They are SQ drivers. Anemic Xmax (5-6mm) and pathetic Xmech (10mm). Though supposedly very nice sounding drivers. All were hand made IIRC. From what I hear, you can still get them through John Janowitz of Acoustic Elegance
Last time I checked, you can still get them at http://www.partsexpress.com
They are more of a SQ driver, you can also get some decent response from them in a concert hall environment, or guitar setup.