These debates have me rethinking and rereading.
"Reflection from flat surfaces"
"Like the light/mirror analogy, the reflected wavefronts act as though they originated from a sound image. This image source is located the same distance behind the wall as the real source is in front of the wall. This is the simple case - a single reflecting surface. In a rectagular room, there are six surfaces and the source has an image in all six sending energy back to the receiver. In addition to this, images of the images exist, and so on, resuting in more complex situation. However in computing the total sound intensity at a given receiving point, the contributions of all of these images must be taken into consideration."
Taken from the Master Handbook of Ccoustics. by Alton Everst Pg 193
I hope this is clearer then my explanation
"Reflection from flat surfaces"
"Like the light/mirror analogy, the reflected wavefronts act as though they originated from a sound image. This image source is located the same distance behind the wall as the real source is in front of the wall. This is the simple case - a single reflecting surface. In a rectagular room, there are six surfaces and the source has an image in all six sending energy back to the receiver. In addition to this, images of the images exist, and so on, resuting in more complex situation. However in computing the total sound intensity at a given receiving point, the contributions of all of these images must be taken into consideration."
Taken from the Master Handbook of Ccoustics. by Alton Everst Pg 193
I hope this is clearer then my explanation