Since you need bluetooth, I assume you aren't playing broadcast over the air music from a radio station in your store. That will get you in trouble with ASCAP. Our shop ended up being fined $10,000 for playing the local album rock station. But that was back in the early 90's. Maybe with the current admin they don't give a whatever.
Anyway, if the sound is good out of the box, then just plug in a bluetooth audio adapter and run off of that, bypassing the bluetooth built-in to the box. I have
an Amazon Basics model that works fine.
Edit: I see that the box is dead. Then the same applies. Run the bluetooth audio adapter connected to any sound producing electronic and speakers. An old receiver plus some analog speakers.
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