The Frequency Response has between 10 Hz and 90 kHz only 0,3 dB Tolerance
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Interfering Signal Spectrum related to 10 V / 1 kHz Output Level:
The FFT-Analyse recorded an extrem spectral purity from Output signals. Disturbances from mains (normaly 50 and 100 Hz) are missing
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Harmonic Distortion between 30 Hz and 20 kHz:
The behavior of the harmonical Distortion show a linear curve with a slow rise on low frequencies. This is only possible with high spezialized Output transformers.