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
