- Yes, I have mentioned that the inclusion of vanes appear to help the loading ( & directivety ) of the lower frequencies ( ie; the first couple octaves above crossover ) / more than being there to help in the dispersion of the HF.Originally Posted by pos
- Since I have no Smith style horns here to measure / my opinion is strictly conjecture at this time.
- My opinion is derived from a visual study of info ( on pg. 51 ) in Harry F Olsons' book, "Acoustical Engineering". Here , his studies depict the horizontal response of a horn which he classes as a "parabolic". The pictured horn is clearly of the same class as a Smith type except that it lacks the internal vanes. It is 1/2" entry, with the top and bottom plates also spaced 1/2" apart. The side-walls form a 90° angle. The bell lips are 12" deep
- The picture shows a very "beamy" horn from 1100 hz to 4400 hz. This is shown to be clearly related to the radius of the horn ( 12" depth in this case ). Olson chooses frequencies of study that are multiples of "R" ( or the primary bell depth referenced against a wavelength, in inches ).
- 8800hz to 17600 hz shows an increasingly smooth and wide horizontal spread, as frequency is increased.
Yes, it becomes a matter of choosing your poison . One such compromise is to go the Westlake route and use 2 Smith style horns ( one with vanes for MF and an another HF horn that's lacking in vanes ).Originally Posted by pos
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