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Hello, this is exactly what I was looking for! an Adjustable Gain to fine-tune my Anthem MRX which is 3.2Vrms at the RCA output. From what is commonly done with Purifi modules, you could add Voltage regulators. You can surely take inspiration from a Buffer distributed for free by improving it...

Yes exactly ! :)

Ah! Yes! All right! I understand better what you are trying to explain to me now thanks to the graph! (I didn't know how to read/interpret the graph before.) (I'm an amateur as a reminder) Actually 3.2vrms I couldn't compare with 4.2vrms or 2vrms but I think the feeling/listening will be closer...

Thank you for your opinion. it's strange, I have a friend who also has the MRX540, and who buys a Purifi Audiophonics (https://www.audiosciencereview.com/forum/index.php?threads/audiophonics-hpa-s400et-review-stereo-amplifier.32014/ ) But ... @ 4.2vrms audio volume sound is low but amazing...

Hello, I'm newbies, but for 5Vrms or 5.2Vrms for what is value change ? My PreOut (RCA) Anthem MRX540/740 specifications is 5.2Vrms, Bench Test Results is 5Vrms. (https://www.audioholics.com/av-receiver-reviews/anthem-mrx-740-1140-receivers) Thank You Advance, Vincenzo.