Auralex SubDude HD - Subwoofer Isolation Platform

Yes. Works great and also protects floors and the sub. Inexpensive as far as tweaks go.

works great

Great platforms. They have really helped my system.

I use their large platform and it is great.

Mine works fine to decouple and eliminate spurious vibrations from being conducted through sprung flooring. However I am curious to try a more sophisticated coupling approach such as Sistrum platform. This should theoretically provide a drain for vibration that is otherwise broadcast from the walls of the speaker cabinet, possibly improving focus.