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Base theme by DesignModo & ported to Powered by Vanilla by Chris Ireland, modified by the "theFB" team.
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Do you have any problems with it the way it is
Standard advice is some bass traps for the corners
Some diffusion between the speakers would be a good idea
whats on the back wall?
The free option is just run a slow sine wave while you sit in your listening position and check for frequencies that are too loud or too quiet. You'll almost certainly have several in that room. Your ears won't pick up tiny changes but you'll easily hear the big nulls and peaks.
You can try the speakers firing down the length which is usually better but it's also about getting to the best compromise for how you need to use the room. Whenever you change positions re-test to see if there are improvements and make note so you can put them back in the best place.
You'd definitely benefit from bass trapping, but you should be able to get improvements from positioning to start with.
I wouldn't bother spending any more on foam personally, especially in a room this small your main priority is going to be absorbing as much lower frequency as possible while still being able to use the room in a way that suits you.
Typical foam panels hardly do anything for low end but are good at absorbing high end. What you can end up with is the bass frequencies ringing out longer than the higher frequencies which skews your perception of what's going on.
I would buy a canvas print I liked off Amazon and then cram the frame with rockwool
Nil Satis Nisi Optimum
I built some using IKEA Besta (four of the 60 x 60 x 40cm deep ones to go on each side wall, 8 total), covered with IKEA bommul (cheap though if you're using for first reflection points it might not be the best for high frequencies... hard to be worse than bare wall though), filled with Knauf Omnifit slab as that's what I could get cheap from B&Q that seemed about right for the task...
I'm definitely no expert but searched a lot of posts on Gearslutz and made an educated guess... It has proved quite effective at dealing with the biggest null in my room, improving it by about 14db. That was my goal as relative to the rest of everything I just couldn't hear it in a mix where I'm sat.
Here are some photos zoomed in on the problem area. They're taken on different days, I've done my best to recreate the conditions (didn't change mic gain on that channel, took measurements of where to place the mic) and think it's pretty representative.
Before (you can't actually see the null in this photo so I highlighted where it is with the cursor)
After, general improvement in decay time around 50hz and the null is greatly improved. Cursor is in the same spot so you can see how much that frequency improved with the deep traps.
Measure first then do some research, then buy/build. You can follow basic principles but since there's always going to be a compromise you might as well figure what the best you can do with your time, space and budget is before spending money. And even if you do nothing you might learn some problem areas for you to be aware of.
It's very easy to spend money on stuff that won't work for what you want it to as doing anything with deeper frequencies requires some very deep traps. I wish I'd started measuring sooner as it'd have saved me money and time on smaller treatments that just didn't work for my issues.