I have had several customers tell me that our image clarifiers are a "must have" for the NuForce REF9 monoblocks. They say that there is some HF grunge that dissappears when using the Image Clarifiers.
Located on the webpage under tweaks.
BTW - I was very impressed by the Ref9 monoblocks. Not that they will not benefit from mods, but they sound surprisingly close to my reference modded JC-1 monoblocks even stock.
Steve N.