>>Would there be any sonic issue with them not being on a wall? Or, to ask it a different way, would there be any issue with there not being a hard surface behind the speaker set-up for sounds to reflect off of?

For reasons I don't... um... remember... bookshelf speakers often sound better when they are pulled way out into the room away from the back wall. You lose some sound reinforcement from the back wall so may need to set the levels up a couple of dB but you'll need to do level setting anyways.

I think this would work quite well.


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