Boston Acoustics M25 Speaker System HT Labs Measures

HT Labs Measures

L/R Sensitivity: 86.5 dB from 500 Hz to 2 kHz

Center Sensitivity: 87 dB from 500 Hz to 2 kHz

Surround Sensitivity: 85.5 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the M25 L/R (purple trace), MCenter (green trace), MSurround (red trace), and MSubwoofer (blue 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 M25’s listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.16/–3.15 decibels from 200 hertz to 10 kilohertz. The –3-dB point is at 61 Hz, and the –6-dB point is at 50 Hz. Impedance reaches a minimum of 4.61 ohms at 218 Hz and a phase angle of –66.86 degrees at 98 Hz.

The MCenter’s listening-window response measures +2.36/–7.13 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +2.39/–6.92 dB from 200 Hz to 10 kHz. The –3-dB point is at 70 Hz, and the –6dB point is at 63 Hz. Impedance reaches a minimum of 6.12 ohms at 183 Hz and a phase angle of –69.19 degrees at 108 Hz.

The MSurround’s listening-window response measures +1.10/–7.73 dB from 200 Hz to 10 kHz. The –3-dB point is at 111 Hz, and the –6-dB point is at 83 Hz. Impedance reaches a minimum of 4.42 ohms at 232 Hz and a phase angle of –44.44 degrees at 158 Hz.

The MSubwoofer’s close-miked response, normalized to the level at 80 Hz, indicates that the lower –3-dB point is at 26 Hz and the –6-dB point is at 23 Hz. The upper –3-dB point is at 112 Hz using the LFE input.—MJP

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