I had a noisy Humax PVR, I stood it on some pieces of foam packing I got from B&W when I needed to replace a tweeter which had become damaged from a digit of a small child
The new tweeter works fine and the packing it came in is now under the Humax and it sorted out the vibration problem, 2 jobs sorted in one.
BTW many thanks to B&W, I ordered the High frequency unit over the phone and it arrived the next day, excellent service.