FWIW, my suspicion is that the conflicting assessments of the Tascam recorder by Jeff (JWM) and Dhl93449 are both correct. And one look at the system description thread for Jeff's extraordinarily high quality system will make it abundantly clear that his much better assessment of the Tascam is not attributable to any lack of musical resolution in his system.
So what could account for the differences in the two assessments? A possibility that occurs to me is that the ultra-wide bandwidth of Dhl's Spectral DMC-10 preamp resulted in spurious RF energy being introduced into the Tascam, which its
anti-aliasing filter could not adequately reject. Perhaps because that energy simply bypassed the filter, coupling "around it" and into the A/D circuitry via stray capacitances, less than ideal circuit grounds, or other extraneous paths.
Conceivably that spurious RF energy might have been picked up out of the air, from electrical or electronic devices within Dhl's home or even from radio stations. Keep in mind that there have been more than a few threads here in which people have reported actually hearing radio stations through their systems while listening to vinyl sources, while using components having vastly narrower bandwidths than the Spectral.
The bottom line: If my theory is correct, while the poor results Dhl obtained with the Tascam reflect less than optimal design, the Tascam would provide significantly better results in most systems than it did in his application.
Regards,
-- Al