I've been using testing these recent days.. One thing I noticed with DT770-80 is that you should wear them very tightly gripped on your head, almost not letting them go over your ear.. Mine is set at tightest possible headband setting . If you wear them loosely, you will gain 5-10dB treble and they will sound ****ty and sibilant. With a tight fit you may lose some soundstage but the sound is much much more balanced..
hmm .. I had cut the plastic grill in half on my Portapros. Result is much more natural sound with better dynamics and imaging. They are still crap, but at least they are now listenable. Drums sound tighter and punchier, bass has slightly less overhang. If you plan to mod them AT LEAST remove the mid-piece from the plastic grille. No need for a drill.
I just bought this kangertech sub-ohm kit (which is fantastic, by the way!) but there's a problem like, everytime I vape it longer than 2sec it makes this "slurp" sound.. Like someone sucking a dick in a cheesy porn movie..,. you know.. Does anybody else have experience with this "slurp" sound and to get rid of it?