To give it a fair shot, assume the driver and microphone are studio quality rather than the kind you’d find on a 1970s telephone handset. I bet it’d work pretty well.
But the real question would then be: how much of an air gap could you create and still get a connection?
Could you post to HN on an ADSL signal that’s being screamed across the length of the room you’re sitting in?
Not sure if this is within the spirit of the question, but: The individual ADSL bands are only 4 kHz wide, so you could modulate 4 or 5 of them down into the audible range (20Hz - 20kHz) and back up again after the transmission through the acoustic coupler. In theory, ADSL should then pick those bands to transmit the data.
To give it a fair shot, assume the driver and microphone are studio quality rather than the kind you’d find on a 1970s telephone handset. I bet it’d work pretty well.
But the real question would then be: how much of an air gap could you create and still get a connection?
Could you post to HN on an ADSL signal that’s being screamed across the length of the room you’re sitting in?