Tower Speaker Reviews

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the LSi25 L/R (purple trace), PSW650 subwoofer (blue trace), LSiC center channel (green trace), LSiFX side surround channel (red trace), and LSi9 rear surround channel (gold trace). All passive loudspeakers were measured at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The LSi25's listening-window response (a five-point average of axial and +/-15-degree horizontal and vertical responses) measures +0.82/-2.34 decibels from 200 hertz to 10 kilohertz. The -3dB point is at 27 Hz, and the -6dB point is at 25 Hz. Impedance reaches a minimum of 2.02 ohms at 94 Hz and a phase angle of -43.97 degrees at 2.2 kHz. Sensitivity averages 89 dB from 500 Hz to 2 kHz.

The LSiC's listening-window response measures +1.38/-0.77 dB from 200 Hz to 10 kHz. An average of axial and +/-15-degree horizontal responses measures +1.54/-1.18 dB from 200 Hz to 10 kHz. The -3dB point is at 67 Hz, and the -6dB point is at 55 Hz. Impedance reaches a minimum of 2.36 ohms at 65 Hz and a phase angle of -42.17 degrees at 1.8 kHz. Sensitivity averages 88 dB from 500 Hz to 2 kHz.

The LSiFX's three-face averaged response in dipole mode measures +1.05/-2.49 dB from 200 Hz to 10 kHz. The -3dB point is at 60 Hz, and the -6dB point is at 43 Hz. Impedance reaches a minimum of 2.49 ohms at 46 Hz and a phase angle of -41.05 degrees at 1.8 kHz. Sensitivity averages 86 dB from 500 Hz to 2 kHz.

The LSi9's listening-window response measures +1.10/-2.18 dB from 200 Hz to 10 kHz. The -3dB point is at 59 Hz, and the -6dB point is at 47 Hz. Impedance reaches a minimum of 2.57 ohms at 53 Hz and a phase angle of -21.31 degrees at 1.8 kHz. Sensitivity averages 88.5 dB from 500 Hz to 2 kHz.

The PSW650's close-miked response, normalized to the average level from 40 to 80 Hz, indicates that the lower -3dB point is at 32 Hz and the -6dB point is at 28 Hz. The upper -3dB point is at 136 Hz with the variable low-pass crossover control set to maximum.—AJ