http://www.ethanwiner.com/acoustics.html

I read this article and i decided to "tune" my room.I have pretty good audio gear and it would be much more useful if i did the acustic treatment.

I have pics cause my primary language is not english so it will make it easyer.
Heres my room description and i hope its ok to use meters as a measuring unit:
room:4x3=12square meters (yep small it is)
ceiling:3m (higher than usual), ceiling is made of wood and gypsum (old building)
Floor is made of stone, front and back and right wall are made of fat concrete and the right wall is made of thin wall (it wasnt there before) called "knauf".Im describing it from my listening position (chair).

The wardrobe is very high (2.5m) and the desk is about the same height as my table.
The door is on the right side (unusually narrow, made of wood) and theres a huge window on the left side of the picture.
My question is how da heck am i going to put a bass trap in the corner where the doors are?
Do you recommend anything else than bass trap cause i notice uneven bass and midrange ringing now. Ou i dont have my room redecorated yet, it still looks like this now:

And i also dont have a sub yet.
My gear:Dynaudio BM6A, Presonus CS, NAD C542 and im going to buy SVS PC+20-39 which is a real monster even at 20Hz so i need bass traps that reproduce that low in my small room.

Question:are these bass traps worth buying:
http://audiopro.octostream.com/App/?m1=7&m2=92

I hope i wont need any foam for midrange and HF when i redecorate my room.

What do you think?

Hard to tell. I don't see any specs on size nor on absorbtion coefficients. Probably better than nothing - just a matter of if you could DIY better for less (most likely).

Ok, though im not a DIY guy really
The triangle shape, that wont give me any gain at 20-30Hz.

Theres one thing i dont understand in the article.When creating reflection free zone, do you need to place mirrors only on one sidewall or on both?

So what do you guys think about placing bass trap on the door (if you look at the first picture)?

Ill post some pics from my room soon...

Doing one corner is better than nothing - but honestly - that room needs a LOT more. Consider the horizontal corners where the walls and ceiling meet.

As for reflections, you need to look at ALL of the walls AND the ceiling.

"As for reflections, you need to look at ALL of the walls AND the ceiling."

Yes ill sure do the celling since its pretty high.
But what i had in mind was a mirror which is placed only on one side i gues.

And i must find a way to put a bass trap on those doors.