Discussions about products that are not developed with objective methods, or the people who make them, are never productive. The DT 990 Pro are open, diffuse-field equalised headphones from beyerdynamic that has enjoyed great popularity since its launch in the 1980s.

Beyerdynamic dt990 32 ohm vs 250 ohm? - Head-Fi.org Beyerdynamic dt990 32 ohm vs 250 ohm? - Head-Fi.org

In fact, the E10 may even be enough without an external amplifier, since its power output into high impedance headphones is about 80% of that of the E11, which actually translates to a difference of only 1 dB.I'm forgivable in that matter but on DT990 I could hear much more unpleasant artefacts that together with the not-so-great production quality of Trance make the listening experience much less fun than with consumer-grade headphones or even DT770. This means that they’re at their best when connected to a high-level signal from the headphone output of a studio headphone amp or audio interface. And I can't blame only dynamic compression which is usual;y too high in modern electronic music because this problem appeared even in older tracks that I know weren't treated with compressors (or just a tiny bit). I have these and they're my "I need audio at my computer and don't feel like wearing Audeze" headphones.

beyerdynamic DT990 Pro 250-Ohm (Black/Silver) | DV247

In 1937, Eugen Beyer developed the DT 48, the first set of dynamic headphones, followed two years later by the M 19 dynamic microphone. While the 770 PRO is designed mainly for programming, tracking and monitoring, the 990 PRO’s intended remit is referencing, mixing and mastering, evidenced by the fact that the 990 PRO’s are an open-back design.Offering a hugely detailed, open sound and unquestionable comfort, the DT 990 Premiums have a lot going for them.