Thanks, atmasphere. The two signal paths are completely different. The recording chain is: Turntable (Thorens TD-166 MkII, with either Ortofon OM-30 or Denon TD-160 cartridges) > McIntosh C220 preamp w/MM phono section > Kenwood graphic/parametric EQ > Marantz CDR-630 CD recorder, which does the A/D conversion. The Grados are connected to the headphone jack on the Marantz.
The listening chain, ultimately, is FLAC files on a Vortexbox Appliance > Wifi router (via ethernet) > Squeezebox Touch > Superberry DAC (highly modified Beresford DAC) > McIntosh C220 preamp > Odyssey Audio HT3 amplifier > Ohm Walsh 2000 speakers, each with its own Vandersteen 2Wq subwoofers with HP-M5 battery-biased crossovers.
However, based on listening to my digitized LPs on my own system and other systems known to be pretty neutral, my recordings definitely sound brighter and more bass-shy than they did when I was doing the recording. Hence the post. Unfortunately, the high-end Grados and Sennheisers are beyond my budget.