Don't they use MEMS microphones nowadays? (https://en.wikipedia.org/wiki/Microelectromechanical_systems)
Either way, solid advice!
You have audio-video input sensors on all sort of programable devices nowadays, even some TVs can be turned into two way communication devices. That's a nice 1984ish vibe to ruin your late night matrimonial TV browsing.
If brute force isn't working, you're just not using enough of it yet.