Each room has its own properties, which influence its acoustics. Some of them are not significantly affected, e.g. by size or shape, unless at the construction stage. However, some treatments can improve the acoustics of a room. A room with rounded corners and parallel walls is ideal for listening to music.
Parallelism and refraction of walls and ceiling, unfortunately, prevents standing waves. Then these waves accumulate in the corners of the room. Bass traps should be placed in these places. If you adapt a room to listen to music, you don't have too much influence on its shape or layout of the walls. However, a lot can be done by changing the furnishings of the room, setting up the speakers or arranging the appropriate acoustic systems.
So how can I set up columns in a small room? Some areas should be dampened, while others should be left built-up. In a long room, the positioning of columns and furniture is of great importance. In this type of interior you should first of all keep as much distance between the columns and the wall as possible. There should also be a large distance to the walls behind the person listening to music. It is also worth checking if the music sounds better when the shorter walls are suppressed on a shorter surface or only in the corners themselves. Interestingly, it is not only the first impression that should be taken into account. The room is best checked for a few days, listening to music for several hours each day. With this arrangement, longer walls should remain built over a large area, if possible symmetrically. In this case, panels such as acoustic pyramids and diffusers may be helpful.
In order to position the columns in the opposite direction, it is necessary to have a room width of at least 2.5 meters. Otherwise, it is not possible to maintain a sufficient distance. Longer walls, i.e. those placed behind the speakers and behind the listening position should be carefully dampened, e.g. by means of acoustic foam on the whole surface. Thanks to the large distance to the side walls you can leave them slightly less attenuated and decorate only with elements that dissipate the sound.
It is also worth considering a room with a ratio of 3x4 or 4x5. This is a classic room in apartments in blocks of flats. The location of columns, armchair or damping materials is also classic. Such a location is a good starting point for changes in the room. Combining these settings is the best way to achieve a good and satisfying sound while listening to music. While experimenting, it is worth trying to test less typical variants. The effect can be perfect many times, but there are also mistakes. However, a well-known proverb says "Training makes you a master", so all activities will pay off in the future when you arrange another room.
In a room that has an L-shaped shape, it is unfortunately difficult to say with certainty whether it will have a good or bad effect on the overall acoustics. The dimensions of the recesses and their proportions can really be diametrically different. The safest solution, however, seems to be to position the listening chair backwards to a given niche. The recess should be suppressed and covered with an additional curtain. Apart from that, in such rooms it is necessary to experiment and combine. This is because many times theory does not translate into practice. The key to success is therefore simply a trial and error method.