The Vienna bridges 1 kHz Oscillator has distortion attenuation of at least 60 dB and a balanced and floating output with very low internal resistance.
The 1 kHz oscillator can thereby be used as a central level audio generator, because the level remains constant independent of the number of output feeds.
The 1 kHz oscillator has three outputs; output 1 always sends a signal when the switch OSC-ON is turned on, output 2 sends a signal if, in addition, the switch OUTPUT-ON is operated, and output 3 sends a -60dBu or -9dB/-3dBu adjusted signal.
If the 50 kHz peak were found to be at the 0.1% level, that is, 60 dB below the 25 kHz peak, then it might be due to distortionif the distortion were indeed as high as 0.1%.
After the convolution, the point at 20 kHz was indeed raised to -12 dB relative to the constant spectrum, but points at higher frequencies were at -150 dB, indistinguishable from the computation noise.
The grid-on and grid-off random-incidence responses of the BandK 4135 differ by 3 dB at 30 kHz, 4 dB at 40 kHz, 1½ dB at 50 kHz and presumably by substantial amounts at higher frequencies, where the calibration of one of the curves is not known (that is, not supplied by the manufacturer).
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