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.
Notes: This loudspeaker uses an unusual topology in which each drive unit is powered by its own built-in amplifier, yet the system still requires connection to a conventional external power amplifier. As a result, the speaker exhibits extremely high voltage sensitivity. Based on our measurements, it would be capable of producing approximately 99.6dB at 1m with a standard 2.83V input. However, operating the speaker at that level could risk damaging the drive units. For this reason, all frequency-response measurements were conducted using a 1V input, which yielded an output of 90.6dB at 1m.
In addition, the speaker’s extremely high sensitivity prevented us from measuring impedance and electrical phase, because our test equipment requires a 2.83V input. Consequently, the impedance and phase charts shown were supplied by Sphinx and are identified as such. Although we do not typically publish manufacturer-provided measurements, we felt it was appropriate to include them in this case to present a more complete picture of the speaker’s performance.
Setup
Microphone measuring position: 37.75″ up from bottom of footers (approximately top of main enclosure, just below tweeter enclosure)
Grille: none
Bass Gain dial: Neutral (except as noted in one chart)
Frequency response and sensitivity
Sensitivity: 90.6dB (averaged 300Hz-3kHz on Listening Window, 1V/1m)
Chart A: 20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Horiztonal response from 0 to 75 degrees off-axis
Chart B: 20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Additional measurement to show output with Bass Gain switch set to Neutral (red) and +3dB (blue)
Curve: on-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: @ 84.9dB, 50Hz - 10kHz (measured @ 2m)
Top curve: frequency response @ 90dB SPL
Bottom curve: THD+N @ 90dB (50Hz - 10kHz)
Deviation from linearity
Chart A: Difference @ 84.9dB from 70dB, 50Hz - 20kHz (measured @ 2m)
Impedance magnitude variation (chart supplied by Sphinx Audio Engineering)
Vertical axis: impedance
Horizontal axis: frequency
Electrical phase (chart supplied by Sphinx Audio Engineering)
Vertical axis: phase
Horizontal axis: frequency