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Speaking of poor communication, have you ever heard a sound system or paging system that was painfully loud, but every message delivered was "uaaa uaaa ua uaa uaaa uaaa"?
Here's what happened: The low-bidding sound company put in equipment that made noise but wasn't capable of transmitting the actual nouns and consonants of actual speech. This isn't an uncommon situation: Anyone can hook up speakers but not everyone can make a system that transmits accurate sound. It's like driving or sex. Everyone thinks that they can do it well, but not everyone can.
So the subliterate people on the floor complained that they couldn't "hear" the announcements, and the subliterate manager just turned it up more. And they still couldn't "hear" what the person at the microphone was saying, so the poor dimwit turned it up more. So now you have bursts of sound so loud that they rupture eardrums, cause concussions, and blow up pacemakers, and still nobody can make out what the announcements are.
If people were a little more articulate, they'd report to the manager that they can hear the announcements but they can't decipher them. Of course the manager is oblivious, and he'll interpret that report as saying that you don't know what "Security to the magazine rack!" means.
I don't know how the world even functions.
If you ever want to get depressed, call a few companies that provide office phone systems, and ask them which system has the best-sounding music on hold and the best voice quality, or at least the least bad. They won't know what you mean even if you try to explain it to them.
Sound is important.
You can enjoy streaming entertainment with audio but no video (it's called radio), but video without any sound would become boring very quickly.