In the mod process I've always aimed for increased resolution and transparency(clarity) for RBCD. I've found that what is described as "ruthless" or "analytic" clarity is invariably some deficiency in the engineering of the CDP that when resolved, obtains both higher resolution AND increased sense of warmth, liquidity, smoothness, refinement, relaxation, and realism. The effect is to make both well-recorded and less well-recorded RBCD more realistic & listenable-- not to exaggerate the "flaws" of RBCD. In fact, things have evolved to the point that treble of RBCD is more resolving and sweeter than vinyl in my system.
Mrtennis, we are not too far apart geographically. If you ever feel the urge to test your paradigm about coloration, feel free to bring either Marantz player by for a comparison. I have both modded and stock versions of SCD-1/777ES on hand, and it's easy to compare them to each other and to Marantz and also to swap from active to passive analog sections on the fly in the modded unit, in order to demonstrate how much is lost when you soften the treble and bass by switching out active SS buffers to reveal the "purer" signal path of passive transformer outputs. A demonstration such as this decisively shows the importance of PRAT in making RBCD convincing. I made a direct comparision awhile back to an SA-1, and determined that what was most missing with that Marantz was a sense of dynamic sweep and macrodynamic scale. It's a listenable but merely polite player. I have not heard the SA7S1.