L100 midrange chambers are quite small
I had asked a similar question in another thread without a satisfying answer. The JBL component series instruction manual from 1980, posted elsewhere here, also recommends 80 cubic inches, typically 4.5 internal diameter by 5 inches deep. However, all the L100s and 4311s I have opened up have much smaller midrange chambers, about 4.090 ID by 3.25 deep, or about 42 cubic inches before stuffing. Why would JBL undersize, by almost a factor of two, the midrange isolation chamber in these? :hmm: If you look at how much space the back of the LE5-2 takes up, combined with the acoustic stuffing, there's almost no airspace there. Let me know if you have any good thoughts about this.