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Pics of 20Hz, 1KHz, 20KHz amplifier signal. Why is the signal shape different?

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olegau:
 
--- Quote from: Zero999 on January 13, 2025, 12:42:43 pm ---
What's the setting on the bass control? Does setting it to the maximum help?

--- End quote ---
All tone controls are flat position.

Zero999:
I've simulated an amplifier with a low cut-off of 16Hz (due to C1 and R1) a gain of 10 (Avol=10) and an upper cut-off of 30kHz (GBW = F*G = 30k*10= 300k). The slew-rate is 10MV/s which should be fast enough, not to affect the result.

Schematic.

20Hz

1kHz

20kHz


Conclusion: the plots look similar to your oscillograph, so the channel you're measuring is working properly.

The .asc LTSpice file with the frequency set to 1kHz.

Greybeard:
Perfect match!  :-+

fc=1/(2*pi*R*C)=1/(2*3.14*100k*100E-9)=15.9Hz

Your Amp ist specified 15 Hz - 50 kHz /-3dB ( https://audio-database.com/YAMAHA/amp/ca-700.html ).

olegau:
Thanks! I can sleep well:)

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