An expert advice would be very much needed. Thank you !

[Ivo]

I am just before starting building work for my new (and for this life time final) studio.It will be done by a reconstruction of a big truck garage. The size is 7x5x 3,5 m. It will not be a commercial studio, just a sound alchemy place for me.

Mine is a pure acoustic music (www.savita.cz) and I would love to reach a nice full sound of acoustic instruments (violin, viola, flutes, ethnic instruments, drums etc.) in my new studio. Since I will not have any possibility for a separate control room, the studio will be all in one (I have BW Matrix S3 for monitoring). But this is another topic ..

There will be an outer sound isolation construction done – new walls will be built inside, with about 8cm of acoustic fiberglass in between (the place around is relatively very quiet).
The building work will start within 7-10 days.

Just now, in the last moment, I got an inspiring impulse that once the inner walls will be freshly built, it could be very wise not to build them exactly parallel, from acoustic reasons (to avoid unwelcome sound waves – and to decrease the necessity of putting too many additional acoustic panels later).
And this is the kind of expert advice I would really aprecciate at this very moment:

1) Is the idea of non-paralel walls recommendable for my case ?
2) If yes, in which way and under what exact angles (within the given size) would it be optimal (I suppose some calculation is possible – but I don´t know the method myself) to reach a clean acoustics
a) like on picture 1 – constant angle from beginning to end ?
b) or better breaking in the middle ? (picture 2)
3) the ceiling – should it also be done under certain constant angle (picture 3) or rather like 2b ?
4) Should the front wall be angled too (like on pics 1,2) ? There will be some difussors on the rear wall

The floor will be wooden floating.

The fine adjustment of inner acoustics will be another story. But the above mentioned essential questions are very crucial and urgent for me now.

I would be very happy if you, as more experienced experts, could recommend ideal inner walls propotions for my case, which could help me to reach very nice, full, rich and clean acoustics as the result. This will be a creative place for me for the life time …
(But I am quite non-technical type

Thank you very much in advance for your kind advice !

[knightfly]

Ivo, sorry for the delay; juggling too may "hats" these days for my own good

1) Is the idea of non-paralel walls recommendable for my case ?

Generally, yes. More work, but less treatment needed for flutter and some "evening out" of modes.

2) If yes, in which way and under what exact angles (within the given size) would it be optimal (I suppose some calculation is possible – but I don´t know the method myself) to reach a clean acoustics

At least 6 degrees away from parallel will tame most flutter echo - a bit more wouldn't hurt.

a) like on picture 1 – constant angle from beginning to end ?



b) or better breaking in the middle ? (picture 2)

(a) will give you only ONE acute angle in the room, (b) will give two. Acute angles tend to "focus" sound, so can cause "hot spots" at some locations in the room, making it more difficult to locate good places for mics and instruments.

3) the ceiling – should it also be done under certain constant angle (picture 3) or rather like 2b ?

For a control room, a constant angle UP to the REAR of the room works OK; for best recorded sound, maybe not. For what you're trying to do, I'd consider something different. Either diffusion or "clouds" of rockwool, probably more toward diffusion for acoustic instruments.

4) Should the front wall be angled too (like on pics 1,2) ? There will be some difussors on the rear wall

With diffusors on one wall, angling the opposite wall won't be necessary except for low frequency modes - if you can still choose your room dimensions, this will be less of a problem.

The floor will be wooden floating.

Be careful with this one; can you be more specific about your EXACT plan on the floor, starting with what's already there and explaining your idea layer by layer? Steve

Oh, almost forgot; here is an example of some good ideas for treatment -

http://www.orionsound.com/wall_ceiling.htm

Enjoy -