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one π loudspeaker performance data

one Pi loudspeaker
The one "π" loudspeaker is our original model, designed in 1978. It has been continually updated over the years to take advantage of the most modern materials, but the original design is still very much intact.

It satisfies three basic requirements: The first requirement is that it must sound great. The second is that it sound great with little input power. And the third requirement is that it be relatively inexpensive. To reach these goals, we've used only the most efficient components.

The end result is a loudspeaker that is efficient enough to work well with low-power amplifiers yet durable enough to handle high power, delivering high sound pressure levels. The bottom line is these speakers put out plenty of great sound.

The one "π" speaker is perfect for use as a surround speaker in high-SPL home theaters. It's high sensitivity also makes it a great choice for bedroom or dormitory systems where low-power amplification is used.

Frequency Response



  • 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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