Nobsound springs - load range

I am a total beginner here. I only use three under components and I pick where they go for stability and ignore the existing feet. I took the feet off all my subs and only use three nobs for them as well.

So far as springs go, since this essentially is a static application as I see it (I doubt I can see electronic vibrations…), as long as the spring is compressed down into the specified ‘travel range’ it doesn’t matter how much or how little compression (or squashing) of the spring happens. The rate remains the same.

But, the Nobsound supplied springs seem to have compression rate of about 20-25lbs/inch which seems far, far too high to me, with far too little travel. Somehow I think I want a ‘pillow’ spring where there is higher travel per pound. But is this erroneous?

QUESTION?    To achieve the best isolation for components or speakers does one seek a very high compression rate, assuming the weight will compress the spring down into the ‘travel range’ of the spring chosen. What is the ideal resonance (although I cannot measure it)?

And to get to that resonance, what makes more sense, lots of low rate springs or one high rate spring?  Both must be utilized in their respective ‘travel’ ranges of of course. I am about ready to buy a slew of 9.3lb springs to have more ‘bounce’ for push downward. Is this a logical thought?  I’d totally appreciate any thoughts from the more science minded out there.  Thanks.    Mark

The Rate I calculated for @hm9000 was right at 20lb/inch of travel for the spring measured.

Based on your specs, @ryder I calculate about 12.6lbs per one inch travel for the Rate of Compression.

As I understand it, so long as you are in the travel range (not fully compressed) then no matter how large the gap is, the force to move the object further remains the same or constant. I'd guess leave it in the middle but no one seems to have any idea why. Can the 'different audible results' be identified other than 'pre-knowing' how many springs are being used...  

I'd still love a thought on best Rate of spring to use. I ordered 100 springs .75" long with a 9.3lb/inch compression rate. These will allow a lot more travel of the component (or more soft 'floating'). 

Of course I do not know whether one wants one's equipment on a very stiff, barely springy bed, or on a highly springy and very flexible bed (assuming stability). This is the question I'd love someone to weigh in on with knowledge of resonances.

My point on 'constant force' should have been 'constant additional force' for movement of a constant size, additionally. 

With a constant rate spring the additional force (or weight) from (equidistant positions) position 3-4 should be the same as the additional required to move from 5-6, for example.

My wondering was that if the equipment (wt or force) sits in the operating range of linear motion of the linear spring will require a similar push, etc. to move it whether it sits up high or low (while remaining in range).

With a static application what changes (or not) from riding high in the range to riding low in the range. I guess those were the results from changing out numbers of springs. Interesting for sure. Thx.

@hm9001, I think we agree but that I did not state it clearly enough. If a single spring has a 4kg rate per 4cm, then from the resting point of a 1kg wt at 1cm, it would take another 1kg of weight to depress 1 more cm additional. It's what I have heard referred to as a 'constant rate' compression spring.

(Different is a 'progressive rate spring' where the rate changes, and increases as you depress. A common example was fork spring replacements in motorcycles for a nicer ride.)

Thanks very much for the above info on frequencies. It makes sense and I will work to further digest the resonant frequency issue. This sure gets me started. It will be interesting, after I do the math conversion to see where the 9.3 lb springs may get me or not.  Thanks again.

I disagree, this time-rare, with mc.  There's nothing wrong with looking for the best starting point via applied science, at least not IMHO. Others can try one hundred permutations and and individual audible testing if they so choose. The key is getting to the right place in the end.