Are you using material recorded by yourself using DHTs? If not, every commercial recording or radio etc broadcast won't have been anywhere near one, so I'm not quite clear how they can improve on them? >>
Very good question. Hazarding a guess: a) If the recordings are done fully in the digital domain, then the analogue stage of home reproduction should make a significant difference b) even if the recordings are done with analogue stages, then the home reproduction amplifier (whose job it is to add significant amplification to the signal) is still one stage in the final sound, and can be better or worse.
The thing about DHTs is that they don't appear to 'add' anything like warmth, euphonics and the usual things said about 50s and 60s tube amps
- that's not their characteristic sound at all (no fuzzy ECC83 warmth or rounded EL34 tone). The two things they generically seem to have is clarity and faithful timbre of instruments. This doesn't seem to be 'added' - how can you add clarity and faithfulness of timbre?