@milpai - I don’t know if this will help, but here are details of my current room....
It is much like your own, but with two dropped (sofit) sections and a beam that run cross the room, as opposed to the length of the room as in your case .The room is also "L" shaped, with the longest wall being 42 ft and the area where the audio system resides is 17 ft wide
Both speakers are located 8 ft from the wall, which places them under one of the dropped sections, so there is very little sound behind the speakers and what sound there may be is probably trapped by the dropped section.
In front of the speakers is a beam and then a second dropped ceiling section is located behind the listening position, which I believe is mitigating ceiling level reflections from the wall at the far end behind the listening position.
My speakers are rear ported, but the ports are 2" x 8", so there is very little in the way of pressure waves and the internal bracing is designed to minimize standing waves. Also the room is fully carpeted, so I have no bass related issues either
When I first setup the system in the new room I was amazed that the only "treatments" it required, was to handle side wall reflections, so I believe the dropped sections are acting in a similar manner to the vinyl blind that I had installed in the last room and they prevent/trap ceiling reflections
Initially, I did have a couple of traps in the corners, but even those proved to be unnecessary, so I have removed them also.
Another room where I found the vinyl was particularly helpful was in a friends 12 foot high apartment with hardwood floors, concrete walls and ceilings. Once again the vinyl only had to hang down 18" from the ceiling. The improvements were immediately noticeable.
In a couple of audio stores I frequented, the ceiling are quite high, so they had various traps and dispersion devices hanging close too the ceiling.
I have read corners at the ceiling/wall boundary can be an issue, so installing some sort of crown molding may prove beneficial
Hope that helps - Regards - Steve
.
It is much like your own, but with two dropped (sofit) sections and a beam that run cross the room, as opposed to the length of the room as in your case .The room is also "L" shaped, with the longest wall being 42 ft and the area where the audio system resides is 17 ft wide
Both speakers are located 8 ft from the wall, which places them under one of the dropped sections, so there is very little sound behind the speakers and what sound there may be is probably trapped by the dropped section.
In front of the speakers is a beam and then a second dropped ceiling section is located behind the listening position, which I believe is mitigating ceiling level reflections from the wall at the far end behind the listening position.
My speakers are rear ported, but the ports are 2" x 8", so there is very little in the way of pressure waves and the internal bracing is designed to minimize standing waves. Also the room is fully carpeted, so I have no bass related issues either
When I first setup the system in the new room I was amazed that the only "treatments" it required, was to handle side wall reflections, so I believe the dropped sections are acting in a similar manner to the vinyl blind that I had installed in the last room and they prevent/trap ceiling reflections
Initially, I did have a couple of traps in the corners, but even those proved to be unnecessary, so I have removed them also.
Another room where I found the vinyl was particularly helpful was in a friends 12 foot high apartment with hardwood floors, concrete walls and ceilings. Once again the vinyl only had to hang down 18" from the ceiling. The improvements were immediately noticeable.
In a couple of audio stores I frequented, the ceiling are quite high, so they had various traps and dispersion devices hanging close too the ceiling.
I have read corners at the ceiling/wall boundary can be an issue, so installing some sort of crown molding may prove beneficial
Hope that helps - Regards - Steve
.