Bedroom noob needs help in treatment

Hi all, First of all I'd like to thank everyone on this forum who share useful information about treatments and acoustics and help noobs like me. :) I really need a help to treat my room. Main purpose of the treatment is to get more control over the sound (particularly lows/low-end) during mixing. After reading and studying the forum as the first place I decided to place corner bass traps (superchunks) in all corners of my room from floor to ceiling. It's showed on the sketch. Currently I'm on a half way of finishing building the superchunks. I don't know what to do next. My first thoughts are to build some straight standard traps (2'x4'x4" panels) but I have no idea where to put them. Maybe two behind and two opposite the monitors? Maybe anywhere else? The sketch of the room in the attach. I've tried to show all important details here including sizes and objects. Sorry if it is a bit messy. One important note I'd like to say: unfortunately I'm not able to move or to change anything in the layout of the room since it's a rented apartment. So there is only one spot where the monitors can be placed (it's on the sketch). But I guess I could build and set temporary panels if it's necessary. Some info about room: Size of the actual room - Height: 8.2' - Width: 9.68' - Length: 18.17' As you can see the shape of the room is a bit odd-shaped but the room hasn't non-parallel features. The walls are made of brick, floor and ceiling are made of concrete or kinda. The floor is covered by linoleum, and all walls and ceiling have wallpapers. There is a carpet behind the monitors and one more carpet is on the floor, it covers the most area of the actual room. There are curtains on the window. The doors are made of wood. There are an usual couch, coffee-table and a wood desk. I guess that's it. Also I suppose I can build and set diffusors if it helps to treat my room. Thanks in advance for your suggestions.

welcome! one consideration - extending the wall on the left hand side of the desk about 2' so you can create a more symmetrical layout up front. then treating all the first reflection points, corner absorption etc.

gullfo wrote:

welcome! one consideration - extending the wall on the left hand side of the desk about 2' so you can create a more symmetrical layout up front. then treating all the first reflection points, corner absorption etc.

Hi Glenn, Thanks a lot for your answer. I've changed the sketch according to your suggestions, but I'm not sure what the first reflection points are. Is it a point where a sound wave coming from a speaker meets any surface? Could the points above speaker or behind speaker be considered as the first reflection points? I've added absorbtion panels to the sketch. Are they on the right places? Thanks in advance, Andy

the first reflection points (wall, floor, ceiling) are the point between you and your speakers which have the bulk of the reflections directed to your ears - out of skew with the direct signal and the later arriving signal from the rear of the room. you can use a mirror to find, from your sitting position (you'll need an assistant), where you can see the HF driver on your monitors and center the absorption on that point.

gullfo wrote:

the first reflection points (wall, floor, ceiling) are the point between you and your speakers which have the bulk of the reflections directed to your ears - out of skew with the direct signal and the later arriving signal from the rear of the room. you can use a mirror to find, from your sitting position (you'll need an assistant), where you can see the HF driver on your monitors and center the absorption on that point.

Thanks again, Glenn, for your clear explanation! I really appreciate your help. Cheers, Andy