My pal Ethan Winer is half of the company Real Traps and hosts a page of all sorts of articles and information about acoustics and control rooms at this site: Real Traps
One of my favorite pieces nearly ended up in Tape Op Magazine but after I realized Ethan had already posted it, and also how much better it worked online, I thought I'd post a link here: "How Does That Sound Look?" by Dan FitzGerald. It's a great article on using test equipment and tones to sort out a room's acoustics. Good stuff.
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