Best DIY cab for D-131 and 1217-1290?

[Theo]

I have a couple of D-131s and 1217-1290s, and N1200 crossovers. I would like to build a cabinet for them. Was there actually a speaker containing this ensemble? Or a JBL approved cabinet plan? :confused: TIA

[speakerdave]

Simplest thing is to use the instructions in this 1975 enclosure guide. There are specs for both 5 and 8 cu ft cabinets:

http://www.lansingheritage.org/html/jbl/plans/1970s-kit.htm

Yes, I believe that is a system JBL sold.