| Flutter
You are very lucky to have a high 15 foot ceiling. However, even at that height, it will have flutter echoes between it and the concrete floor. So it needs treatment, as several posters have said, both absorbent and diffusive.
The Space Couplers would be brilliant, however few seem to master that DIY and the commercial product is very expensive. Go for it if you can.
An inexpensive thought- hanging panels of plywood, at angles, could be used to break the flutter, while keeping a woody liveness. Excellent for drums I reckon.
DD
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