Lets see your listening room dimensions.

Way too small. Something like 12 x 14

Dedicated room, 15.5 x 26 (ft).

24 x 14 x 8. Our little split level house, built in 1951, is 'saved' by this room which is divided into Stereo Music at One End; 5.1 Video at the Other End (the listening/viewing chairs spin around as needed.

https://systems.audiogon.com/systems/9511

Mine is a dual purpose music and audio room.  the dimensions are 20.4 feet long 13.4 feet wide with 8 foot ceilings.  Speakers are approximately 8 feet apart and 4 feet from the front wall.  Listening position is 10 feet away with 7 feet on the back wall.  A few treatments have helped such as bass traps, diffusors, HFT's and Townshend podiums for the speakers as well as component isolation.  

As far as dimensions go it is best to avoid multiples, especially the same each way. 12x13 is very nearly square. This room will have the same big bass modes L/R as F/R. The other room 10x20 is twice as long as wide which is less bad and also the extra length opens up some options. You could for example build a wall across one end shifting it to something like 10x17 cleverly using the space as both storage (component, records, etc) with the space behind as a bass trap. Mike Lavigne does something like this in his room. A guy could do worse.  

Doing it this way the width is 17. Put the speakers on that wall, about 2 feet in and you sit a foot or two from the back wall. This gives you real wide space off to the side for awesome imaging and puts you about 7ft from the speakers for a nearfield experience that will require a lot less power. Especially since sitting near the back wall will give a lot of natural bass reinforcement.

Try the 12' x 13.5' one. My room is fairly close to that one, dimensionally, and I've managed to achieve a very balanced, natural sound.

I happened along this thread and am looking for advice.  My system is currently in a very large room 25' x 35' with 8.5' tall ceilings and it sounds awful.  Why, because my house is a mid-century modern built in 1959, and has solid brick interior walls.  Additionally, the right side corner and wall is mostly glass.  The back of the room is open but also has a glass divider.  Lastly, someone installed a large skylight that is over the left speaker.  Since this is the main room we live in and you see when you enter the home, treatments are not an option.  So, I have decided to look at other spaces in my home.  The first is my office that is 10 1/4' x 20 3/4' long, the next room is 12' x 13.5', both with 8.5' ceilings.  The office would be ideal but I don't know if the dimensions will work.  I can put as many sound treatments up to compensate but am concerned the 10' width may be limiting.  Very curious to the groups thoughts.  Thank you in advance.

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.

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.

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

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

blueranger, thanks for your nice comments. I've recently acquired an SET 845 amp, and had all the capacitors upgraded, and despite being Chinese in origin, it drives my custom Tannoy HPD's extremely well. It's the best my room and system has ever sounded.

Happy I am.

Dan

My room is now 35.5 X 20 X 8.  I'm trying to get some room treatments in there besides the new wall to wall rug we just installed 2 months ago because of 8 inches of water because of power failure for 12 hours. Had to install an all home generator so my funds have been depleted but room treatments are coming soon.
   I would love to have my room tested for frequencies but lack the knowledge to do so.Anybody located near Wauconda Illinois 60084 care to do some measurements? I just don't want to throw up acoustic panels willy nilly. Have contacted GIK but $5700 shipped with what they suggested is out of my reach at this time. I don't want to do DIY as my building skills suck.

I've got all of you beat, dimension-wise  ... 10' x 9' x 8'. Fortunately, room treatments from GIK have turned a once awful sounding room into a very nice sounding one.

Like everyone's comments. Thats one heck of a sonic room Dan!

12’4"x14’6"x8’2" height. Stereo is situated along the longer wall. A 2’x5’ louvered, wooden-door closet sits on the stereo’s right flank, shortening the stereo wall by 2 feet.. Speaker placement ignores the existence of the closet, thus making it seem as if the speakers are not centered within the room.  No acoustic treatments other than a trio of racks stuffed with LPs. Wood floor. No cottage cheese ceiling. No rug.

Brand new house. I had the architect and contractor make sure the walls and floor have sound-deadening insulation and that the door is a solid one. I auditioned the stereo along every wall before I declared the job done. And I gotta say, too, that I just love the way it all sounds.

My listening (living room) is 16'.5" X 34' with cathedral ceiling. The long dimension includes the dining room & kitchen. Wall to wall carpeting up to the kitchen, two couches, and my listening chair plopped down about 8 feet from the speakers, which are 6 feet into the room, and are toed-in to the listening position.

I use no room treatments, nor do I need any. I consider it to be the best room I've been in for music listening, and I've been here for twenty five years. I had to move my woodstove to a different wall, so my speakers could fire down the long dimension of my room. I'm very grateful for the privilege of having such a fine listening room.

Regards,
Dan

Im getting out the tape measure asap will let you know.

Mine is more compromised than yours: 20 x 12.5 x 7 ft.

I agree, a bigger room is worth more than tens of thousands in gear. A high ceiling makes a huge difference!

After I put a lot of care into treatment and positioning, the sound in my room is quite enjoyable. Occasionally, though, I think of the house we didn't buy -- audio room 28 x 18 x 8 and a city-lights view. I feel better when I remember, it was by a noisy road.