此外,该扬声器,可设置在两个方面:自由场和近墙。 全套的测量与自由进行了现场安装(灰色电缆和5.3欧姆高音电阻),但是,额外的频率响应测量是用近壁设置(棕色线和4.2欧姆高音电阻)作比较。urthermore, this loudspeaker can be set up in two ways: Free Field and Near Wall. The full suite of measurements were done with the Free Field setup (gray cable and 5.3-ohm tweeter resistor); however, an additional frequency-response measurement was performed with the Near Wall setup (brown cable and 4.2-ohm tweeter resistor) for comparison.vChart 1 - Frequency Response and Sensitivity |
Microphone measuring position: tweeter axis
Grille: off
Sensitivity: 89.5dB (averaged 300Hz-3kHz, 2.83V/1m)
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
Additional Measurement
"Near Wall" configuration
Frequency response, 20Hz - 20kHz (measured @ 2m, plotted @ 1m)
Curve: on-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 - 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
Chart 5 - Impedance Magnitude Variation and Electrical Phase |
Impedance curve
Vertical axis: impedance
Horizontal axis: frequency
Electrical phase
Vertical axis: phase
Horizontal axis: frequency