I'm using SDS Isoplat Mat with cork backing.
The biggest sonic improvement though, has been realized
after replacing stock feet with Starsound Technologies
Audiopoints. I can't emphasize strongly enough a degree of improvement, especially in the bass definition.
It all will depend on the flooring and the rack construction, but in my case (concrete floor and Mapleshade
Samson DIY clone)direct coupling is the way to go.
The biggest sonic improvement though, has been realized
after replacing stock feet with Starsound Technologies
Audiopoints. I can't emphasize strongly enough a degree of improvement, especially in the bass definition.
It all will depend on the flooring and the rack construction, but in my case (concrete floor and Mapleshade
Samson DIY clone)direct coupling is the way to go.