Springs under turntable

The box has to hold the body of the speaker stable so that the energy generated by the amplifier to move the cone is converted only into motion of the cone. This is never perfectly achieved, of course.

The answer to your question is in the "this is never perfectly achieved"...

There is some critical value where resonance and distortions increase, and a treshold under which the distortions and resonance dont implicate an audible effects...

Putting springs under speakers isolate so much well from the other speakers influence and from feed back effect from the floor and from other external vibrations, then the audible effect is beneficial because the movement of the cone is maintained under a critical threshold...The isolation from external influence is less detrimental to the cone movements than some internal resonance from the speakers box without isolation coming from these external factors ,especially from the other twin speaker in the room...

It is not the case when speakers are not isolated properly.... It is the reason why springs are very useful.... Before i use springs i was using my sandwiches of different materials, that was good damping and complementary coupling and decoupling but not so powerful radical decoupling than springs.....The audible effect was way better than using nothing, but a smearing of the sound subsisted that was erased by the presence of the springs....

I’ve experimented with weights on top of speakers in the past, not on springs and found that it’s easy to overdamp the cabinet. Not always a good thing.

This why God gives me ears: to adjust the weight of the damping mass.... :)

And i use the same ears to adjust the compression of the springs by adding mass to the speakers... It takes me 3 tryings... First not enough: then harshness accent on high frequencies, after that too much weight and darker sound too much accent on the bass or mids bass....

The last one experiment were perfect playing with 2 mass of 5 pounds  ....The critical difference were around adding or substracting 5 pounds of weight on 100 pounds of total mass(speaker mass +concrete slabs)...

@mahgister,

What type of platform are your speaker on and how is it supported?

My springs are on top of this same platform now, where my speakers were before i add springs under them. I keep the"sandwiche" because all my gear are on the same desk....And 2 precautions works better than one.... :)

"Sandwiche" : 4 quartz feet+Granite plate +sorbothane duro 70+granite plate+cork plate+ bamboo plate....I called that a "sandwiche"....

Homemade, peanuts costs and good.... But the springs totally eliminate the residual smearing of the sound...This sandwiche was not completely isolating and the different materials were relatively to some frequencies coupling and not only relatively decoupling, then at the end the S.Q. was way better than nothing, but the addition of springs eliminate much of the unsuspected smearing of the sound at all frequencies....

The acoustic controls of my room do the main job at the end.... And these working of the controls of the room acoustic are way less known than the controls of vibrations and way more important for the final results.... But it is another subject for another thread.... Active acoustic controls and not only passive one....

Controlling vibrations, controlling the electrical noise floor, and controlling the acoustical dimension are what i call controlling the 3 necessary embeddings of any audio system.... :)

Embed everything rightfully before even thinking to upgrade one thing.... :)

You’ve got a lot going on there my friend. Way too much for me to try and analyse. As long as it works for you. Happy listening!

I totally agree on your "three embeddings".