Here's an approximately two-hour interview with John Curl by Brian Anderson and David Gans regarding the Wall of Sound.  I haven't sat through the whole interview, yet, but when I saw this I was excited to get it posted for y'all!  Great description of Ron W. stating at 23:42.

Bill, tgo

That is very cool.  I started at the 23:00 mark and got sucked in... stopped at Wall of Sound Speakers & Drivers.  Seriously fascinating and enlightening.   
Looking forward to the rest.

I'll listen tomorrow in my shop. (ironically, on what might possibly be the crappiest Bluetooth speaker ever made...)

I've started in on it.  Thanks for posting!

Just finished watching; enjoyed it!