Standing waves

The first question needing to be answered is the dimensions of the room. Generally, the smaller the room, the worse the standing waves (eigenmodes).

Conversely, I HATE music played and heard outside. My drumset sounds thin, flat, and dead, with no resonance, no low frequency fullness, no sustain. Music reproduction is a different matter, added room resonance, fullness, and sustain (all boom) very undesirable.