So I have the Turtle Beach X12s, and this pair I've had for maybe over a year. I've had to get new ones every year, but that's not really important right now. I started to watch a YouTube video, and now it sounds like treble is going way over bass. I tried listening to something on spotify, and it does the same thing. I can barely hear the vocalist, and the guitars are way too loud. I don't know if this is enough information, but I really don't want to get a new pair. The sound is very faint, also. It sounds like they just decided to not play bass any more.