My office rig has progressed since I started working at my current location:
On-board Intel AC-97->PX100 (extremely noisy, lack-luster output of on-board sound made listening almost unbearable)
M-Audio Transit->PX100 (completely silent, great sound quality, drove PX100 sufficiently, but co-workers were annoyed by leakage of PX100)
Terratec DMX 6fire LT->PX100 (received new workstation that belongs to me, not the company – and they paid for it
, so installed easier-to-deal-with DMX 6fire LT, which sounds a bit better than the transit and doesn't clutter up my area like the external soundcard; colleagues still annoyed with the PX100)
Terratec DMX 6fire LT->HD25-1 (sounds much better than the PX100 and isolates well enough for co-workers tolerate while obscuring the din of the office so I can work more productively; still the HD25-1 wasn't well-controlled by the line-out of the 6fire...)
Terratec DMX 6fire LT->Zu Pivot IC->PIMETA w/OPA627BP & 24V Elpac->HD25-1 (while the Terratec drove the HD25-1 to acceptable volume levels, it could not drive it with any real authority and therefore the bass was not controlled well and the details weren't as palpable – which I knew from listening to the HD25-1 with the Corda HA-2, which really commanded the HD25 – the PIMETA has solved any issues I had and I settled on the OPA to synergize with the HD25's forward portrayal; it also can accommodate 2 9Vs for portable usage).
Possible Upgrades:
I may upgrade the HD25’s cable (via Larry) when I find a suitable portable replacement that’ll supplant the HD25-1; it will then be relegated to full-time office duty and thus a heavier, 2-sided cable won’t be an issue (and the sonic improvements are NOT subtle – they’re even more apparent than the Oehlbach on the HD580 IME).