I think I know what you are referring to... The RE-1's digital board responds very favorably to polypropylene caps around DIR9001, 75Ω matched Caddock resistors and line driver chip changes... Tightening the input SPDIF signal tolerances with Audiophilleo and likes must have similar effect.
I can confirm some of this (the DSP-1 mod made for a tangible increase in overall SQ as did the MAX mod in general)....my matched set of 75R Caddocks are on the way from PCX......replacing the Solen MKP's (0.1uf 630V for K42 PIO .1uf 160V with T-1 820pf 200V Teflon bypass) should improve things even further (underneath the DSP-1 board directly). I recently replaced the Solens in the Phoenix PSU with K42/K40 PIO combination to great effect which then prodded me into getting rid of the MKP's in the RE1. Some of the glare and grain can be attributed solely to the Solen MKPs and to a much lesser degree the stock NoVer electrolytic caps. The stock NoVers are excellent baseline reasonable cost parts but they can be bettered (without costing a lot more ). The NoVers IMO impart a whitish quality to the upper mid/treble regions while they also are not quite as accurate in the bass region (in terms of tonality, texture and weight) as the excellent Mundorf M'lytic caps are ....I realize such statements will have a lot of eyes rolling around here (and likely elsewhere) but the proof is in the pudding. These DACs (and amps for that matter) have a lot of potential to tap if one is so inclined to take a chance. I also realize the MAX mods are likely way too involved for most DIY/part time tinkerers to undertake....it is a fairly major risk to follow suit (unless you are sure of your skill level).
To Project86....I love reading your reviews....they are well thought out, thorough and filled with very useful easy to understand information that is devoid of the usual audio speak that can be trying to comprehend from a practical standpoint. Your reviews convey straight forward info that anyone can find meaning in...that's not an easy task...thanks for the effort and your impressions. A job very well done.
Edited by Pricklely Peete - 4/29/11 at 2:43pm