Lexicon MC-12 Preamp/Processor HT Labs Measures
The above chart shows the frequency response of the left (blue), center (green), LFE (purple), and left-surround (red) channels at the preamp outputs of the Dolby Digital decoder. The left, center, and surround channels are all flat, +0.00/-0.08 decibels from 20 hertz to 20 kilohertz. The LFE channel, normalized to the level at 40 Hz, is -0.00 dB at 20 Hz, reaches the upper -3dB point at 111 Hz, and reaches the upper -6dB point at 118 Hz.
The analog frequency response of the left channel is -0.03 dB at 20 Hz and -0.12 dB at 20 kHz. The response dropped to -0.09 dB at 10 Hz and to -30.80 dB at 50 kHz. The upper -3dB point is at 46.4 kHz. The analog THD+N is less than 0.025% at 1 kHz with a 100-millivolt input and the volume control set to +3. Crosstalk with a 100-mV input was -92.84 dB left to right and -91.57 dB right to left. The signal-to-noise ratio with a 100-mV input from 10 Hz to 24 kHz with "A" weighting was -98.67 dBrA.—AJ