#1- the Tile will kill you, and concrete walls can be even more painful.. Better Look into really doing some drywall or at least cheap hanging and laying carpets on some of those surfaces and see how it will all sound first.. The opening can't hurt too much, might help a bit depending on the actual speakers and the response in that room. Fully sealed is not completly necessary unless you have Sound proff reasons to reall isolate it from other areas and driving people crazy.
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