snhirsch Posted October 24, 2015 Report Share Posted October 24, 2015 I interned at Advent (Putnam Ave facility) after my freshman year at college in 1970. My nominal assignment was to work out and document the mechanical and electrical alignment procedure for the Model 100 cassette deck (original unit w/ Nakamichi transport). During lunch, the techs and I would sit in the 4-channel demo room and fire up the tunes. Henry was doing a lot of R&D into 4-channel sound based on a 4:2 encoding scheme invented by Peter Scheiber. The listening room was equipped with a pair of Advent speakers (wired parallel for 4-ohm load) in each corner, driven from a pair of Crown DC-300 power amps (first I'd ever seen and awesome for that period). Program source was a Crown discrete 4-channel tape deck that likely requred the floor underneath it to be reinforced to carry its weight :-). One could sit on a stool in the middle of the 20' x 20' room and switch between direct 4-channel and a path that did 4:2:4 through the Scheiber encoder and decoder using a hand-held button. My personal favorite was the first Chicago album, remixed to 4-ch from the original masters. You cannot imagine what it sounded like when cranked through all that gear. Still makes me smile (sorry for the pun, Chicago fans).At trade shows, the speakers were demoed with more modest amounts of power (in deference to the other booths). Unless I have this scrambled after all these years, Andy Petite (marketing and sales director) used the first Pentangle album as the primary demo source, but it had to the be the UK version (uncompressed master and far better vinyl - we had an entire steel cabinet full). There's a drum solo on the tune "Pentangling" that's so nicely recorded that you can hear the air "whooshing" around the brushes. Great way to show off the tweeters. I really loved the production jig they used to form the tweeter domes. Only Henry could start with plastic pipe, a water tank and a vacuum cleaner and have such musical devices emerge. Link to comment Share on other sites More sharing options...
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