Best Acoustically Untreated Room You Have Heard?

Best untreated room was a friend's: 1920's house, cathedral ceilings, picture rails, record shelves on one side wall and a fireplace hearth with full-length plate shelf and built-in cabinets on the other side wall. The area behind one's head in the listening position was open to an archway and dining room. The area behind the speakers was broken up slightly by windows, sills, posts, and curtains.

To avoid getting bass traps and the like, try the Cardas speaker placement formula. It does wonders for mitigating standing waves and nodal bloats or suck-outs. That formula has saved me many hassles and perhaps many dollars in room treatments for bass problems.

http://www.cardas.com/insights/index.html

Go to room setup.

I do not know if this is a re-hash of some other known acoustic formula. Don't care; it works. I think it may be mostly oriented toward cone-n-dome, dynamic speakers. Not sure. It's been a while since I read the whole thing.

It might seem that you have less bass in some frequencies at first. Those could have been bloated before. You will hopefully find that you get a more EVEN bass response and that everything integrates much better with the formula.
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I am not affiliated with Cardas in any way. The only Cardas product I use is a phono interface box to convert DIN to RCA which I bought used from a friend.

Cheers---

Ejlif, You hit the problem nail on its ugly head. The Cardas formula requires the user to place the speakers further out into the room than many people can logistically get away with. Well worth doing, though, if you have the space.

There is always a trade off somewhere in Audio.