van den Hul also describes it on his webpage (along with a bunch of other interesting tid bits).
http://www.vandenhul.com/artpap/hifi_tipshints.htm#Section-2
He says 15 degrees is about right although some hifi show demos use 20 or so.
http://www.vandenhul.com/artpap/hifi_tipshints.htm#Section-2
He says 15 degrees is about right although some hifi show demos use 20 or so.