Not treated my room yet but i am very sure the best thing is to find out where exactly the problem areas lie first of all:
"If I were to do it I'd first measure the room using a MLSSA system and a measuring mic. I'd be looking at the waterfall plot to see where the problems lay in both the frequency and time domains.
I'd be looking at the overall and spot RT60 levels.
Then I'd start to think about what treatment mught be necessary. "
...from a thread that stuck to my mind...
Measurement mic - 38 Euros:
http://www.thomann.de/gb/the_tbone_mm1.htm
Room Tools Software - free:
http://www.room-tools.com/index.php?id=7
=========Additional stuff that might be of interest==========
one link from about 20 mill about diy bass-traps:
http://www.radford.edu/~shelm/acoustics/bass-traps.html
a firm from the UK for readily built stuff/foam, no idea how they are rated):
http://www.customaudiodesigns.co.uk/basstraps.htm
free test cd:
http://realtraps.com/test-cd.htm
this sounds well useful as well (forum):
http://www.musicplayer.com/cgi-bin/u...=0;DaysPrune=0
a tutorial:
http://www.samplecraze.com/tutorial.php?xTutorialID=28
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...errr and always put the measurement mic up where your head would be whilst listening, at least i think thats something to consider...