The DT 770 are very good, closed-back, neutral listening headphones. They deliver a well balanced audio reproduction with a near perfect mid-range and a great bass that doesn't drown instruments and vocals. They don't have the spacious Soundstage of the DT 990 PRO or the DT 880, but they have a better bass thanks to the closed design. However, the bass range was a little inconsistent in our measurements and depended somewhat on the shape of the listener's head. They also tend to sound a little sharp with some tracks due to the emphasized Treble range.
Durable, lightweight, sits comfortably on the head and most of the parts are replaceable. Top end gets rather harsh and fatigue can set in quickly.
This is the headset to get if you need something to withstand bandmates or a small studio. Their time-tested sound and durability earn top marks for computer users and people who need something for tracking. If you want something to listen to on the subway, you're going to want to keep looking.
Despite being "old", the Beyerdynamic DT 770 Pro is still worth a consideration today, that is, if you want an over-ear more for home use. It designed with portability in mind. But for what it gives up there, it has very good comfort, isolation, and sound quality for its affordable price tag, even up against modern alternatives.
The Beyerdynamic DT 770 Studio offers excellent sound quality and a comfortable fit, which helps elevate it from other pro-level headphones.
This headphone may not be quite in the same class as the DT 1770 and DT 1990, however the Beyerdynamic DT 770 PRO 80 Ohm is an excellent headphone for the price. The DT 770 PRO 80 Ohm headphone is truly a reference class headphone that will give you the advantage for your home studio but is still suited well for Studio A at a top-notch recording facility. You should definitely check it out.