KEF R900 Home Theater Speaker System HT Labs Measures

L/R Sensitivity: 90.5 dB from 500 Hz to 2 kHz

Center Sensitivity: 89.5 dB from 500 Hz to 2 kHz

Surround Sensitivity: 88 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the R900 L/R (purple trace), R400b subwoofer (blue trace), R600c center channel (green trace), and R100 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 R900’s listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +0.54/–2.04 decibels from 200 hertz to 10 kilohertz. The –3dB point is at 50 Hz, and the –6dB point is at 40 Hz. Impedance reaches a minimum of 4.54 ohms at 224 Hz and a phase angle of –30.07 degrees at 3.8 kHz.

The R600c’s listening-window response measures +1.04/–2.21 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.24/–2.14 dB from 200 Hz to 10 kHz. The –3dB point is at 53 Hz, and the –6dB point is at 41 Hz. Impedance reaches a minimum of 4.08 ohms at 141 Hz and a phase angle of –36.94 degrees at 4.4 kHz.

The R100’s listening-window response measures +2.05/–3.69 dB from 200 Hz to 10 kHz. The –3dB point is at 59 Hz, and the –6dB point is at 53 Hz. Impedance reaches a minimum of 4.65 ohms at 213 Hz and a phase angle of –57.08 degrees at 111 Hz.

The R400b’s close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 41 Hz and the –6dB point is at 36 Hz. The upper –3dB point is at 116 Hz with the Crossover control set to maximum and the EQ switch set to +6 dB.—MJP

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