You're playing in a cube which is definitely the worst situation to be in. In my opinion, the best thing you can do is get headphones with a lot of ambient attenuation. Trying to decrease the echo or reverberation times in a room of those measurements is pretty much futile.
How do you get your drums into that room and still be able to move your arms?
This situation reminds me of an office building where I was called in to evaluate the "live sounding" reception area. It was an insurance building built to occupy between five and six hundred people. The designer put more emphasis into the eye candy aspect of its interior than that of a functional aspect. The lobby area was about three stories high and the length and width were very close in volume area to its height, making it a "cube". To top this off, it was of an aquarium (glass) design. If you would walk through the stone floor area when the receptionist was on the phone, she had difficulties hearing the caller. There were also many metal doors that lead to the different spokes of the building. When these doors had their push locks engaged or when the closers on these doors slammed them shut, it sounded like mini explosions happening throughout the entire lobby. You couldn't remain in this area for more than a couple of minutes before severe ear fatigue would set in. What really cracked me up was that you could the rest room toilets flush loudly inside this large glass cubical area. To help rectify the sound situation in this lobby, but not even coming close to entirely eliminating it, it would have more than fully depleted was was left in their construction budget. The business right now is in a "run off" situation, so they won't have to put up with it's poor interior sound design much longer.
BTW, the way they "fixed" this was to move the reception area to another location in the building.
Dennis
