These are my impressions on two headphones and soundcards i own: 70-s dt 48 25 ohm VS 70-s pioneer monitor 10 and e-mu 0404 usb VS tc electronic konnekt 6
Both headphones deserve much better system and both reveal e-mu is not flat at all, mids recessed, grooved up sound, its like its meant for speakers or headphones with artifficial sound stage, because it has a very narrow sound stage (0404). separation is decent, mix is comming out in a listeners manner (dt48 is bored, because of lack of detail and monitor 10 gave up on this card), its a very budget sound, limited and shaped for the majority.
konnekt 6 on the other hand is on a whole new level compared to emu, which at this point seems like a toy, plastic, cheap pots, sound limited...
Konnekt 6 has a better extensions on both ends, low end is flat, highs a bit digital sounding (not as real as i want), mids flat and detailed as F compared to emu 0404... its like emu made everything further away, but then further shrink it to fake the separation... Synergy between dt48 and 0404 exists, because dt48 brings out those recessed mids, but its too late to fool ME on this subject, emu... dt48 is the best this interface will ever sound... *it also sounds better trough main out than trough hp amp...
Now dt48 vs monitor 10 trough konnekt 6:
To every person who never heard dt48, monitor 10 will sound like a next level compared to dt48, bUT i aint every person, i had dt48 1 year more than pioneer, so... To me, dt48 is at least 2 classes above monitor 10. Its not true that there are similarities between the two... monitor has a wide soundstage, with EXCELENT separation, great detail, transparent, they sound as its a studio speakers... below 100hz is present and bass is pretty flat, it does seem a bit exaggerated with the bass... But it surprisingly doesnt ruin the monitor capabilities, if i were mixing in a studio, i would mix it with monitor 10 over dt48, but i would use dt48 when listening and mastering single instruments, vocals, not because they are a bit better than monitor for this, but because they are 10X better...Yea, on a "uniquess" of sound, monitor 10 gets 1, where dt 48 gets 11... Its outta this world hp, no wonder people call the dt48 fanbase: a CULT... dt48 brings everything that recording had INSIDE of your head, while monitor 10 (and the rest) try to simulate a set of speakers... Speed of dt48 also makes them seem classes above monitor 10 and it doesnt have animal corpse all over it...
Listening to dt48, even the songs on a SAME album sound so different... which is not the case with ANY other hp... It can easily be missunderstood as colored presentation, but its the recording thats presenting its colors, dt48 just shows it to you...
All that said, monitor 10 is still outstanding hp, better than all modern hps i tried, including dt990, hd380 pro, hd25, m50
I had a opportunity to compare monitor 10 vs hd25ii trough midas pro 2, with live band, so i listened to only snare, kick etc, a-b ing with the two...
Long story short: hd 25 seems more hazy, with even more bass, but its a really good hp compared to something like ath m50...
Sound stage is better with pioneer and deteail as well...