Bliesma T25B

9/26/2020 initial post

11/28/2020 added 6" waveguide

note: the spike near 48khz in the plots below is probably an artifact of the sound card cutoff doing wonky things with the FFT math

5" waveguides

note: 5" 68 vA is an elliptical mouth with an aspect ratio of 1:.68

6" waveguide:

6.5" waveguide