Lets see your listening room dimensions.

I moved into a new house 3 years ago and so I "planned" (commandeered) one section of the large "L" shaped basement for the audio system.

The section I now use for the audio system is 16 ft wide x 45 ft long.
- Speakers are 8 ft from the 16 ft wall and about 8 ft apart
- Listening position is 8-9 ft from the speakers
- there is around 29 ft of fairly open space behind the listening position
- Ceiling is around 7.5 feet with a couple of 9 inch dropped sections for ducting etc..
- the room is carpeted throughout

I have just started listening for room specific acoustic anomalies ( I had to get the cables right and speaker placement nailed first) and to be honest, I am finding it really hard to find any room related issues.
- I had many issues at the last house, but that room was 2 x 15 x 8ft high, with a large bow window at one end

There is one section of wall that might need some treatment, but this is the best I have ever heard my system sound.

Performers are nicely situated just behind the speakers and the image envelopes the listening position, melts away the walls and disappears far behind the wall behind the speakers.

The sweet spot is enormous - even listening from locations close to the side walls reveals the position of the artists has changed little compared to when sitting in the dead centre position.

I now have two wing chairs in the "listening position" and there are no longer any comments from my wife about me getting "the Sweet Spot"

Live music now sounds like being at the concert in every respect and if the sound engineer does a good job, then even studio recording sound like a live performance :-)

I consider myself very fortunate, because rooms like this can be a nightmare when trying to resolve problems.

Regards - Steve

20" deep X 25' wide with cathedral ceiling.  A rug in front of the speakers is the only treatment needed.

We bought this home because my wife loved the kitchen and I loved what would become a great space for my stereo.

31 feet long, 18 feet wide and 12 feet high.

The room has slate floor with wool rugs covering about 75%. For several years no treatment other than ASC tube traps in the corners behind the speaker.

Since then I’ve gone full treatment and although the dimensions are on my side, professional acoustical treatments were a huge benefit.

2 rigs. The Quad ESL near field is one corner of 40’x26’x7’6" with beamed ceiling basement. The other system is the corner at the other end but is actually almost half the space at the other end.