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I'll just leave this here.
The DT990 is a fully open headphone with very impressive bass. Though the treble is more pronounced in the whole line up of headphones. I classify this headphone as their fun and bassy one. One thing to note that the DT990 has the most recessed midrange of all three lines. . . -
The 32Ohm model for this headphone follows like the previous two lines. It sounds very much like the 600Ohm models, but has a far less refined tone to it. The bass in this model also seems a little sloppy compared to its other two incarnation and is slower sounding as well. The soundstage is still smaller like the other two lines, but bigger than the 32Ohm DT880. The midrange is fuller than the 250Ohm model, but is a lot more hollow sounding than the 32Ohm DT880. The soundstage is also wider than the 32Ohm DT880 with better imaging. . . -
The treble us a bit far too pronounced and covers the midrange, though it has better detail and extension over the other DT770 and DT880 models. It’s somewhat strident and can cause ear fatigue quite quickly for those who are sensitive to treble. The midrange, as stated above, is very shallow to almost nonexistent. Maybe that’s overstating it, but it’s very shallow sounding, but what can be heard is very detailed and transparent. The 250Ohm DT880 has a much fuller midrange, but the DT990’s has more detail and transparency to it. The bass is very prominent and takes over the sound. It makes the headphone sound darker. The impact on the bass is very impressive for an open headphone and it has more extension than the 250Ohm DT880, but lacks it’s texturing and layering. The soundstage easily beats the 250Ohm DT880 as this ohm rating of the DT990 is much wider and deeper sounding. . . -
The pro version follows the trend of the other two lines pro variants with a smaller soundstage, more bass, and more clamp. The treble seems smoother also because of the increased clamping force and aids the mids in coming forward. Bass seems to have gained impact but now there’s slightly more bass. Even more bass than the 600Ohm model, but not as controlled. The treble is smoother now from the added bass as it gets masked a tiny bit. The mids gain some body and the lower mids are more audible. . . -
The 600Ohm model is the definitive version of the DT990 and has the smoothest treble of the DT990 line. It’s also the most detailed treble of all three lines and offers the most extension. The midrange of this model is close to the 250Ohm DT880 and is rather shallow, but far more improved over the 250Ohm DT990. The DT990 600Ohm’s mids are a little bit more transparent and detailed over its 250Ohm counterpart, but not nearly as full sounding as the 600Ohm DT880. The DT990 still has a slightly more detailed midrange over the 600Ohm DT880. Bass on this model is just insane. It has so much impact and is so tight and controlled sounding it makes you question that’s it’s an open headphone. Also the bass is very snappy and fast, far faster sounding than the other DT990 variants. Really just the most impactfull and controlled bass I’ve heard from an open headphone. The soundstage also beats all the DT770 and DT880 models and is pretty wide and deep. The imaging though is just a bit better than the 600Ohm DT880, but not by much.
All subjective and dependent on source, of course :) To my older ears, the 250 ohm Premium with a warmish dac/amp was not at all strident, but if you're more sensitive and/or use a "harder" source I could see that they might be. "Sparkling" highs is how I'd describe them, and the highs on these 'phones are what gives them such an amazing sense of width and clarity IMO. Bass is awesome yet fairly well controlled and mids are indeed pretty recessed.
The recessed mids probably cause people to crank up the volume, which makes the bass and highs feel so forward in the mix. It's like having headphones with a "loudness" switch permanently on! Awesome for rock and electronic music. Less so for more vocal-centric music.
Woa, are these all your observations? I would love to compare them myself one day. But the things you said about 600ohm version - I completely agree. Bass on closed back headphones usually just comes from the structure and scaffolding of the cups. It may sound bassy, but you take them off, leave them on the table, crank them up, and - because the cup is now open to air - you cant hear any bass from the distance any more. The DT990 600ohm tho - it sounds like there is a little subwoofer in there, thumping out those low notes - and you can easily hear the bass from around the room!