One of the folks on AK was talking about Hendrix's gear, and someone else posted a link to the Bill Hanley Sound site:
Here is a teaser ...
Because most of the audience would be perched high on the hill, Bill decided to build two speaker towers, each with two levels of speaker clusters, one high, (about 70 feet, to reach the middle and top of the hill,) and one much lower for the near audience.
This geometry sent the music directly to everyone's ears, without causing any backslap (echo,) because all the grass, and soil ...and the bodies of half a million fans, would absorb the sound, eliminating the unwanted resonances and reflections that we have to deal with indoors.
Bill designed and built his own speaker cabinets of marine plywood. Two "bass bins" were placed under a pair of high frequency horns, totalling about a thousand pounds and standing roughly 6 feet tall, 4 feet deep, and 7 feet wide.
Each of the four upper level bins was loaded with four 15-inch JBL D130 drivers with a loudness maximizer compressing the sound to improve reach.
Each of the four lower bins was loaded with four 15-inch JBL D140 drivers for extended bass.
The high frequencies were handled by model 1003B, 5x2 Altec multicell horns (300Hz. min freq) and Bill's own custom built 2x2 horns, all with Altec 290 compression drivers.
You can read more here:
http://www.billhanley.org/projects/1..._15-woodstock/