I have a small room, aprox. 16m², and somehow where I used to listen was forming some boomy sound around 80hz.
After some tests, I changed the position of my sofa and I get some rich sound, but every other positions that I put my ears on causes boomy. When I say "every other positions" I mean 30cm above or sideways, in front... It's really weird and I don't know to treat that.
I tried to make tests with some mattress and helped, but of course was just a quick test.
You problably won't understand nothing, but some pictures of my room yesterday on this brazilian forum: https://www.htforum.com/forum/.....st-7969807
August 12, 2013
L, Fill out the information in this link: https://acousticfields.com/fre.....-analysis/