Hi,
I have recently been thinking about buying new main speakers and/or amplifier, but as I read through reviews and articles I see that many recommend trying to do something about the room acoustics before buying new equipment (which sounds reasonable). The problem is that I have not much knowledge about it and how to figure out what to do to improve on it.
I've read about a method where you have someone moving a mirror along the sidewalls and then you sit in the listening position, and at the points where you can see the front speakers you should put up some material. But I don't know what material to use, or how big it should be..
I have taken some pictures of my room, the dimensions is approximately 5 meters (16ft) wide and 7 meters (23ft) long, and it's basically concrete, with a carpet covering the floor.
This picture is taken a bit to the left of sweetspot:
P4300196.JPG
This one is the stairs down to the basement:
P4300197.JPG
The left wall of the room:
P4300201.JPG
Behind the listening area there's an area of the basement with not so much in it (can't use it due to this stupid pillar

) (And yeah, I need to fix the cables

)
P4300203.JPG
Here is the right wall of the room:
P4300205.JPG
Finally a measurement with Radioshack SPL meter and REW. The curve is smoothed out (1/2 octave setting in REW). I can do some other measurements if needed. I think the area from 15-200 looks badder than it really is due to the scales on the axis

- I can post a graph of this frequency area if needed.
I could also make a sketch of the room with dimensions if needed.
I hope someone can help me with what, if anything, I should do with my room before I go buy new equipment
Thanks in advance.
10khz_1.jpg