Hi Skyfly,
What are the walls that cause the 37 Hz resonance ?
If they are the side and front walls, that's ok, but if they are the left and right walls, then the AVAA should be more effective at cancelling it if it was on the other end of the room, of the left side of the diagram.
And if the walls that are causign this are floor and ceiling (that would mean 5 meters between them !), I think it should be a bit more effective if it was on the ceiling than on the floor.
The idea is to place the AVAA the closest to a wall that is involved (or in any place where the resonance is at its max), while being far from the speakers and far from the listener, so that it absorbs the most possible of unwanted acoustic energy while absorbing the least possible useful acoustic energy.
The device itself is just a sound eater. It is blind to good and evil. It absorbs everything that it sees. Good sound as well as bad sound.