Perreaux 25W Integrated Amplifier SX25i - Manual (Page 23)

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THD+N .....................................................0.002%, @ 1kHZ into 8Ω
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..................20Hz to 20kHz, +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 ) ........................................ 100dB
The ratio of desired signal to noise signals in the output.
Integrated reproduction is susceptible to noise because of the
nature of the environment to reveal every detail. This is why
Perreaux engineers have designed the SX25i to maintain a low
noise floor.
Dynamic Headroom ............................................................. >2.0dB
This indicates the SX25i 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.