Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
This was described as a "rubber throat" in a paper written by Paul Klipsch in 1941 called "A low frequency horn of small dimensions". He proposes that his Klipschorn corner horn have an initial wide taper for the first eight inches corresponding to a 100Hz flare rate. The rest of the passages have a slower flare, corresponding to a 47Hz flare rate.