Nice one BobF - I wasn't aware of the CO2 sound focussing phenomenon, but see there is plenty of literature on this..
https://www.researchgate.net/publication/341482003_Sound_beamforming_capability_of_a_CO2_gas-filled_cuboid
I guess the kind of beamforming that Energous/ Wattup is pursuing could be interesting here.. (except with safer acoustic waves rather than power!)
https://www.fiercewireless.com/tech/energous-wattup-wireless-charging-working-at-distances-up-to-3-feet-gets-fcc-approval
..and loving the kids in the back of car applications..!
Nice one BobF - I wasn't aware of the CO2 sound focussing...
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