Front call absorption, pls explain theory...

Tboooe, You can successfully deal with sidewall reflections by using a severe degree of toe in, i.e. setting the axis of the speakers to cross in front of your listening chair. If you do that, you can also increase the space between the speakers and your listening position, if room size allows. Something to play with on a rainy day. :-)

Blankets from the moving companies are ugly but work very well.

Tboooe - now you know the science, an alternate solution to pillows - a trip to Winners to purchase a couple of cheap canvas prints.

Then go to a material store and purchase some polyester batting - it's better than fiberglass insulation - less irritating - place this behind the canvas (hold in place with some fishing line) and mount them on the wall - play with placement - it can make a difference.

Another option is to adjust speaker placement from the front wall so that the reflected sound waves are "aligned" with the speaker drivers such that it augments the original signal and not degrade it.

Whilst this is not the ideal solution - i.e. it can create a little bit of an echo depending on room characteristics - it can be more pleasing than having the reflected signal degrade the source signal effecting the spatial imaging.

I opted for the speaker placement solution because of many factors (WAF & furniture) and the front of my speakers are only 39.5" from my front wall - which is not too greater protrusion into the room.

The other issue my room had was a significant echo at the front wall - which I fixed with a pair of 15" x 86" baffles placed in the corners at a 30 degree angle to the side wall. For these made a 1.5" frame with a canvas front and polyester batting.

Just a thought

What's happening is that; when the reflections are close to the original sound source, the timing between the original sound and the reflected sound is too close for the brain to process as separate sounds, so it sounds smeared (not correct). By absorbing some of the early initial reflections your allowing yourself to hear things more clearly.