I now have several hours on the DT770 Pro-80. Not yet fully broken in, but good enough for a quick review.
Directly compared:
Sony MDR-7509HD (my last headphones)
Sure SRH840
Sennheiser HD380 Pro
Beyerdynamic DT770 Pro-80
Tonal accuracy is very good. I am using as a reference my home theater with Sunfire XT ribbon hybrids and Bag End professional mastering subwoofers. The all important mid-high region is spot on. Bass is a little emphasized, true, but the degree is exaggerated IMO. Cutting by ~ 2dB at 80Hz brings it into line.
Transients are very good, bordering on excellent.
Imaging is very good. Definitely bettered by semi-open and open headphones, but they have their own drawbacks.
Comfort is very good - as mentioned one can adjust the spring tension to one's preference - very nice feature.
Isolation is Good to Very Good - a bit above mid-pack. I haven't seen a variation in this aspect amongst closed backs, excluding super high isolation special purpose cans.
Main drawback is load/efficiency. In my experience these can not be adequately be driven by either a laptop sound card or by an MP3 player, even the powerhouse Cowon D2. I have a Turtle Beach USB DAC/amp at work, and a Total Airhead for travel. So far have only used the Turtle Beach but I have little doubt that the Airhead will have enough oomph.
So far have been using the high bit rate Pandora stream as a source, looking forward to mobile use when I'll be using primarily FLAC and higher bit-rate MP3.
Edited by sbradley02 - 8/24/10 at 2:25pm