How about putting cork matting between the amp and the platform to absorb the vibrations ?
What is the floor type , wood on trusses with a basement , vinyl , carpet or cement slab ? What is the traffic situation on your street ?
A cement slab on a rocky grade beside a major busy street can receive vibrations from heavy vehicles on the street .
As can an old rickety wood structure .
Ever been near railroad tracks when a train goes by ? Ever had a record skip when you walk by the turntable ?
It all makes a difference on the way that you do things .
Instead of draining those vibrations away from the amp you could draw them to it !
Just as important as the material used for the base .
Good luck .
What is the floor type , wood on trusses with a basement , vinyl , carpet or cement slab ? What is the traffic situation on your street ?
A cement slab on a rocky grade beside a major busy street can receive vibrations from heavy vehicles on the street .
As can an old rickety wood structure .
Ever been near railroad tracks when a train goes by ? Ever had a record skip when you walk by the turntable ?
It all makes a difference on the way that you do things .
Instead of draining those vibrations away from the amp you could draw them to it !
Just as important as the material used for the base .
Good luck .