Boy, Oh Boy! Towshend!

OMG Rick and F1 cars are only 200 mph, the speed of sound is 761 mph, krikey! you're right they should totally be tethered!

I am the biggest skeptic when it comes to tweaks.  I own the Podiums for my second story speakers on a suspended wood subfloor.  Tried spikes, no spikes stone with spikes and other isolation techniques.  The Townshend podiums worked the best for me.  I do think it's an essential component for this type of application.  Not sure what the impact would be on a solid concrete floor.  Just for another twist, I also enjoy the Synergistic Research HFT's in various combinations.  However, I have been a critic of their fuses since in my system they blow at the rated amps.  As always your experience may differ.

I had the same experience. Following @millercarbon’s advice a few weeks ago, I got some Townshend podiums under my Tannoy Kensingtons. Wow. The soundstage became very crisp, tight bass and much better clarity of the sound. Really good investment.  Thanks millercarbon!  Now I don’t believe any of the things they say about you🤣

I Took Audio Technica AT 616 to a friends who was contemplating the use of Townsend Plinths under his Floor Standing Speakers.

The affect on the presenttion was quite noticeable and as said the Bass had become tighter and the notes more defined.

My friend then went on to trial Townsend Sleds and now has a Plinth for the Speakers.

I have taken my ESL Speakers out of use and have been using Floor Standing Speakers for approx' 6 Months.

I have worked through permutations of Isolation, Starting with Spikes only and through to Two Teirs of Sub Plinth, trying out different materials for a Teir.
The AT 616 were introduced at teh stage of using a Sub Plinth and through the comparisons undertaken have proved their value and have a taken up a permanent place upun a Two Teir Sub Plinth assembly.

The last trial in my mind that can be done is a upward facing spike between speaker and AT 616. 
No rush for this one to be carried out.

The Top of the Speakers each have Metal Weights rested on them with 1/8" Cork Pads as Separaters.
The Weights were increased in increments upto 12lb (6Kg).
The initial addition of a  5lb Weight and the movement of it around the Top of the Speaker found a position that added a noticeable 'if small' improvement to the detailing.
Adding weight when the seating position for the weight was discovered, was perceived as underpining the improvement to the detail retrievel that was already noticed.
I have a personnal listening room so aesthetics are not too important,
weights added to the Top of Cabinet are in my view worthwhile as a invesigation.
Whether it is as ubiquiitous at producing the good impressions suspension footers can make will require further feedback from other Speaker Owners to confirm. 

Thanks all for the great feedback. It seems I’m better off trying some damped spike bottoms, was looking into these as they are nearby and fairly priced: https://www.bfly-audio.de/en/produkte/produkte-unterlegscheiben.html
Any thoughts? I was thinking to use the same under my turntable, it sits on 3 spikes as well, with small washer like metal rings underneath.