Townshend Springs under Speakers

Also both the Kento and new 7 extreme use a force cancellation alignment of the unique to Vandersteen Scanspeak bass drivers, reducing already low cabinet movement. 

Fun

Since 1977

if the speaker is on solid ground, 3 spikes is preferred.

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That's the problem there is no such thing, the actual floor becomes a transmission medium and delivers a signal out of time with the actual driver's delivered signal via AIR.. The floor no matter the medium (unless it was 1/2 thick rubber) will deliver a signal at two different times to YOU in the seated position. SPIKES cause it, decoupling stops it.

12" thick concrete is not thick enough, maybe on 4 foot center 12" x 60" friction piers. A 12" thick slab and a 1/2" of rubber.. Drop the speaker on that..

For the best results ALLWAYS decouple, mains and subs, one from the other, and the room surfaces and boundaries.. There is no exception.

Spring, pods, innertubes. There is more than one way to skin a cat..

Regards

i thought the best results were whatever sounds best to you in your listening room. 

Seems to me, when it comes to Vandersteen loudspeakers, the best advice comes from Richard Vandersteen. He's a very thorough designer.

If a Vandersteen owner reports results using Townshend podiums, then that will offer some further insight.

Until then, I'd go with RV.