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RE: RMAA

I disagree. First of all RMAA is more flexible 🙂 because we have the open source codes for measures, so you can do whatever you want with the programming.
Second - they use 1 kHz tone in the measurements of THD, then you can adjust the level - if you want it different then -3dB below FS, and get the FFT spectrum. Well, there is nothing to argue about, everyone prefer what he likes more.
 
I want to try another section between the reciver and the DACs digital input. I want follow Jim W.s suggestion and use a isolational amp. Also i want get rid of the 74xxx chip.

would this work, or is a single ended inverter with higher ouput impedance ok here?
 

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