Sorry but "You are full of it and talking nonsense" sleepysurf.
To the other esl owners
The "slightest" wobble back or forward will effect the image/depth perception, that’s why we spike/blu-tac two ways to solid stands, so there is no back/forward, and do the same with floor standers. Also why Quad did it to their’s, even though they have a substantial frame and large spiked heavy platform
https://www.stereophile.com/images/717quad.bac.jpg As the micro detail can get smeared, if they ever so slightly move backward if the driver or esl-panel is trying to push back and forwards, instead of the driver/panel energy being projected into the room, it’s waisted moving the ever so slightly shaky panel instead.
I’ve done it with my ML Monoliths with a brace to the back wall so there’s no back/forward movement, and the image and depth perception was sharpened and increased dramatically, .
Cheers George