Surround Processor Reviews

Analog frequency response in Pure Direct mode:
–0.14 dB at 10 Hz
–0.04 dB at 20 Hz
–0.01 dB at 20 kHz
–0.05 dB at 50 kHz.

Analog frequency response with signal processing:
–0.84 dB at 10 Hz
–0.25 dB at 20 Hz
–3.29 dB at 20 kHz
–55.14 dB at 50 kHz.

The above chart shows the frequency response of the left (aqua), center (green), LFE (purple), and left surround (red) channels at the preamp outputs of the Dolby Digital decoder. The left channel measures –0.04 decibels at 20 hertz and –2.11 dB at 20 kilohertz. The center channel measures –0.04 dB at 20 Hz and –2.12 dB at 20 kHz, and the left surround channel measures –0.02 dB at 20 Hz and –2.11 dB at 20 kHz. The LFE channel, normalized to the level at 40 Hz, is +0.01 dB at 20 Hz, reaches the upper –3dB point at 118 Hz, and reaches the upper –6dB point at 121 Hz.

Response from the multichannel input to the main output measures –0.13 dB at 10 Hz, –0.04 dB at 20 Hz, –0.01 dB at 20 kHz, and –0.06 dB at 50 kHz. The analog THD+N was less than 0.008% at 1 kHz with a 100-millivolt input and the volume control set to 82.5. Crosstalk with a 100-mV input was –92.21 dB left to right and –93.16 dB right to left. The signal-to-noise ratio with “A” weighting was –130.38 dBrA.—MJP