Objective Speaker Comparisons
http://www.soundstageav.com/speakermeasurements.html
I see the Polk Lsi9 is on the list, however I'm blocked at work from seeing it.:mad:
I see the Polk Lsi9 is on the list, however I'm blocked at work from seeing it.:mad:
Post edited by PolkThug on
Comments
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Polk Audio LSi9 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 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, including graphical information displayed below, is the property of SoundStage!. Reproduction in any format is not permitted.
Chart 1 - Frequency Response and Sensitivity
Microphone measuring position: tweeter axis (no grille)
Frequency response, 20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Loudspeaker sensitivity (averaged 300Hz - 3kHz, 2.83V/1m)
Top curve: on-axis response
Middle curve: 15 degrees off-axis response
Bottom curve: 30 degrees off-axis response
Sensitivity: 87.5dB
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 @ 95dB, 50Hz - 10kHz (measured @ 2m)
Top curve: frequency response @ 95dB SPL
Bottom curve: THD+N @ 95dB (50Hz - 10kHz)
Chart 4 - Impedance Magnitude Variation and Electrical Phase
Impedance curve
Vertical axis: impedance
Horizontal axis: frequency
Electrical phase
Vertical axis: phase
Horizontal axis: frequency -
Thanks for the link PT. My dad took part in one of the NRC subjective tests back in the day with Dr. Floyd Toole. Apparently they have some of the best testing facilities in the world.
Here is a link on how they test. Interesting stuff IMO.
http://www.soundstagemagazine.com/measurements/test_loudspeakers.htmGraham
