For the dub stage and for any given control room / recording space:
1. no dimensions equally visable by another dimension. 40x20x10 bad.....
2. minimum number of parallel sides
3. for a dub stage, room volume is important, distance between screen and mix position, speaker placement, and room EQ.
Other than that is, size is more about availble space and what you're going to put in it.
here's a link to a java coded room calculator and some other info http://www.mcsquared.com/metricmodes.htm http://www.mcsquared.com/java.htm http://www.dolby.com/professional/mo...cture/faq.html http://www.johnlsayers.com/phpBB2/index.php