Altec 511B horn compared to the GPA MR931

[Alien_Shore]

Thanks for the analysis and comments. This evening, I tested the same three horns on a brand new B&C DE250:
MR931 (Blue), 811 (Red), 511 (Grn)



I made sure to have the driver good and snug on the horn. I did notice that using the highpass settings in Holm were creating some weird issues (causing severe rolloff at 6k), so I turned that off and things returned to normal. It is odd that the 511b creates that spike at 950 in opposition to droop there for the other two horns. What would cause that? (perhaps the ringing? I'll try that horn again with some dampening on it and verify...)