Springs under turntable

I've always been a cones and rigidity man.

Me too! Everything on BDR. Everything! https://systems.audiogon.com/systems/8367
Even so I always was aware of the drawbacks, just never thought this could possibly be the solution. Did not help AT ALL that the least credible biggest joker in all of audio was pushing springs. Oh well. Under the bridge. 

Put springs under the subs last night. Not all the subs just the 3 closest to the turntable. Replaced BDR Cones with springs. At first was like, well this is underwhelming. Bass was maybe a bit better, but also maybe a bit less. Probably because eliminating bass being transmitted through the floor leaves only bass in the air. So it feels different. Which makes sense. But then, wait a minute, what the.... midrange presence, top end extension, holy crap the springs under the subs just massively cleaned up everything else and the detail is so much more natural and amazing! Al Stewart isn't just singing he is RIGHT THERE in freaking person!  

My cones and rigidity thinking had me convinced that my 750 lb rack of solid concrete, granite and sand was impervious to acoustic and even mechanical energy. Evidently not! Not even close! The subs are putting out the same acoustic energy. More. I turned em up!

The only logical explanation is mechanical vibrations from the subs had been transmitted through the floor to the rack and right through its 750lbs all the way to the turntable. Crazy!

Why this works has to be what Max Townshend says in his video. Look at a record, the light pattern tells you there's sub-micron scale squiggles. These unbelievably small details are where the sense of 3D placement and room size acoustics are. They're easily blurred over by even the slightest vibration. That's what I'm hearing. That's what noromance is hearing:

• Lots more detail - I can hear more of the acoustic, inner detail, deeper stage.
• Tiny details more obvious - like listening to records all over again
• Speakers are totally GONE

My Nobsound springs are coming Friday. It sounds so good already, can hardly wait to hear with springs under the table.

This is insane. Sound is getting better as they bed in OR as I acclimate to the new presentation. It's the delicacy thats amazing. Like going from an okay MM to a superb MC. It's also showing me that I was wrong about the limits of the Garrard/Decca as being a touch shy and rough and ready in the upper range. Nope. This is see-through detail. Best part is that the music isn't sharp and seering - it's warm and beautiful and very detailed.

@millercarbon Can't wait to hear what you think. 
Percussion is spectacular. Julie London on mono from 1966 can't be mono!!
One small downside. Poor recordings are laid out in their inadequacies. 

"What is going on?"

You’re decoupling from floor bourne, mechanical, and acoustical vibrations.

Hello,I have been experimenting with springs for sometime and I have the Nobsound springs/disks as well. What is important here, in my opinion, is to get the correct set of springs that for a given load bring the resonant frequency of the platform with the load to below 5 hz. Without that you are likely not going to get much benefit although they might sound better than any tightly coupled solution.
Also you have to pay attention to asymmetrical load distribution of the component which would require different set of springs under the platform. I prefer putting the springs underneath the platform instead of directly coupling to the component because that allows you to design isolation in the horizontal/rotational directions on the platform like roller bearings.
The good news is that none of these challenges are insurmountable if you have time to experiment. In the end I agree with you all that isolating your audio/video components and addressing the seismic vibration challenge is the way to go...Thanks.