I'm having an issue again now with the SQ but only because I took the tissues out I had in. I tried putting somr new pieces in and I believe I put too much in as the sound dulled. Too little though and they do nothing. I muat have put Just the right amount the first time... damn.
It's all about the thickness. Trust me and it's very picky. I've had the same problem with my Q40 that I've been used with tissues in the cups, I was gonna replace them with newer just for the heck of it even though it didn't really need replacing and well I immediatly noticed it sounded a bit off as the tissues were slightly too thick or well hasn't been settled in like the old ones which are more pressed compact due over time. So ended up putting back the old tissues and everything was fine again.
On my Q40 if the tissues are made too thick then it results in; more distant midrange, thinner sound but bigger soundstage as it's not so "in-your-face", it becomes more laid-back but brighter/colder so to speak instead of warm and smoother and thicker and up-front and more vivid. I'm the guy that prefers a more up-front engaging sound (mainly due to non-recessed midrange), for me it's engaging when vocals are loud and in your face and instruments as well coupled with strong bass. I get bored if I get the Denon D1100 / DT770 sound with distant midrange and feel left out instead of being in the center of it. It's great for classical with the "distant" sound, it sounds more technically natural but I don't like to listen that way to other genres.
It really seems midrange is the first to become recessed as the distance between the ear and driver gets too far away, it makes sense, holding your headphone a bit away from your ears you hear mostly the bass + treble bit, not so much the mids (300 ~ 1000Hz, lower-midrange especially where the thickness to music comes from).
Edited by RPGWiZaRD - 1/12/13 at 9:26am