That might be something I should consider Mika
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What are you planning to do about the glass doors? They look to be a hard reflective surface. Some heavy curtains perhaps?
I have successfully used products from Hofa and Vicoustic plus some Finnish brands for
panels like these..
https://www.ecophon.com/en/products/...ilings/master/
https://www.netrauta.fi/seinapaneeli...xoCg1gQAvD_BwE
Just ne careful One person here on Finland just recently built a new wall from proper materials behind the speakers and the system. This was very effective by measured performance. However he reported that it made room too damp taking the life away from music. So by trial and error he added some diffusers to the wall in critical places to overcome this issue. I might prefer little livelier room and more of diffusing instead of direct damping..
The most critical acoustic interface I found is the first reflection points. Unless you have massive bass issues and room nodes I would leave this alone. Obviously size of speaker and size of room has huge implications.
First reflection points are easy and cheap too sort out and I would definitely use absorption panels here rather than diffuser.
Personally I agree with Mika in that I prefer a slightly liver room than an over damped room. If you don't use Room EQW or any DSP etc the easiest way to asses is a few hand claps. The end of the room where my system is is fairly damped. Heavy furniture and heavy curtains with first reflection point panels. Towards the back of the room it is more lively but good to try and stop reflection point behind your head and listening position as this will smear the stereo image.
Good to factor all these points in when construction a listening room as it can have significant implications further down the road once you get your system set up and choose listening position.
Indeed.
I might add some damped panel wall to the end of the room behind the speakers plus some diffusers. Then some absorption panels to the first reflection points of the side walls and possibly also the ceiling. Then the rest by heavy carpet, curtains and furniture. This should give the room and the system fairly safe starting point for building any system (perhaps excluding the dipole speakers).