Most rooms don’t need acoustical treatment.

@jumia For apps that can evaluate room acoustics, your own ears are pretty good. Once you hear a good sounding room it's easier to hear when a room doesn't sound right.

I don’t know that I have enough data to agree or disagree with the assertion of ’most rooms’, but my roughly hexagonal shaped room even with a bed in the room needed one acoustic panel on the 1st reflection point on the left to balance out the sound from the left and right speakers.

Know what, that one acoustic panel transformed my room into one of the best sounding rooms I’ve heard anywhere.

I've got my system set up in our master bedroom with a big queen bed on one side of the room and nightstands on both sides. No, the room is not cluttered at all, but it also doesn't look like a typical listening room with monoblock speakers on the floor and industrial looking audio racks. WAF as well as my own visual acceptance factor were major considerations in the audio furniture that I put into this room.

I added one 2" acoustic panel on the one 1st order reflection in the hexagonal shaped room which balanced out the sound reflection time from the left and right speakers. With that one panel, my room is one of the best sounding rooms I've heard anywhere. The other sound absorbing furniture in the room helps, but doesn't necessarily address specific acoustic problems.