So the bump is older than your headset?
for the record I have a set of Turtle Beach EarForce HPA2 that I have used for a couple of years with out any trouble.
I've been using the $30 used HPA2 set I got at my last post and they're still holding up just great! Ends up the notch that holds the mic was broken on the replacement set so just for S&Gs I hooked up the amplifier for the HPA2 set to my original headset and it sounds great again! Ends up it wasn't the speaker that was going it was the amplifier for the USB set!
The sound is even better using my on board surround instead of a USB interface and the computer seems a bit snappier too! No more "micro-stutters" when firing the guns etc... and I have a spare heaset for parts should I ever need it.
It's good to know how cheesy the Z6A is so I can avoid those later on.