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This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the SD-43 satellite (purple trace), SD-43 subwoofer (blue trace), and SD-43 center channel (green trace). All passive loudspeakers were measured at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The satellite's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +4.97/–9.23 decibels from 200 hertz to 10 kilohertz. The –3dB point is at 174 Hz, and the –6dB point is at 143 Hz. Impedance reaches a minimum of 5.75 ohms at 468 Hz and a phase angle of –26.31 degrees at 224 Hz. Sensitivity averages 85 dB from 500 Hz to 2 kHz.

The center's listening-window response measures +4.76/–10.72 dB from 200 Hz to 10 kHz. An average of axial and (+/–15-degree) horizontal responses measures +5.06/–10.58 dB from 200 Hz to 10 kHz. The –3dB point is at 154 Hz, and the –6dB point is at 134 Hz. Impedance reaches a minimum of 5.74 ohms at 424 Hz and a phase angle of –22.38 degrees at 224 Hz. Sensitivity averages 85 dB from 500 Hz to 2 kHz.

The sub's close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 55 Hz and the –6dB point is at 45 Hz. The upper –3dB point is at 110 Hz.

The left amplifier channel, with two channels driving 8-ohm loads, reaches 0.2% distortion at 28.6 watts and 1% distortion at 33.6 watts. Into 4 ohms, the amplifier reaches 0.2% distortion at 29.7 watts and 1% distortion at 34.3 watts. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –73.74 dB left to right and –69.31 dB right to left. THD+N from the amplifier was less than 0.071% at 1 kHz when driving 2.83 volts into an 8-ohm load. The signal-to-noise ratio with 2.83 volts driving an 8-ohm load from 10 Hz to 24 kHz with "A" weighting was –83.61 dBrA.—MJP