I am reminded by this subject, that while at Rutgers U., in the late '50's, I had the pleasure of visiting Hegeman's home and auditioning a stereo pair of his unusual design. The enclosures were large transmission-line loaded, with the woofer/mid mounted on top at a visible angle to the listener, and fitted with his own take on the venerable "whizzer" cone. They were driven by a pair of Dynaco amps, fed from a stereo reel-to-reel tape (RCA Menotti: Sebastian), and the sound was *fabulous*! I will never forget it.
John
John