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I greatly enjoy your articles greatly, despite not being able to follow all the byways of electrical engineering. But, I have a couple of comments:
1: You seem very much against toe-ing speakers because it emphasizes high frequencies at the listening position and limits the soundstage. Yet you note that DVD-A/SACD surround mixes are usually done on setups conforming to ITU standards--which, as far as I can tell from diagrams, always show toe-ed in speakers all around, pointing directly at the listener.
ITU toe-in is very large indeed ... that was my point. If EQ cut is used I can understand how that might compensate for the effect you cite. But actually in my own 5.1 setup I use a large toe-in (NHT Superones all around, tweeters at or near ear level) and enjoy the sound--perhaps because I have lost ...
Source: HighBeam Research, Dear Mr. Rich.(FORUM)(Letter to the editor)