Originally Posted By: gonk
I do recall there being an option in the spec for the .1 channel to be used as an additional full-range channel
Good article from Secrets about various height channel attempts with multi-channel music:

http://www.hometheaterhifi.com/volume_8_4/dvd-benchmark-part-6-dvd-audio-11-2001.html

Scroll down to the middle of the page, under the heading 'Raising the Roof of Your Listening Room'.
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Sanjay