I can't say I've noticed any drop in sound quality and I use a headset all the time for playing games. Though it must also be said that my hearing is not the best - in fact I've had to have numerous operations on my ears, wore a hearing aid for a brief period and I used to have grommets in both of my ears though I think I just have one left now (I know it may seem weird that I'm not certain but there you go).
Currently reading... The Servants of Twilight by Dean Koontz
"Time is an illusion. Lunchtime doubly so."