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Equipment Measurements

July 2006

NHT Xd Loudspeaker System: Measurements

PLEASE NOTE: The NHT Xd loudspeaker system is a four-piece active system comprised of two speakers (XdS), one subwoofer (XdW), and its own dedicated amplifiier (XdA). Other than where noted, all measurements are of a single XdS speaker with the XdW subwoofer, with the XdW's subwoofer at the "3 o'clock position,"the "mode" switch on the XdA in the top position, and with a 100mV input signal. Because this is an active system, measurements of sensitivity, impedance and electrical phase are not applicable.

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 low distortion levels under those conditions, we have added a second measurement performed at 95dB to give an indication of performance under higher-output conditions.

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: tweeter axis

Grille: off

Sensitivity: n/a

Frequency response, XdS+XdA, 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, XdS+XdA, 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

Additional Measurement
Frequency response, XdS only, 20Hz - 20kHz (measured @ 2m, plotted @ 1m)

Curve: on-axis

Additional Measurement
Frequency response, XdW only, 20Hz - 20kHz (measured @ 2m, plotted @ 1m)

Curve: on-axis

Chart 2 - Listening Window

Listening Window, XdS+XdA, 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 @ 95dB, 50Hz - 10kHz (measured @ 2m)

Top curve: frequency response @ 95dB SPL
Bottom curve: THD+N @ 95dB (50Hz - 10kHz)

Chart 4 - Deviation from Linearity at 90dB and Above

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

Curve: difference from 70dB at 90dB

Difference @ 95dB, 50Hz - 20kHz (measured @ 2m)

Curve: difference from 70dB at 95dB

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