Quote Originally Posted by voice of the theater View Post
The cabinets are Heathkit AS-101 cabs from the 1970's (I used to own a pair--they are similar to the Altec Flamencos) with new grill cloth and internal modifications to accommodate the Altec Duplex drivers that are in there now.....
Are you sure this isn't a Heathkit as is or an Altec custom done by Barzilay? I mean it looks too professional/extensive to be a re-work of a 101, plus (and it's a big plus to me) it's a double bass reflex (DBR) tuning which was virtually unknown (and still is to great extent) at the time except in professional circles and serious DIYers that read a variety of audio magazines.

For sure, it's the first I've seen from back then beyond its inventor George Augsberger's early '60s JBL cab. There's software to design them now, but back then it was strictly empirically tuned, at least at the DIY level.

GM