Polk LSiM707 Surround Speaker System HT Labs Measures

HT Labs Measures

L/R Sensitivity: 88.5 dB from 500 Hz to 2 kHz

Center Sensitivity: 90 dB from 500 Hz to 2 kHz

Surround Sensitivity: 88.5 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the LSiM707 L/R (purple trace), DSW3000 subwoofer (blue trace), LSiM706c center channel (green trace), and LSiM702 F/X surround (red trace). All passive loudspeakers were measured with grilles at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The LSiM707’s listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.05/–1.73 decibels from 200 hertz to 10 kilohertz. The –3dB point is at 34 Hz, and the –6dB point is at 30 Hz. Impedance reaches a minimum of 3.75 ohms at 66 Hz and a phase angle of –47.96 degrees at 83 Hz.

The LSiM706c’s listening-window response measures +1.80/–2.42 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.98/–2.60 dB from 200 Hz to 10 kHz. The –3dB point is at 55 Hz, and the –6dB point is at 51 Hz. Impedance reaches a minimum of 4.29 ohms at 8.6 kHz and a phase angle of –67.02 degrees at 84 Hz.

The LSiM702 F/X’s listening-window response measures +0.63/–3.60 dB from 200 Hz to 10 kHz. The –3dB point is at 89 Hz, and the –6dB point is at 65 Hz. Impedance reaches a minimum of 4.78 ohms at 6.6 kHz and a phase angle of –20.37 degrees at 3.3 kHz.

The DSW3000’s close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 27 Hz and the –6dB point is at 25 Hz. The upper –3dB point is at 415 Hz using the LFE input and default settings. —MJP

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