I've spent a bit of time with these heads when I am in my drum shop. The Vintage A's are actually a two ply head, in fact they were Remo's first ever drum head that wasn't made from some form of calf skin. The first ply of polyester film is 7.5mm, the second is 3-mil. A regular Emperor is two 7 mil plys of Mylar. Two different materials at two different thicknesses.
Looking for that tubby Bonham sound? These heads will do it for you! Also check out the Vintage Emperors. Those heads are AMAZING!
I hope this helps!
Cheers!
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