Originally Posted by
Giskard
JBL has always specified a subenclosure volume of ~ 80 cubic inches for the LE5.
The ratio of the inside diameter of the subenclosure and it's depth is usually roughly equivalent to the "Golden" ratio:
(SQRT(5)+1)/2 or ~ 1.62 : 1 : 0.62
The inside diameter of the tube is often 5.3125"
On some models they purposely tilted the closed end of the subenclosure so it wasn't parallel with the baffle.
The 3.5 mH inductor having 7.5 ohms of DCR is set to smooth out the impedance peak of the LE5x in this sealed volume.