Hi Rich
Yes i have that graph but it is for a perfect rectangular OB
it says in case of 100 Hz i need a rectangle of 32"x32"
this is very ugly in my eyes
so i will use a 20 inch width and more than 32"tall. I believe that it does not matter,
that i will still have a roll of beginning at those 20 inch width at 160 hz but when the baffle
is longer than 20 inch i will have a slower roll of say 4db/oct.
However if i stay at 20 inch i am short of 12 inch, that is 6 inches a side
If i make a Uframe behind the baffle ( a bit out of sight) i can regain those 6 inches.
Guitarretyp's OB baffle
Graham thx for the link I will try this out