Why does pulling out main speakers from wall improve sound?

PS, my speakers are deep, about 18". So the drivers are all about 30" from the front wall.

Sound radiates out and around each speaker until it bounces off the nearest hard vertical surface. If you have treated walls, it can be mitigated in the upper octaves. Too close to the front wall, and side walls can cause too much lower octaves.

The room is small, about 13.5x13.9x8.

In my treated room, the speakers are less than a foot from the front wall, and 3 feet from one side, 4 feet from the other side wall.

Because of the treatment, I get a true 3D soundstage if the recording is done well.

About half of my collection is recorded well, or very well.

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