my sub walks!

[benny z]

folks - i've got a rather large and heavy sub that WALKS on my hardwood floor. surprises me, since it is so heavy to move manually. every time i watch the "echo game" scene in house of flying daggers, my sub moves several inches and ends up bumping into my main right speaker!

any input on what i can do to put an end to this? i am not interested in raising the sub up off the floor on a riser for asthetic reasons ala swmbo.

any recommendations for some type of rubber/other compound to attach to the sub's feet to keep it in place?

thanks!
- ben