Originally Posted by
toddalin
I assembled a couple sets with the 1/16" plate material. I did one set in the original angle and another set with the angle raised about 4 degrees.
When I put them up next to the JBL plates, I found that my initial angle was about 2 degrees lower than the JBL angle, and the revised angle was about 2 degrees higher. This actually makes a difference in the overall sound, but changing from 1/8" plates to 1/16" plates made more difference.
With the 1/8" plates, the "swish" of pink noise became more of a "swoosh." The JBL plates didn't do this and the "swish" was still distinctly a "swish." The 1/16" plates, especially with the higher angle, left the "swish" a "swish" but added the lower range as the 1/8" plates did, more so than the JBL plates. The lower angle added a bit more in the lower range, but took out a bit more over 4kHz.
I've revised the angle to essentially match that of the JBL plates and will go with that. The overall frequency response improvement way exceeded expectations, and I've not even begun to look at the increase in horizontal dispersion.