Sorry for bringing confusion, in fact I ve of course read all the recording manual, it would be a shame not to do so.
I tried to aply this concept for the first reflections :
http://johnlsayers.com/HR/index1.htm
I have a 11° angle... I thought it was enough, in the link above it is a 7° angle. In fact I have several architectural problems that make difficult to built big corner-traps in some corners (door to close to the corner, airing at wrong place, etc), so I'll try as much as possible to deal with that... I was planing to put those curved wooden helmholtz on the first half of the side walls (first reflections place...), and absorbtion at front + rear wall... And also to make as much as possible big superchunks at every corners as advised by Stuart... I ve also planed to make a ceiling cloud on the whole ceiling surface (thanx to Stuart's advice!)... So I can also consider membrane traps on the front and back-wall... Is it better to do : reflective side walls + absorbing front/rear walls ; or kind of half/half on each wall...?:shock: :?: :!: :shock: Why would you want to put REFLECTION at your first reflection points? That's where you need ABSORPTION! You should be reducing all first order reflections as much as possible, not making tings more reflective. You COULD do that if you angle it steeply enough to ensure that all first order reflections are going way past the listening position, but the small angle you are using for that perforated panel does not look like it is enough for that. Did you ray-trace to figure out the angles?