Springs under turntable

Mijo
I have been looking at the MinusK but a lot of $$$
The Nobsound are a cheap experiment and as I said if I still cannot make them work to my taste under the 401 I have plenty of other pieces of gear to experiment with...lol
It will not be $65 wasted for sure.

Noromance 401 is pretty similar ( heavier as he has an aftermarket heavy platter, mine is a standard platter modded for extra weight) and I am sure comparing notes I can get close to what he has achieved so far

In addition to stiffness, I believe the issue may also include a component of compression/travel, which is related to the number of winds.

Correct Mitch.
When I bought mine I spent some time going through various spring calculators including coils per inch and wire thickness and wire material (which ALL affect compression ratio!), who knew there was so much involved in the humble spring!

« Almost all physics can be reduced to springs behavior and the residual part was never understood anyway» -Groucho Marx

Certain engineering evaluations can be solved (approximated) by modeling the behavior as a series of springs and dashpots.

For those of you supporting heavy speakers on springs, do you recommend stiffer or more moderate spring support? In other words, how does the supported combined speaker/stand weight compare to the total available spring loading capacity....something moderate like 50% or something less (i.e., stiffer springs)?

From experience, I would suggest somewhere in the 50% deflection of each spring would be a reasonably safe bet, I know that the tendency is to keep the tweeter (at least) on axis at listening position.

The term I use zero stiffness, stiffness or rigidity here couples the speaker to the support, by removing the stiffness (zeroing it) the speaker cabinet should find it's mechanical equilibrium (where it rests when not energised) and if you can gently move a big heavy speaker with just your pinky finger, you have a pretty good starting point for vibration control.

The spring rate is weight dependent. Weight / number of springs @ 50% compression.
Spring rate is critical, turns is also important, so far I have liked the most, are 3 to 3.5 turns + ground ends on each end of the spring.
I deliberately purchase with the diameter at least equal to or greater than the final load height.
I found that I like a taller spring, my guess is that small amplitude high frequencies are well sorted with more material to deflect them??

Any experts here?

I am not an expert, that was my employer, however I learnt all that I could from him before moving to USA. PM me again, we can go through it together and I'll see if I can get you similar results to MC.