[pmiller2]

I know this isn't your central point, but you should know that a speaker can be used as a microphone, and vice versa. Granted, a speaker won't be a very good microphone, but it is possible one could design an exploit that uses this capability to record audio and send the results off to who knows where.

[mirimir]

I doubt that anyone can listen through my old JBLs. Totally analog, back to the preamp input.

[zamadatix]

Assuming the chipset support jack restasking (most don't).

[milkey_mouse]

It's unlikely that a basic Bluetooth speaker would even have an ADC to switch to, not to mention speakers without Chromecast-like streaming capabilities probably only have some tiny real-time operating system.

[jacquesm]

You only need one bit of digital input and oversampling to make for a pretty good ADC.