There are now new HRS DPX Series Damping Plates - with more than twice the mass of the DPII.  The largest plates come in at a whopping 5.5 lbs. These were added to the product line because people were often found to be using multiple plates on a single component.

Careful though, one CAN over-dampen a component with these plates.  The regular DPII is still the regular model for damping, and these DPX will achieve sonic difference when single DPII can not do.  

If you want your system to sound a lot better without even having to upgrade any components - this is it. We have found HRS to be a consistent and a predictable performer.