Amentum boost output impedance

[giovanni]

I was doing some circuit analysis on the Amentum, because, you know, work is not enough work, and I came to the conclusion that the Amentum has a relatively high input impedance (~600kohm) and a relatively high output impedance. My calculation came to about 100kohm (with volume maxed out) and a Spice simulation seemed to confirm that. That also means that when the volume is half, the output impedance should decrease to 25kohm (two halves in parallel). Is that correct? Or did I do the math wrong?

 

[giovanni]

I think I did do the math wrong. I forgot to short the input. With that, I get a 10kohm instead, or 2.5kohm when the volume is half.