Sorry for stating the obvious, but from the message it looks like the problem is the drums themselves, not the sound system. In a building next to mine recently a drums school has been opened. At first they kept a window opened so I came there and told them that I hear them perfectly from my sixth floor. They now try to keep the window shut, but when they open a door it’s still rather annoying. My point is that drums can be abnormally loud. We see now at large concerts that a drummer sits in some kind of aquarium.

I notice in fact that even relatively small speakers usually deliver quite a sufficient sound. Maybe I’m being naive, but I’m a believer that in most cases music doesn’t have to be loud at all.