Acoustic Sound Treatment

Would two ceiling corner panels help out to further treat my room?

Yes. Undoubtedly...two large corner panels will likely give an audible improvement in bass and lower mid.

so should one put panels behind listening position or behind speakers first?

I'd go for behind the listener for bass trapping first but generally more broadband bass traps is better and you can't ever really do enough in bass trapping...although you can over do it in the mid and treble frequencies if you have way too much surface area of panels =>an acoustically dead room = yuk!

Interesting article. It appears that LEDE enjoyed a very brief craze and is now dead. Interesting that a studio had to remodel because it sounded so bad.

I am often puzzled why most Audiogon virtual rooms have extensive acoustic treatment on the wall behind the speakers and first reflection points and yet most have no treatment at all on the wall behind the listener. Perhaps it is just that on the whole more rooms are small and few are large.

Perhaps visual cues also have a lot to do with sound perception. The logic being that if you can't see the acoustic panels (behind the listener) then they are not effective.

My experience has been that a dead end behind the listener and a bright end around the speakers is able to create a very exciting soundstage which mimicks a live performance. The only caveat is that no side wall should fall within 4 feet or less of a speaker mid/treble driver as it starts to collapse or confuse precise imaging. I would include the floor in this minimum distance too - so speaker stands are essential to get the mid/treble away from the floor.

In small or narrow rooms I would support the idea that first reflection points must be treated with acoustic panels. In a large room I think you can get away without treating first reflection points as long as you have carpet and not tile floor and you obey the 4 foot minimum rule.

Just two cents as always and bearing in mind that I like a live energetic sound and that I have a largish listening room, which means that long reverb times/room modes are my main issues.