Tower Speaker Reviews

L/R Sensitivity: 87.5 dB from 500 Hz to 2 kHz

Center Sensitivity: 90.5 dB from 500 Hz to 2 kHz

Surround Sensitivity: 85 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the D7 L/R (purple trace), Basis 300 subwoofer (blue trace), LCR7 center channel (green trace), and SR7 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 D7's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.59/–2.58 decibels from 200 hertz to 10 kilohertz. The –3-dB point is at 41 Hz, and the –6-dB point is at 33 Hz. Impedance reaches a minimum of 3.69 ohms at 3.0 kHz and a phase angle of –42.43 degrees at 74 Hz.

The LCR7's listening-window response measures +1.59/–2.02 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.31/–1.95 dB from 200 Hz to 10 kHz. The –3-dB point is at 90 Hz, and the –6-dB point is at 73 Hz. Impedance reaches a minimum of 4.22 ohms at 208 Hz and a phase angle of –35.11 degrees at 2.1 kHz.

The SR7's three-face averaged response in diffuse mode measures +2.47/–4.63 dB from 200 Hz to 10 kHz. The –3-dB point is at 86 Hz, and the –6-dB point is at 74 Hz. Impedance reaches a minimum of 3.71 ohms at 284 Hz and a phase angle of –59.11 degrees at 96 Hz.

The Basis 300's close-miked response, normalized to the level at 80 Hz, indicates that the lower –3-dB point is at 51 Hz and the –6-dB point is at 32 Hz. The upper –3-dB point is at 356 Hz using the sub input.—MJP