Surround Processor Reviews

Analog frequency response in Stereo Direct mode:
+0.07 dB at 10 Hz
+0.04 dB at 20 Hz
–0.03 dB at 20 kHz
–0.19 dB at 50 kHz

Analog frequency response with signal processing:
–0.11 dB at 10 Hz
–0.03 dB at 20 Hz
–0.00 dB at 20 kHz
–54.45 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. (Note: Center and left surround traces are concealed by the aqua left-channel trace.) The left channel measures +0.03 decibels at 20 hertz and +0.03 dB at 20 kilohertz. The center channel measures +0.02 dB at 20 Hz and +0.04 dB at 20 kHz, and the left surround channel measures +0.03 dB at 20 Hz and +0.04 dB at 20 kHz. The LFE channel, normalized to the level at 40 Hz, is +0.04 dB at 20 Hz, reaches the upper –3dB point at 117 Hz, and reaches the upper –6dB point at 121 Hz.

There was no multichannel input to measure. The analog THD+N was less than 0.021% at 1 kHz with a 100-millivolt input and the volume control set to 83. Crosstalk with a 100-mV input was –91.55 dB left to right and ––91.39 dB right to left. The signal-to-noise ratio with “A” weighting was –118.63 dBrA. —Mark J. Peterson