"However I can't for the life of me understand why Boeing thinks we hear with our knees? Why isn't the speaker in the ceiling?"
I could swear the last 12 years on Boings (737s), that the speaker was somewhere above and behind me, with my seat correctly adjusted IAW SOPs pre-departure etc etc.
Couldn't really care where it was, it got my attention when selected for the purpose, but I think headset on BOTH ears is the safest way for audio mixing and hearing protection.
Any flight management who decides to be prescriptive in this needs to get out more, maybe try flying on the line 20/28 days?
RTO says it very capably about this breed of allegedly humanoids, who are doing more damage to the industry which took soooh long to become reasonably safe but thanks to their efforts is going backwards.