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Details: Parent Category: Products; Category: Loudspeaker Measurements; Created: 01 June 2012

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.

Setup

Microphone measuring position: middle of tweeter
Grille: on

Frequency response and sensitivity

Sensitivity: 87.50dB (averaged 300Hz-3kHz, 2.83V/1m)

Chart A: 20Hz - 20kHz (measured @ 2m, plotted @ 1m)

fr_on1530

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)

fr_456075

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)

fr_listeningwindow

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)

thd_90db

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)

dev_90db

Impedance magnitude variation

impedance

Vertical axis: impedance
Horizontal axis: frequency

Electrical phase

electrical_phase

Vertical axis: phase
Horizontal axis: frequency

Details: Parent Category: Products; Category: Loudspeaker Measurements; Created: 01 June 2012

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: The BP-8080ST loudspeaker shows a frequency-response anomaly between 200 and 500Hz when the measurement microphone is placed in front or to the rear of the cabinet. This is because of how the midrange drivers are configured -- the soundwaves they produce “wrap around” the cabinet, causing cancellations in front of and behind it. Because of this, we performed additional frequency-response measurements on a customized speaker supplied by Definitive Technology that allowed us to measure the combined output of the tweeter and midrange drivers on the front baffle, to get a better indication of the speaker’s true frequency response. We also supplied a measurement of this customized speaker’s bass output only. We published these additional graphs below in the “Frequency Response and Sensitivity” section (charts C and D).

Because the BP-8080ST also displayed quite-low distortion at levels of 90 and 95dB, we published additional graphs of “Total Harmonic Distortion + Noise” and “Deviation from Linearity” at levels of 100dB, which we don’t normally do.