I can't find a definitive answer, and know one of you will be able to straighten me out. (At least on this issue.) The JBL guide linked below is not clear to me, and I'm sure someone here can answer the quandary off the top of their head.
2205 driver
5.5 cubic feet
Free air 30Hz?
Two 4" ports.
On this chart: http://www.jblpro.com/pub/manuals/enclgde.pdf I feel line # 8 is the most appropriate. I also went to www psp-inc.com, and entered the data, specifying two 4" ports, and got 10.76", which is comfortingly close enough to JBL's 11".
The question that I cant resolve is if I need both ducts to be 10.76 inches each, or each to be half that, for a total combined length of 10.76?
I have had the speakers for some time, and the ducts are about 5" each. They don't sound bad, but since I am going to have them apart for refinishing, now is a great time to resolve this nagging issue.
Thanks so much,
SDaniel