PM, the Adcom was designed by Nelson Pass. If you read reviews of his earlier preamp designs or are familiar with them, they are all noted for being "ultra accurate" i.e. "clinical" sounding. They might be a good choice to mate with his very smooth yet detailed sounding amps, but not for something that is already on the "etched" side of neutral. As to specifics, i've been told that the GFP sounds much better in the passive mode as compared to the active mode. Sean
>
>