Most rooms don’t need acoustical treatment.

The lower the frequency the longer the wavelength and so therefore the larger the treatment must be. Low bass waves are 50 ft and more so bass traps are relatively large. I had one in my room, tried it all over the place, it is now hanging from the ceiling where it does a great job absorbing the high volume output from my Delta Unisaw. Yeah my shop has some old discarded acoustic panels too. Would call it a dedicated sawing room but that would be a groaner, it does have quite good acoustics though, for a shop. 

So in my room one was too much. There's more than one way of doing this. Townshend Podiums cleaned up my bass a huge amount, without any of the problems of the bass traps. I'm not the only one to notice this either. So watch out, a lot of people have a knee-jerk reaction that it must be the room. Sometimes they may even be right.

How many of those who set up audio in a cluttered room care about room treatment?
I think room treatment is for those who set up audio in a dedicated room with nothing but components and speakers in the listening room except maybe CD or Vinyl racks.

Are their many speakers built with bass traps? My Gershman Grand Avant Garde sits on top of bass trap. The bass is very tight and clean, and also deep. 

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.

I think if people understood basics of what happens to a sound wave and what reverb means, the accoustical trade profession would collapse.

It aint that complex.  Heres what you need to know.

dont want reflected sound interfering with fist waves from a speaker. They collide and muddy sound.  Solution, buy an absorp panel.

buy a diffuser panel to also improve clarity without deadening all the sound. Why does it work?  It scatters sound better to room. Less collisions. Makes room seem bigger.

there it is, most of what i wished i knew alot earler.

it aint that complex, unless u want it to be.

I think if people understood basics of what happens to a sound wave and what reverb means, the accoustical trade profession would collapse.

It aint that complex. Heres what you need to know.

dont want reflected sound interfering with fist waves from a speaker. They collide and muddy sound. Solution, buy an absorp panel.

The first part is correct the simplification part is too simple and wrong...

It is a precise timing of early and late reflections, that will create the essential wavefront that will produce imaging,and soundstage...The interference from reflected sounds are not a problem and could be a solution if the timing is right....In fact reflection coming from the back can contribute greatly to the listener envelopment (LEV)... Then nothing can be simple before understanding it...I tried myself to figure it out, being ignorant in acoustic, in the last week when designing my "machanical equalizer" i just finish to refine it after a week of fine tuning...

My audio system sound right for the first time really,unbeknownst to me before... I refined my Helmholtz equalizer in listening choral music, orchestra, and very complex instrumental timbre like some harpsichord... But you know that all elements falls into place ONLY when the human voices are distinctly perceived each one in his space with his natural timbre...50 hours of listening experiments to adjust all pieces...Nothing is simple... 😁😊 Human ears are designed by evolution and history to perceive accurately timbre tonal speech in all circonstances...Music come ONLY from this fact save for the rythmic body movement accompanying language...

What is simple is buying a costly acoustic materials or gear....But it is not my way....I prefer peanuts costs....
But we cannot spare the use of a room nor spare the great amount of time for listenings experiments tough....The room may or may not cost peanuts....It is a WAF..... 
😁




«One is an auditory source width (ASW) which is defined as the width of the sound image fused temporally and spatially with a direct sound’s image and the other is listener envelopment (LEV) which is the degree of the fullness of sound images around the listener, excluding the sound image composing ASW.»Internet