Measurements:

Test Notes: Off axis and polars measured using a Celestion CDX1-1731

Mic distance 1m, measurements gated at 5ms and are smoothed at 1/48 Octave.

Final Notes:

Very interesting horn design with horizontal lobes that protrude into the center before widening. Dispersion pattern of this waveguide appears to be a little wider then the spec roughly 100 H x 60 V, though the profile on this clone might not be identical to an official JBL version. Horizontal dispersion is mostly consistent except for that narrowing at 12-13k. Vertical is more uneven and interestingly widens at the top end opposite of most. Since the waveguide dimensions are square low frequency pattern control is similar on both axis though the vertical coverage begins to widen a little earlier because it uses a tighter angle.