[MrCrowbar]

Originally Posted by DanDan

The Bass Trap corner positions are fine. However I recommend floor to ceiling ones. GIK have TriTraps and RealTraps now have a larger high performance one. DIY is easy enough. See SuperChunks at studiotips - tips on studio design, acoustics, and wiring
The side ones are questionable. Take a look at where your modes will be on this hunecke.de | Room Eigenmodes Calculator
Position your other traps where they matter most. This could be overhead, or at ceiling/wall corners.

DD

I think I'll go DIY traps since you can't get anything commercial in germany and shipping costs for those huge things are high. Still scared by those "rock wool is bad for you" stories though. Thanks for the links, these look very helpful.