Perreaux Headphone Amplifier Silhouette SXH2 - Manual (Page 23)

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THD+N .................................................. 0.001%, @ 1kHZ into 64Ω
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 low-noise
input circuitry and Class A signal stages, Perreaux engineers
have kept this figure to a minimum.
Frequency Response.................... 5Hz to 60kHz, +0dB -0.25dB
Describes the frequency range where the amplitude or strength of
the output signal deviates by no more than 0.25dB.
Signal to Noise Ratio ( unweighted ) ........................................ 105dB
The ratio of desired signal to noise signals in the output.
Headphone reproduction is susceptible to noise because of the
nature of the environment to reveal every detail. This is why
Perreaux engineers have designed the SXH2 to maintain a low
noise floor.
Dynamic Headroom ............................................................. >3.0dB
This indicates the SXH2 can provide more than enough extra
power to cope with the sharpest musical transients. Without
adequate headroom, an amplifier can become unstable under
clipping conditions. Perreaux amplifiers are intrinsically stable
under all dynamic conditions.