There are no exact measurements in placing cones or bearings under a component. Many manufactures do suggest an initial placement, and the rest is up to your listening skills. I have found that a slight movement in placement of a cone can change the soundstage and imaging.
Isolation Cones/Bearings placement on CD Transport
I would like to know what is the best configuration for placing isolation bearings underneath a CD transport? Should I place 2 devices towards the front of the component and 1 in the back or 1 device in the front and 2 in the back? Are there any audible sonic differences either way? I am going to use a set of Final Lab's DARUMA 3-II isolation bearings on my EAD T-1000 transport. Thanks for the help.