Perreaux SM6 MKII - Manual (Page 33)

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Gain Resolution...........................................................................................1.5dB
This is the change in gain between each successive volume setting (i.e. ‘46’ is
-1.5dB, ’47’ is 0dB, ‘48’ is +1.5dB). The gain resolution is linear throughout
the entire gain range.
Total Harmonic Distortion (THD+N) .......................... <0.004%, 20Hz to 20kHz
Total Harmonic Distortion + Noise is the percentage of output signal which is
made up of frequencies added due to harmonics of the fundamental frequency
and noise. By using a truly balanced circuit topology throughout the SM 6 and
maintaining Class A operation at all stages, Perreaux engineers have kept this
figure to a minimum.
Frequency Response .......................................20Hz to 20kHz, +0dB –0.03dB
This is the “standard” specification with which everyone is familiar. Actually,
“frequency response” is a misnomer: technically, it should be called “amplitude
response versus frequency” for it describes how uniform the amplitude or
strength of signals of various frequencies is maintained. It is generally thought
that a difference of 1dB is the least that can be perceived by ear, the SM 6 is
specified almost seven times higher, thus exceeding the audible range of the
human ear.
Signal to Noise Ratio (unweighted) .............................................................. 100dB
The ratio of desired signal to noise signals present in the output. The balanced
circuit topology of the SM 6 provides the foundation for high noise rejection.
This figure is referenced to the rated output of the SM 6, taking into full account
all potentially annoying hum components.
Dynamic Range ......................................................................................... 116dB
Dynamic Range is the difference between the loudest and quietest portions of a
signal. Due to CD formats 96dB dynamic range limit, the SM 6 provides more
than enough dynamic range to cope with any musical transients the CD format
can throw at it.
Channel Separation .................................................................... 105dB @ 1kHz
Channel separation indicates the immunity to crosstalk. Crosstalk is caused by
stray inductances and capacitances between components and lines, which results
in unintentional mixing of stereo signals. M eticulous wire routing ensures
excellent high-frequency separation while superior power supply design
maintains low-frequency separation.
Input Impedance..........................................................................................10kΩ
The resistance “load” that is presented to the component that is driving it. The
high value indicates that the preamplifier will not load down the output of most
high quality source components.