Where to place these acoustic foam panels?

[steffeeH]

I got some acoustic foam panels from a friend who didn't have any place for them anymore, and I figured I'd ask you guys where it would be the best to place them.
Note that while I do some music production and audio editing etc, I do it just as a hobby, so I'm not THAT serious on treating the room, I just want to make sure that the panels end up at spots where they do matter and improve the room sound at least a tad, now that I got some panels for free.
These are also some pretty cheap panels that have some wear and tear, so to be clear - this will be a pretty ghetto solution

I received the following panels:
- 4x 100x50cm
- 2x 63x50cm
- 2x 38x37cm

I made a quick sketch of my room - please forgive my poor drawing skills.



The room is a bit different as it has a sloped roof on both sides, with a 1m wide flat roof in the middle. I know the speakers placement is pretty off, but it's just my bedroom.

Note that I'm a complete noob when it comes to room treatment.

EDIT: In case image doesn't work - https://www.dropbox.com/s/0nfeab1asuuhq38/001.jpg?dl=0

[Hink]

for starters http://www.primacoustic.com/acoustic-pa ... ror-trick/

[funky lime]

Nice trick but it doesn't work if you use Vampire Wire cables

[steffeeH]

Thanks for the tip!
Though the guide seems to be more aimed towards scenarios where the sound from the speaker will probably bounce on the wall before reaching the listener, but what about when you sit right in front of a pair of studio monitors by the computer, i.e most of the reflections happen behind the listener?

[funky lime]

The sound is always bouncing. So you're hearing it, then it's bouncing, and you're hearing it again, all at the speed of sound. This affects your perception of the sound, because you might think you're only hearing what the speakers are putting out, but you're hearing all the bounces at roughly the same time. Essentially, your room is a speaker cabinet itself. So certain frequencies can get cancelled or reinforced by the bounces.

But I'm probably butchering that explanation. So here's some light reading on the subject from an actual expert.

[steffeeH]

The sound is always bouncing. So you're hearing it, then it's bouncing, and you're hearing it again, all at the speed of sound. This affects your perception of the sound, because you might think you're only hearing what the speakers are putting out, but you're hearing all the bounces at roughly the same time. Essentially, your room is a speaker cabinet itself. So certain frequencies can get cancelled or reinforced by the bounces.

I understand that, I'm more referring to that the method posted above seem to be intended to stop the most obvious and immediate reflection when the listener and the speakers are on the opposite sides of the room to eachother, but that that specific mirror concept doesn't seem to fit a case where you sit 30-50cm from the speakers with most of the room behind you, hence there must be methods of finding the most obvious reflection spots that are more suitable for my setup

[funky lime]

I will refer you again to the website I already linked in my post above. Specifically, Part 2: Room Design and Layout, where he goes into the mathematics of room modes.

Or try this article for the basics, without getting too scientific.

My point was, the reflections are still as important, whether you're 30cm or 30m from the speakers.

[Aloysius]

On a chair. Then sit on them. Very comfortable.