All loudspeaker measurements are performed independently at the National Research Council of Canada. All measurement data and graphical information displayed below are the property of the SoundStage! Network and Schneider Publishing Inc. Reproduction in any format is not permitted.
Note: The SP1 electrostatic panel operates as a dipole, radiating energy forward and rearward. Since the anechoic chamber absorbs all rearward-directed energy at the frequencies the panel operates, that output does not get reflected in the sensitivity measurement, which is therefore lower in our measurements than in reality.
Setup
Microphone measuring position: center of electrostatic panel
Grille: off
Frequency response and sensitivity
Sensitivity: 80.5dB (averaged 300Hz-3kHz on Listening Window, 2.83V/1m)
Chart A: 20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Top curve: on-axis response
Middle curve: 15 degrees off-axis response
Bottom curve: 30 degrees off-axis response
Chart B: 20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Top curve: 45 degrees off-axis response
Middle curve: 60 degrees off-axis response
Bottom curve: 75 degrees off-axis response
Listening window
20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Response curve is an average of five measurements: on-axis, 15 degrees left and right off-axis, 15 degrees up and down off-axis
Total harmonic distortion + noise
Chart A: @ 90dB, 50Hz - 10kHz (measured @ 2m)
Top curve: frequency response @ 90dB SPL
Bottom curve: THD+N @ 90dB (50Hz - 10kHz)
Deviation from linearity
Chart A: Difference @ 90dB from 70dB, 50Hz - 20kHz (measured @ 2m)
Impedance magnitude variation
Vertical axis: impedance
Horizontal axis: frequency
Electrical phase
Vertical axis: phase
Horizontal axis: frequency