From what I recall without looking it up, yes. But I'm not
about to go putting dimples into _any_ aluminum cones.
Apparently J. Krutke got good results out of the driver
with use of a BSC which he describes at zaphaudio.com I built
his highboy enclosures for use with the computer here: desktop
box at 16 in high for ear level. But I never cared for the
sound esp. sealed. I ran them bare with no circuit correction
because I am electronically challenged.