two π tower speaker performance data
 Frequency Response
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 Impedance
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Notes:
- All measurements were done halfspace, with the speaker resting in a cradle and the microphone suspended above it on a boom.
- No post-processing or smoothing was applied.
- Measurements were taken at a distance of 10 feet from the baffle and drive voltage was 8.62vrms. This is equivalent to 2.83v/M and 1W/1M values since average impedance is 8Ω.
- The loudspeaker was driven with a 60Hz sine at 20vrms to pre-heat for 15 minutes immediately before measurement. This was done to bring it to a realistic operating temperature.
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Helpful Documents and Software
 π Speaker Whitepaper explains the concepts and evolution of modern waveguide and constant directivity loudspeakers
π Speaker Crossover Document analysis of circuits used in waveguide and constant directivity loudspeakers
"Crossover Electronics 101" Seminar Handout
JBL Professional Sound System Design Manual
 Passive Crossover Spice models, complete with the AIM Spice modeling program
Pialign Analysis Software to help you design your enclosures. This is the old Altair original from 1977.
Plot the response curve of your design with Carlson's BoxPlot program
Plot the response curve of horns with the HornResp program
Convert Metric and Imperial measurements with the Madison Measurement Converter
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