Whirring sound?

[Kunter]

This may be the reason why some aftermarket feet under the D's help the sound a lot... That noise should be created by some vibration.

I currently use Stabilian Quattro to a great effect. (they do not have a website yet)

Photo attached. 3 under each D800, total 6.

There are ceramic balls between each plate, and the plates are Aircraft Grade Aluminum... They somehow allow the amp to "float" a bit. I am very happy with their addition despite the Pagode Master Reference rack they are already sitting on...

Cheers.

Kunter