For the same reason you don’t have a head phone speaker setup on the table to listen from the couch. You have to move a lot of air back and forth for the waves to reach your ears from far away since a lot of it gets wasted over the rest of the room where your ears aren’t. Then when you want to move that much air is hard to do for the lower frequencies with a very small area moving back and forth without a lot of distortion.
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