This for me is a very interesting topic. I have tried over 20 different types of anti-vibration products.
First I would like to say we are the importers for North America Welllfloat products. The best antivibration products we have experienced are built by a company called Wellfloat. This company is based in Japan and I would highly recommend their Delta Extreme footers on speakers and subwoofers.
https://wellfloat-global.com/delta/
Robert Neill
President
Worldwide Wholesales
519-619-9924