Bookshelf Speaker Reviews

• KL-650-THX L/C/R Sensitivity: 92 dB from 500 Hz to 2 kHz

• KL-525-THX 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 KL-650-THX L/C/R (purple trace), KW-120-THX/

KA-1000-THX subwoofer (blue trace), and KL-525-THX surround (red trace). All passive loudspeakers were measured at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The KL-650-THX's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.00/–0.87 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.53/–0.56 dB from 200 Hz to 10 kHz. The –3dB point is at 56 Hz, and the –6dB point is at 49 Hz. Impedance reaches a minimum of 4.15 ohms at 174 Hz and a phase angle of –59.88 degrees at 96 Hz.

The KL-525-THX's three-face averaged response measures +3.79/–2.55 dB from 200 Hz to 10 kHz. The –3dB point is at 101 Hz, and the –6dB point is at 83 Hz. Impedance reaches a minimum of 4.54 ohms at 247 Hz and a phase angle of –59.35 degrees at 123 Hz.

The KW-120-THX/KA-1000-THX's close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 22 Hz and the –6dB point is at 20 Hz. The upper –3dB point is at 111 Hz with the lowpass-crossover control set to maximum.—MJP