The Beyerdynamic DT 770 Pro are well-built, durable and great-sounding closed-back headphones. They're a bit more versatile and have a slightly better Bass than the DT 990 PRO or DT 880 thanks to their closed-back design. However, they still leak a bit too much for quieter environments, and they're somewhat cumbersome to carry on you if you don't have a bag.
The Beyerdynamic DT 770 Pro are sturdy and durable headphones that look just like the DT 990 but with a closed-back design. They have a thick metal frame capable of withstanding multiple drops. The ear cups are amply padded and coated with a soft microfiber fabric that feels nice on the skin. Unfortunately, they're a bit tight out-of-box which may become slightly uncomfortable during long listening sessions. They're also somewhat bulky and cumbersome to carry around.
The Beyerdynamic DT 770 Pro basically look like a closed version of the DT 990 Pro. They have the same circular ear cups and a thick metal frame with a removable cushion strap. They have a utilitarian appeal that may not stand out in a crowd but still looks good enough to comfortably wear outside, despite being slightly bulky.
The Beyerdynamic 770 Pro are a bit too tight on the head. They're decently comfortable to wear for short periods and amply padded. The ear cups are covered with a soft microfiber fabric that feels nice on the skin, and they fit well around most listeners' ears. Unfortunately, like the DT 990 PRO, they clamp the head a bit, which gets uncomfortable after a while. The headband may become looser over time but out-of-the-box, they do not feel as comfortable as the DT 880.
The DT 770 are durable and sturdy headphones. They have the same solid metal frame as DT 990 Pro, and the ear cups are dense enough to handle drops without getting damaged. However, the ear cup enclosures feel a bit plasticky, especially when compared to the premium build and feel of the DT 880s' ear cups.
The Beyerdynamic 770 Pro are sufficiently tight on the head that they won't fall during casual listening sessions, unless the non-detachable cable gets hooked on something. However, they're too bulky to run with comfortably. The large ear cups will slide off your ears under high physical activity, so like most critical listening headphones, they won't be ideal to take to the gym.
The Beyerdynamic DT 770 are great-sounding closed-back headphones. They have an excellent and extended Bass, a nearly flawless Mid-Range reproduction, and very good imaging and distortion performance. They sound better than the Sony MDR-7506 and as good as the Audio-Technica ATH-M50x. However, unlike the M50x, their Treble is a little on the bright and sibilant side. This means they could sound slightly sharp on some tracks and they don't have the most open Soundstage due to their closed design. Unfortunately, their Bass response can also vary a bit from one individual to another.
Very good Bass Range performance. Low-bass is flat and extended down to 10Hz, which is excellent. Bass is also re-produced virtually flawlessly. However, high-bass shows a bit of underemphasis which makes the lead/vocals slightly thin. At 2.6dB this effect will be quite subtle though.
Excellent Mid Range performance. The response is virtually flat and within 1dB of our target, which is great.
Good Treble Range performance. The overall response is rather inconsistent. Low-treble shows a narrow 5dB dip at 3.5KHz, but because of the narrow width the effect will be subtle. Treble and high-treble are overemphasized by an average of 2.5dB, making the sound of these headphones a bit bright and sibilant.
Mediocre consistency. The Bass Range of our Over-Ear and On-Ear headphones are measured on 5 different human subjects, 5 times each. In the graphs, each line represents an individual's average Bass response. The closed-back Beyerdynamic 770 Pro shows about 6dB of variance at 30Hz depending on the individual, which is significant. The red line belongs to an individual who wears glasses. On the other hand, The amount of variance in the Treble Range is low, which is good.
Very good Distortion performance. The amount of harmonic distortion in the Bass Range is on the high side, but harmonic distortion in the lower frequencies are not very audible to humans. The performance in the Mid and Treble Ranges are very good and don't change too much under heavier loads either.
The Beyerdynamic DT 770 have an average noise isolation performance. They block enough ambient noise, to commute via public transit and to use in moderately noisy settings. However, they won't isolate well enough for louder environments, especially, if you don't have any audio playing. Unfortunately, despite being closed-back, they're still quite leaky at higher volumes. So some of what you're listening to will bleed out, which depending on the situation could be distracting to those around you.
Mediocre Isolation. The Beyerdynamic 770 Pro isolate passively, using their closed-back ear cups. Therefore, they do not block any noise in the Bass Range. In the Mid Range they achieve a decent 13dB of reduction, and in the Treble Range they perform well by reducing the outside noise by an average of 30dB.
Poor Leakage. The main issue here is that significant portion of the leakage sits between 400Hz and 10KHz which is relatively broad range. However, the overall level of leakage is not very loud. So the sound leaking out of these headphones will be rather full and Mid-Rangy, but not too loud.
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The Beyerdynamic DT 1770 PRO are better-built headphones than the Beyerdynamic DT 770 model thanks to their detachable cable, but overall, for the price difference, the DT 770 offer better value. Both sound signatures of these headphones are very similar, and their design is basically the same. You do get a big hard case and an extra straight detachable cable with the DT 1770, but that’s about it.
The Sennheiser HD 820 are a slightly better closed-back critical listening headphone than the Beyerdynamic DT 770 PRO, but not by much especially considering the price difference between the two headphones. The HD 820 have a much better and more premium build quality. They also have more spacious and well-padded earcups that are breathable enough to wear for much longer than the Beyerdynamics. They come with more high-end cables and accessories and do not sound as sharp on vocals and instrumentals as the Beyerdynamics. On the other hand, the Beyerdynamics offer a better value for their price with a more consistent bass reproduction and a fairly even and neutral mid-range. They're also decently well built and comfortable enough for most, although they can be a little tight on the head for some.