I know that Emperor heads are two ply, but I have been using smooth white ones for a while on my Ludwig kit, and they seem to behave a lot more like single ply ones in terms of sound and response. With a clear two ply head, you can see the moire' pattern that shows up when the two layers of Mylar are in contact with one another, and you can feel the plies rubbing together when you press on the collar. With these smooth white (uncoated) ones, that is absent. If I had an old worn out one, I'd just cut it apart and see, but I only have the two I'm using on my toms.
Anybody have any info about them? Are they two ply or just one heavier ply?
Thanks