How to treat my vocal booth

[Mahony]

Hi,
I do not exactly know if I should put pyramid absorbtion foam on each wall and maybe the ceiling. The booth is like a cube 2m x 2m x 2m.
On the floor I have carpet. I covered two walls with 100mm rockwool and put two times rigid on it. One wall only with rigid. The last wall is concrete and here we have a glas-door and a radiator. The ceiling is concrete too. Is it a good idea to put the foam everywhere but the glas-door and radiator?
Thanks for your help.

Mahony

[knightfly]

All that foam, only 2" thick, and the carpet are going to make your room sound very "boxey".

If you can, space some of the foam off the wall by 2-3" - also, if you are into DIY stuff you might want to build a slat resonator into one corner of the booth to help break up having all three dimensions the same - you will get some serious ringing at around 85, 170 and 256 hZ -

you could design a 3-section slat resonator that would smooth out all three of those frequencies, so the booth would sound a lot better... Steve

[Mahony]

Thanks Steve, the slot resonator is a good Idea. But should I leave the ceiling as it is for some reflections. Because it isn't very high and I don't know if these reflections will destroy the sound.

Mahony

[knightfly]

Generally, no - it's usually better to keep a live floor and dead ceiling, because the mic will be closer to the ceiling and there is too much likelihood of getting early reflections from the source (vocal) off the ceiling. This causes phase cancellations (comb filter effect) which will shift frequency as the vocalist moves (even slightly) - this is very distracting... Steve

[Thatoneguy]

Can you expand on the 3 section slot resonator idea a little more.

[knightfly]

Sure, but it would need to be tailored to your closet - do you have final finished dimensions yet? I know you mentioned lowering the ceiling to get rid of the dogleg part... Steve