You won't get any signal back through an *amplifier* between the ouput (now inpu... | Hacker News

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		detaro on Nov 22, 2016 \| parent \| context \| favorite \| on: Headphones can be hijacked to surreptitiously reco... You won't get any signal back through an amplifier between the ouput (now input) and the headphones, so yes, adding one helps.

qb45 on Nov 23, 2016 [–]

This ought to be true in most HP amps out there but there may be exceptions and possibly (I wonder if anybody ever investigated it?) some parasitic coupling too.

https://news.ycombinator.com/item?id=13014435#13018118

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