Hmm, I thought a drop top was when they used a very thin laminate, and then glue it to the top allowing it to bend across the contours of a carved guitar. From the Giffin website:
The Maple tops on the Drop-tops . . . [is] bent around the arm contour which is a comfort feature preferred by some people. The Maple is out of necessity fairly thin (about 1/8 of an inch), and it doesn't make a lot of difference to the tone . . .
Maybe that's just the way he does it though.
Edit: Okay from Anderson's site:
The Drop Top features a beautiful piece of book matched maple, koa or walnut that is actually bent (or dropped) over a tonewood back to create the same comfortable forearm contour of our other models. As a result of this design, we've chosen a top thickness of 3/16 of an inch which actually enhances and richens the sonic character of the instrument. The result is a guitar that not only plays effortlessly, is extremely comfortable, and sounds amazing but is so darn good looking that if you don't dress well it just may upstage you. All neck, electronic and bridge options are available.
Seems like one says it does something for the tone, the other, not.
(Message edited by hydrargyrum on April 05, 2009)