Sure, but I understood Stehno to be describing normal, average, rooms, not "a crap room". In a normal sounding room, he is arguing that one does not necessarily "need" audiophile acoustic room treatments. I understand this point of view, as I have removed all accessory treatments from my room and have been to other excellent sounding systems in rooms that also had none of these kinds of treatments applied.
Even in some custom designed rooms with all sorts of treatments, we have a couple of cases here on WBF where owners have decided to listen in the near field to large speaker systems which minimizes the impact of the room because they hear much more of the direct sound of the speakers. This makes me wonder if the custom rooms with their treatments add much to the listening experience.
I am just saying that I have heard good rooms which are considered normal and average, one even much below average, and the sound was excellent without any after-market treatments. So I understand Stehno's position that it is not a necessity. Will it help in some cases to some tastes and preferences, perhaps. I am certainly not arguing against it in all cases, but I think he has a point that it is not mandatory and essential in all rooms.
Peter
Where folks are pursuing a high SQ and they don't want to incorporate acoustic treatments for aesthetic, cost or other reasons they, wittingly or otherwise, usually employ the same physics that a proper acoustic addresses in the set up such as keeping speakers well away from side and rear walls , listening in the nearfield etc. There is nothing wrong with achieving the same result using well targeted treatments . In fact as has been stated over and over they are likely to assist in any room (even if only subtle). The problem arises from products that are not suited to the purpose, bass traps that absorb more than just low bass consequently overdamping the room , diffusers and absorbers that alter the phase or spectra of the reflected sound etc. Not to say commercial products are not well designed , just used incorrectly
Understanding of acoustics and treatments has improved dramatically over the last 20 years but this has not always filtered down to product design , even some acoustic engineers are very old fashioned ( or sometimes just batty ) in their ideas.
It really comes down to keeping first reflections down the a 8- 10ms delay over direct sound from walls or ceiling ( our brain seems happy with the floor - its always been there) and control over bass reverb time ( if present - a lot of domestic construction is very lossy)
Then you control any brightness with broadband absorption ( often lounge furniture and your hairy fat listening buddies) out of the first reflection zones.
In small rooms treatment is a no brainer and with any ceiling below say 3m preventing reflection is the critical zone always reaps benefits.
What I am rambling on about saying is that the physics of sound is in play regardless of the system and it can be dealt with by location of gear or devices but they need to be appropriate and targeted.
On the matter of concert halls vs listening rooms you are dealing with the same issues - sound coming from a part of the space to listeners in another part. Its just a different emphasis on the same elements.
If you are interested in the acoustics of halls, Tapio Lokki from Aavar Alto university has done some amazing studies of why some halls sound better.
best stop rambling
Phil