Nugent's FIM mod (Gotta try it!)This has to rate right up there with cutting out the analog filter in both ease of execution and benefit. Move one wire and it makes a huge difference. I certainly did not expect much of an increase in sound from this mod but I was wrong. Certainly more open and detailed yet retaining the sense of realism that the NOS guys are usually looking for.
Some guys may not experience quite as much benefit depending on their sources but with my Northstar transport it worked quite well. Certainly worth the minimal time and effort to try. Thanks Steve Nugent and Bill Allen for this one!
Bill's explanation of how to do it is buried in a paragraph on how to wire up the digital filter cap so to make it clear: de-solder the wire of your SPDIF ground from the DAC board and solder it to pin #2 on the pulse transformer (the bottom of the input side). There is a nice fat solder point to the left of that pin that is easier to solder to than the bottom of the SMD 75 ohm resistor. Done.