I'm not sure on the kind of advice you are after. I haven't played with that driver and never listened to a dt770. Digikey got the photo wrong but that's OK. The driver is suitable for both open (like the DT770) and closed design. The DT770 being open you probably don't need to do much, if anything to get the most of the drivers. The closed designs do need some tuning like the cup volume, holes at the back of the cup and/or in the baffle, things like these. One thing you can try, only if you feel strongly that there's too much sound imbalance (bass relative to treble) is to open/close the holes on the back paper around the magnet. More holes = more bass, although, again, in an open design the effect seems to be less pronounced than in a closed design. Even a pen is good enough to pierce the paper. Be careful not to pierce too far as to pierce the membrane. If you need to, cover the holes with some sticky tape or something. They'll most likely sound different - how different and how you'll feel about that, you'll see, but they should be good quality. They are being used by some companies in their many hundreds $ worth of headphones.
