The Beyerdynamic DT 990 PRO are sturdy critical listening headphones. They deliver an excellent audio reproduction but their open-back design is not ideal for everyday casual use. They will leak a lot, even at low volumes and don't block any ambient noise. They're also a bit tight on the head.
The Beyerdynamic DT 990 PRO are sturdy, ruggedly built headphones. They look just like the DT 770 but with an open-back design. They can easily handle a few drops without getting damaged. The ear cups are well padded and fit around most listeners ears comfortably. They're also surprisingly stable, although, they're not designed for gym use or sports. Sadly, they're a bit bulky and a little tight on your head, which can get uncomfortable during long listening sessions. They also don't offer any audio controls.
The Beyerdynamic DT 990 are decent-looking reference headphones. They have a relatively compact and utilitarian design. However, the materials used in their build gives them a little more flare and high-end appeal. The ear cups are covered in a suede-like fabric. The headband is completely made out of metal and has a stylish and detachable padding cover.
The Beyerdynamic DT 990 PRO are comfortable headphones but a bit tight on your head. They have well padded and large ear cups that fit comfortably around most listeners' ears. However, the headband is a little too rigid which make the headphones tight enough to become uncomfortable during long listening sessions.
Like the DT 770 and the DT 880, the Beyerdynamic DT990 PRO are not designed to be highly portable. They're big and bulky and do not fold into a more compact format or have swiveling ear cups that lay flat to take up less storage space. They are on the larger side for over-ear headphones and would only fit in a bag or a big purse.
These headphones come with a soft pouch that doesn't add much bulk but also does not offer much protection. They would be safe from scratches but not from falls. On the upside, the fabric is somewhat waterproof and will shield the headphones from minor water damage.
The Beyerdynamic DT 990 Pro have a solid, sturdy build. The headband has a rugged metal frame that can handle a decent amount of physical stress. The open-back ear cups are, unfortunately, made of plastic which makes them less durable compared to the rest of their build, but they are dense enough, to not get damaged from a couple of drops.
The Beyerdynamic DT990 headphones are moderately stable on your head. They are not designed for sports and will slip off your ears during high-intensity physical activities or while running. However, the tight fit these headphones provide is more than enough to keep the headphones on your head during casual listening sessions.
The Beyerdynamic DT 990 Pro are a very good sounding and impressive pair of open-back headphones. They have a consistent, well-extended and excellent Bass Range, especially for an open-back design. Also, their mid-range is nearly flawless and their Treble is very well-balanced. However, like most open headphones, they still lack a little bit of sub-bass, and their Treble tends to be sharp and sibilant. Additionally, due to their open-back design, they have a relatively open and spacious Soundstage.
The Beyerdynamic DT990 PRO are not designed to isolate listeners. They leak a lot and are supposed to, as it improves their sound quality with a more open and spacious soundstage. Sadly, that means they're not headphones you would casually wear in public because their loud leakage will be distracting to the people around you. They also don't block any ambient noise so they won't fare well in loud environments or on noisy commutes. If you need a more outdoor-friendly headphone, to use in public transit, then maybe consider the ATH-M50x instead. They're one of the few headphones that sounds sufficiently good enough to compete with the DT 990 Pro despite being closed-back.
Poor isolation. Due to their open-back design, these headphones don't offer any isolation below 1KHz. Above 1KHz, there is a 4dB/Octave roll-off present, which will have a minimal impact of blocking outside noise.
Poor leakage. Although the profile of the leakage is quite broad, wider than K702, the general level is lower than most open headphones we have measured. Yet, these headphones still qualify as very open and not suitable where privacy is needed.
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