I cannot comment on the Sierra Brooks horns because, unfortunately, I have never heard them. However, I am very familiar with Dr. Edgar's horn, having extensively listened to them, and even build my own replica.

Bruce was kind enough to measure my horn and the measured response matched a response of his horns, consequently, my conclusion is that his measurements are not "doctored."

Bruce is very open with his measurements, why do not you contact him with your questions?

M