vocal booth acoustic treatment

:? I am currently underway constructing a home studio. I have a question about where it would be best to put acoustic treatment in my small vocal booth. The 4 and 6.5 foot walls are actually 10" concrete walls and are very reflective. I plan on furring out about 2 inches and hanging sheetrock, but I am sure this will not fix the entire problem. I want to use a combination of high freq and mid/low freq treatment but don't know where the best postitioning would be. Also, since it is a vocal booth should the ceiling be treated as well? Please forgive my poor drafting skills.

Cotton, I don't think a vocal booth needs anything as heavy-handed as an extra wall layer. That affects only very low frequencies, far below what anyone could ever sing! Most vocal booths just use fiberglass or foam or whatever all over, which is sufficient for vocal frequencies. Though if you plan to stick a bass or guitar amp in there occasionally, that's a different matter. --Ethan

The main thing is to not kill the highs and to make sure you lower the low-mids. Maybe try something like this The slot at the bottom will stop the parallel walls and the slots will keep the highs diffused. Cheers john

Thanks guys that's just what I needed. I'll be sure to post some pics when I get finished. Cottonmouth

nice plan.... i have same situation with my vocal booth but i have 2 opposite wall angled from centre to near about 9-10 degree...... can i use these angled wall as slot resonator..... i think cloth (some rough and burlap stuff) and the angled walls are good enough to absorb highs and the resonators would be better at low mids? Well i have a initial thought for slot resonator: As i read at SAE making lots' of holes on surface like drywall and plywood acts as a good resonator, i am willing to cut lots' of medium size circles on drywall I think, it gives a good look also and same time it works optimum too. Can i proceed ? Krish

krish - is there an airspace behind the angled walls - there must be if you want to create a slot resonator. Burlap on it's own won't absorb many highs, the cloth usually covers 3" - 4" od insulation behind it. cheers john

thank you very much for replying John! I have a space behind angled wall 50mm to 150 mm. So are you setisfied with my plan for broadband slot resonator? cheers krish

John, I was wondering what kinda piece of software you use to draw those nice construction plans?? kind regards, ro

I have a space behind angled wall 50mm to 150 mm.

That will work, krish. ro - I use a drawing program called Smartdraw. http://www.smartdraw.com You can download a trial version for free if you want to try it out. cheers john

John Please Check out this plan : I already have a standard drywall ceiling, insulation underneath. The other two contrasting wall have insulation covered by cloth. In case of floor the carpet is there. cheers Krish

I'm not sure about using drywall for the slots check out the perforated board Sjoko used in his studio cheers john

Hey John! Check if it will work for slot resonator...... although its' made by the same content unsed in drywall. have a nice day Krish

yes it would work BUT it's all the one frequency - you need to vary the hole sizes to get a decent broadband absorption. cheers john

First of all i would like to know whether room shape and dimension affects the vocal environment also or not? John I have seen some great slot resonator made by you for your clients, can you have any case study related to it. I would like to use it for my vocal booth, if you will allow. Krish

can you have any case study related to it.

what do you mean Krish??

well i just need if you can give some details regarding a good slat resonator that can work like a wide-band resonator. Krish

Krish - click on the John Sayers Productions logo (upper right on this page) and goto Wall units. There you will find directions to construct a broadband slot resonator. cheers john

:shock: can i build this? Preparing the plan for wide-band slot resonator...... krish

yup - that looks fine ;) cheers john

:D thaks for verifying.. in case of slat resonator wall, my walls are horizontally angled so i have to put the timber slats vertically or horizontally? Krish

In your case it doesn't matter :wink: cheers john

care to guide me for the broadband slat rsonator tuned for the low mids suitable for vocal frequenices. I have following gap between my walls 50mm to 150 mm. krish

Go here and click on Helmholtz calculator http://www.saecollege.de/reference_material/index.html cheers John

:( i am not sure i am calculating properly or not but using slot resonator calculator i am getting a high width size for the slats and very small width for slot around 6mm 10 mm 12 mm....... i have 75mm to 150 mm wall depth. The wall size is around 5'x8'.

Yeah - that's about right. With a 6" x 1" slat and a 5mm (1/4") gap you should be able to get down to around 285hz at the 150mm (6") depth. cheers john