From: (Anonymous)
FWIW, the paper does point out:

Active Loudspeakers vs. Passive Loudspeakers
Note, however, that the reversibility principle poses a limitation: the speaker must be passive (unpowered), without amplifier transitions. In the case of an active (self-powered) speaker, there is an amplifier between the jack and the speaker, hence the signal won't be passed from the output to the input side [6]. Since most modern loudspeakers have an internal amplifier [7], the threat presented in this paper is primarily relevant to headphones and earphones, and not to the loudspeakers typically connected to a PC.


So... laptop speakers may be less of a threat than your earpods. Still... (Makes me glad my headphones are active-amplified Bose w/ no passthrough.)
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Matthew Garrett

About Matthew

Power management, mobile and firmware developer on Linux. Security developer at Google. Ex-biologist. @mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer.

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