New audio room - shape

[Karister]

Yeah, thats why I was looking for an acoustic specialist to advise on room proportions. The roof will be wooden and there will be one big window and some smaller ones on the roof. Actually, I visited a few listening rooms in local audio stores with acoustic treatment. They all were build of concrete and sounded good to me. To give you some background - it is possible to build a wooden house here in Poland, similar to ones in the USA or Canada but there are not many developers specializing here in this kind of houses, and there is a high chance that they will screw this up. My colleague lives in such a house and it is a permanent construction site due to rotting wood that wasn't properly impregnated. Too much risk. Concrete or similar constructions are much more popular here.

 

[Eetu]

What you could do is build a partition wall (filled with porous absorptive material like rockwool) at approx. 1/4 room length/width (~1.5 metres). That's roughly where your standing wave null is and since minimum pressure=maximum velocity, placing absorption there would be very effective. See 34:30->

 

[FeddyLost]

is build a partition wall (filled with porous absorptive material like rockwool) at approx. 1/4 room length/width (~1.5 metres)

So, your idea is to make room from 6x5,7 m (34 sq.m) into 4,5x4,3 m (19,3 sq.m) or to lose around 43% of architectural room.
I'd call this too expensive.
Most probably "flexible" plasterboard walls and speakers' placement optimization will be enough if roof is light and soft.

 

[Eetu]

So, your idea is to make room from 6x5,7 m (34 sq.m) into 4,5x4,3 m (19,3 sq.m) or to lose around 43% of architectural room.
I'd call this too expensive.
Most probably "flexible" plasterboard walls and speakers' placement optimization will be enough if roof is light and soft.

I meant only one dimension (leaving for example 5,7x4,5). The 'wall' could be with an opening, you would still be able to use the space. The key thing is to have absorption at that null location.

 

[FeddyLost]

The 'wall' could be with an opening, you would still be able to use the space.

Kind of "rockwool zoning"? Framed wall with door, filled with thick fiberglass plates?
I'm not sure that such solution is universal, but it will work in case of extra long rooms. This room is almost square, and such "chamber" will need some thought about application. To avoid fiberglass, it can be done from some kind of Heradesign with polyesther mattes inside.
As an raw idea it sounds great if one have a lot of free space.

 

[Karister]

I received advice from the acoustic engineer. I will need make the room a bit longer - 6.6m while keeping 5.72m in width and 2.7m in top height. The lowest point, where the roof starts will be 1.7m He claims that most resonances will be possible to fix with proper treatment. There will be a significant dip in ~40Hz bass. To fix it I can either make the room narrower by about 1m or by getting dual subs standing behind main speakers.