"dave weil" wrote in message
...

"Several sets of preferred ratios have evolved which work well
practically as well as theoretically. Three of these a

1 : 1.14 : 1.39
1 : 1.28 : 1.54

It just so happens that the second one corresponds to a room with an 8 foot
ceiling (don't know how tall normal ceilings are "abroad"), a 10' wall, and
a 13' wall. That's pretty darn close to the 3m by 4m mentioned by zigg.