this engineering practice on the voicing of the loudspeaker." (rixthetrick)

rixthetrick, What is zero stiffness? That is a term I have never heard before. How is superior when it comes to "voicing" a loudspeaker.

My father would have asked me if I'd bothered to look it up, before he'd answer such a complex question.

Zero stiffness:
http://www2.eng.cam.ac.uk/~sdg/preprint/OnZeroStiffness.pdf

As others have already mentioned, the effects of correctly implementing vibration isolation, is audibly heard. Correctly done, it's immediately recognized. And I don't need to prove it, you can do it for yourself, for really cheap. However, you need to know something about what you're doing.

For example the springs in your car/truck/motorcycle are rated specifically for that device. It smooths out the ride, it doesn't completely make it linear. Zero Stiffness is an ideal.

If you have electrostatic speakers (with their own limitations) or dipole speakers (with their own limitations) this is not likely (I would guess) to have nearly as much impact as an enclosure that is ported or sealed.

In most cases, I believe it's not the inertia of the small moving mass of the cone and voice coil that creates the most stored energy in a loudspeaker cabinet. I believe it is the sudden high and low pressure created by the drivers moving air within the cabinet (even a ported cabinet should see this pressure difference) that will deform the walls of the cabinet. It's not just pushing or pulling against the walls, it's doing both at a frequency that excites the cabinet.

Lewm mentioned transmission line woofers, I can see your logic,  and it makes sense. Have you tried isolation anyway?



This is a sign the springs were probably under not enough compression.
I think you could well be right.
When sitting on them they only compressed maybe 1/3 possible not even that.
Hopefully with the adjustment available on the Nobsound springs I can tune it to my liking.
If not I can try them under other items.
In most cases you are going to be better off fixing the speaker to the floor even if you are not on slab.
Okay, enjoy :-)


In most cases you are going to be better off fixing the speaker to the floor even if you are not on slab.
I am afraid that fixing the speaker to the vibrating floor, and letting external vibration in particular of each one of the speaker resonate near one another, will not do the job.... :)