Understanding How To Time Delay Speakers

I love vintage articles.  This site is filled with them, and I'll tell you why:  

1. Some of THE best educational material regarding audio engineering was written before the internet took shape.

​2. I don't care whether I write everything on this site.  I have no pride in this regard.  My #1 goal is that you'd learn audio!  So with that in mind, enjoy this vintage article written by Chris Foreman when he was with Altec.
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