33
Gain Resolution...........................................................................................1.5dB
This is the change in gain between each successive volume settin
g (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
m
ade up of frequencies added due to harmonics of the fundamental frequency
and noise. By using a truly balanced circuit topology throughout the SM6 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 unif
orm 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 SM6 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 SM6 provides the foundation for high noise rejection.
This figure is referenced to the rated output of the SM6, 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 SM6 provides mo
re
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 compon
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.