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Sanders Sound Systems Model 11 with Back-Wave Absorber

Click on links for full set of plots.


Horizontal directivity plots

Sanders Sound Systems Model 11 with Back-Wave Absorber H Contour Plot

Full horizontal contour plot

Directivity index plots

Sanders Sound Systems Model 11 with Back-Wave Absorber Horizontal DI Plot

Horizontal plane directivity index plot

Constant directivity metrics plots

Sanders Sound Systems Model 11 with Back-Wave Absorber Horizontal Polar XCorr Plot

Full horizontal NACC plot


Measurement notes:

  1. Date performed: 18 June 2013
  2. Nominal measurement distance: 1.6 meters
  3. Transducer type: electrostatic; transmission-line dynamic
  4. Exponential sine sweep settings:
    • Frequency range: 1 Hz to 22 kHz
    • Duration: 5 seconds
  5. Impulse response window settings:
    • Type: Tukey (cosine fade-in, flat, cosine fade-out)
    • Duration: (0.5, 1, 0.5) msec
  6. Frequency resolution: 500 Hz
  7. Spectral smoothing: 1/24th octave
  8. Directivity index averaging range: 500 Hz to 20 kHz
  9. Alignment: The microphone was aligned with the center of the electrostatic panel and the axis of rotation passed through the center of the panel enclosure.
  10. Additional notes: The back-wave absorber (BWA) used in these measurements was designed and fabricated by Sanders Sound Systems specifically for use by the 3D3A Lab. The BWA consists of a sheet of acoustic fiberglass (from ATS Acoustics) of the same dimensions as the electrostatic panel. The BWA was suspended directly behind the panel (approximately 30 cm away) by aluminum bars mounted to the frame of the electrostatic panel.

Sanders Sound Systems Model 11 Photo
(BWA not shown)
Manufacturer website