I am familiar with experiencing in use Townshend Sleds and Purpose Produced Weight Matched Plinths, there is no doubt there is a perceived improvement when these ancillaries are supporting certain Cabinet Design Speakers.
It was my introducing a individual to AT 616 Pneumatic Footers and the noticeable changes to the sonic, that encouraged the individual to investigate further suspended footers and in the end have the Townsend Weight Matched Plinths produced. I myself can't agree that there is a Substantial difference to be found in the final produced sonic, between differing footers that offer a Suspension to a Cabinet Design Speaker.
At another time I loaned the AT 616 to my Local HiFi Group, they were used on a few different Speakers, Cabinet and ESL as well as under Valve Amps and TT's.
From the Group in attendance one followed by purchasing Gaia III Footers.
These have grown in the impressions being made and now most of the Group have Gaia III's in use under Speakers and in some cases Valve Amplification and a TT as well.
Again these are systems I listen to on a regular occasion and the ones that had the AT 616 in use don't seem to have produced much more than what the 616 could produce.
I am not suggesting the AT 616 is the most desirable product, I am merely pointing out that the addition of a Suspension Type Footer can have a noticeable improvement to the perceived sonic. How much one has to spend as an increased outlay to improve on a initial experience is an unknown to myself.
One other consideration that is worthy of investigation is not just the Footers but the Sub-plinth arrangement under Cabinet Speakers.
My experiences have shown that any Floor Standing or Stand Mounted Cabinet Speaker, can have the perceived sonic substantially improved, when mounted on a Two Tier Sub-Plinth with decoupling between the Floor and Lower Plinth, between Plinths and Upper Plinth and Speaker.
After trying out many materials and thicknesses of these materials, the Sub-plinths I have found to offer a lot and at not too much expense is a combination of 50mm (2")Granite and a 40mm (1 1/2") Dense Chipboard (Kitchen Worktop)
Spike Decoupling works fine, swapping out the Spikes for suspension footers under the Cabinet will create extra attraction.
