HRS Isolation damping plates

I have not tried damping plates, but I have a hunch that Glory is absolutely correct. I suspect that A bag full of led shot on top of a component may be as effective as any expensive solution. You can also try the effect of maple butcherblock on top of your equipment. . . e.g.:
http://www.cutleryandmore.com/prodlist.asp?BrandID=21&LineID=72
A DIY solution is to drive to your local kitchen counter fabricator. . . choose a small piece of discarded granite or limestone from the dump in the back of the store, and pay a few dollars to have it cut and trimmed to desired size. Then by a thin sorbitane pad to place on top of your equipment before you load it with the granit.
Let us know your results.

I have two of them. After I tried the small one on my Benchmark DAC1 USB, I got a medium one to try on my Luxman P-1 headphone amp and PS Audio P500 Power Plant, which I have found to consistently benefit from weights on its top. Somewhat surprisingly, I like the 2nd damping plate better on the P500 than the P-1. I'd describe the sound with the plates as quieter and blacker, without causing the sound to, as the material would suggest, plastic-ish, like the Vibrapods/Vibracone combo. I'll probably get a few more and eventually cover everything with them. One observation: I have been listening to much more violin recordings than I used to, probably because they are no longer irritating. The biggest difference seems to be less treble brightness and overall ... calmness.

I have received my dampening plate yesterday and was able to do a little testing last night. Straight off the cuff, I was not able to hear a significant difference. It certainly requires more A B testing.

Ghost,

You don't stand a ghost of a chance to hear any difference no matter how long you A/B.

Ghost, if the plates make a difference. . . try also some lowly material. . . Lead shot I already spoke about. . . but a 50Lbs bag of rice , pinto beans, or sand. . . may do the dampening trick as much on top of a component.