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Equipment Measurements

December 2007

JansZen Model One Loudspeakers: Measurements

PLEASE NOTE: Our standard is to provide the THD+N measurement at 90dB with a measuring distance of 2 meters (within the anechoic chamber). Since this speaker produced some distortion anomalies at this level, we have added a second measurement performed at 85dB to give an indication of performance under lower-output conditions, as well as a corresponding Deviation from Linearity measurement at the same level. Furthermore, since this is an active speaker, meaning that it has has built-in amplification and is driven by a line-level signal, measurements such as sensitivity, impedance and elctrical phase are not applicable.

All  loudspeaker measurements are performed independently at the National Research Council of Canada. Please click to learn more about how we test loudspeakers there. All measurement data and graphical information displayed below are the property of SoundStage! and Schneider Publishing Inc. Reproduction in any format is not permitted.

Chart 1 - Frequency Response and Sensitivity

Microphone measuring position: 39" up from bottom of speaker

Grille: off

Sensitivity: n/a

Frequency response, 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

Frequency response, 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

Chart 2 - Listening Window

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

Chart 3 - Total Harmonic Distortion + Noise

THD+N @ 90dB, 50Hz - 10kHz (measured @ 2m)

Top curve: frequency response @ 90dB SPL
Bottom curve: THD+N @ 90dB (50Hz - 10kHz)

Additional Measurement
THD+N @ 85dB, 50Hz - 10kHz (measured @ 2m)

Top curve: frequency response @ 85dB SPL
Bottom curve: THD+N @ 85dB (50Hz - 10kHz)

Chart 4 - Deviation from Linearity at 90dB and Above

Difference @ 90dB, 50Hz - 20kHz (measured @ 2m)

Curve: difference from 70dB at 90dB

Additional Measurement
Difference @ 85dB, 50Hz - 20kHz (measured @ 2m)

Curve: difference from 70dB at 85dB

Chart 5 - Impedance Magnitude Variation and Electrical Phase

n/a

 

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