Originally Posted by
Steve Schell
Hi Thomas,
The Altec 612 cabinet began life as the bass reflex (resonator, as Jim Lansing called it) cabinet of the Lansing Iconic. I am fortunate to own several of these. When the Altec Lansing Duplex driver debuted, it was most often fitted to this box. If you have pictures of Abbey Road studios showing these enclosures, they almost certainly housed whatever version of the 604 was being produced at the time of their manufacture. The 604 in the 612 cabinet was so commonly used in recording studios for several decades that it was considered a true standard.
I have made careful blueprint drawings of the Lansing Iconic 612 enclosure; please email me if you would like a scan of the drawings. Later Altec 612s (of the same appearance) deviate only slightly from the dimensions of the original.