Best isolation under a big receiver ?

I have found the gingko cloud to be great under my cd player, and am perfectly satisfied with it. But i have nothing under my big b&k avr307 receiver except the shelf it sits on. I know it is not as sensitive as my source, but i would still welcome your thoughts.
im using a pioneer 1250 and getting good results with a large bamboo butcher block....get those speaker cables off the ground too
I found Herbie's Tenderfeet made a nice difference under my tube integrated. If your receiver is over about 45 pounds you'll need something more heavy-duty though.
Receiver weighs 60 lbs, and my cables are already off the floor. I am a little leery of hardwood slabs due to reports of dynamics being killed.