Bookshelf Speaker Reviews

L/R Sensitivity: 88 dB from 500 Hz to 2 kHz

Center Sensitivity: 91 dB from 500 Hz to 2 kHz

Surround Sensitivity: 90 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the RP-150M L/R (purple trace), R-110SW subwoofer (blue trace), RP-250C center channel (green trace), and RP-250S 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 RP-150M’s listening-window response (a five-point average of axial and ±15° horizontal and vertical responses) measures +2.85/–0.85 dB from 200 Hz to 10 kHz. The –3-dB point is at 66 Hz, and the –6-dB point is at 57 Hz. Impedance reaches a minimum of 4.10 ohms at 205 Hz and a phase angle of –50.86° at 111 Hz.

The RP-250C’s listening-window response measures +4.25/–1.62 dB from 200 Hz to 10 kHz. An average of axial and ±15° horizontal responses measures +4.21/–1.78 dB from 200 Hz to 10 kHz. The –3-dB point is at 86 Hz, and the –6-dB point is at 72 Hz. Impedance reaches a minimum of 4.01 ohms at 218 Hz and a phase angle of –37.21° at 129 Hz.

The RP-250S’s three-face averaged response measures +4.46/–3.36 dB from 200 Hz to 10 kHz. The –3-dB point is at 106 Hz, and the –6-dB point is at 90 Hz. Impedance reaches a minimum of 3.98 ohms at 218 Hz and a phase angle of –51.81° at 120 Hz.

The R-110SW’s close-miked response, normalized to the level at 80 Hz, indicates that the lower –3-dB point is at 29 Hz and the –6-dB point is at 26 Hz. The upper –3-dB point is at 130 Hz with the Low-Pass control set to maximum.—MJP