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Quad Electroacoustics ESL-57

Click on links for full set of plots.


Horizontal directivity plots

Quad Electroacoustics ESL-57 H Front Contour Plot

Frontal horizontal contour plot

Vertical directivity plots

Quad Electroacoustics ESL-57 V Front Contour Plot

Frontal vertical contour plot

Directivity index plots

Quad Electroacoustics ESL-57 Front Hemisphere DI Plot

Frontal hemisphere directivity index plot

Constant directivity metrics plots

Quad Electroacoustics ESL-57 Front Horizontal Polar XCorr Plot

Front horizontal polar X-Corr. plot


Measurement notes:

  1. Date performed: 27 July 2012
  2. Nominal measurement distance: 2.0 meters
  3. Transducer type: electrostatic
  4. Exponential sine sweep settings:
    • Frequency range: 1 Hz to 48 kHz
    • Duration: 5 seconds
  5. Impulse response window settings:
    • Type: Tukey (cosine fade-in, flat, cosine fade-out)
    • Duration: (0.5, 3, 0.5) msec
  6. Frequency resolution: 250 Hz
  7. Spectral smoothing: 1/24th octave
  8. Directivity index averaging range: 500 Hz to 20 kHz
  9. Alignment: Information not available.