Suppose you have a door in a corner (along with the floor, we've got three surfaces meeting).
If there was no door, that would have been a very good location for a bass trap.
But if that door is open (I actually had it removed when I moved in the house and don't intend to replace it) is it not the ultimate bass-trap?
Surely any waves that try to accumulate there will be dispersed outside the room and practically none of them will ever come back.
Am I right, or am I missing something major here?
In fact I've also got another corner door in the room, and empirical evidence suggests that extremely loud music is less boomy when it is wide open (it leads to a conservatory, so most of the acoustic energy through there will be gone for good).