Hey Johnny!

  • Thread starter Thread starter darnold
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darnold

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Im back with some more questions for yah Johnny.

First of all, its the tracking room where most of the recording will be done. Its 14x16ft big with all parallel walls. I will have plans for you soon. All the walls will soon be drywall.

I was wondering if you knew what the STC Rating was for R11 and R19 Fiberglass Insulation. Im having a hard time finding the rigid fiberglass and the rockwool stuff so i need to work with what i have. What i had in mind with this is to mount it to cardboard and quilt it with some fabric. Then maybe if it was needed i would add a couple of buttons to press it to mic concave dips. I would make these 24" wide. I thought the best way to mount these was to have 5 strips for each wall. 3 Going down the center of the wall length from left to right, and 2 on the sides of those with length going up and down. I was thinking i would do these on the walls to the right and the left of the room. Infront i would have some sort of difussion then have 2 of the fiberglass strips on the left and right side of the difussion wall. I was thinking of using R19 because being 6 1/2 inches thick i thought it would brake up bass frequencies well. Also i would leave about a foot of gap between each strip so that it would still reflect a little and not be too dead.

I also mentioned the Celotex in a previous thread. You said that this would work pretty good for absorbing.
http://www.bpb-celotex.com/abstracts/LCD-4005-600.pdf
I was thinking this would be much easier to work with and might be a little easier to understand. But it is a little more costly than the fiberglass insulation. I do know that if i used this stuff i would need to build a bass trap for the corners to get the 125-250hz. So tell me what you think of that. I think the the price of the Celotex is around $25 for a 4x8 panel. Thats not too bad but considering i could do around 75 to 125 sq ft with one roll of fiberglass insulation batt.

Let me know what you think about this. What do you recommend. I will have around $700 to spend in a few weeks on some studio construction, although that includes building the ceiling.

Thanks John,

Danny
 
Johnny - Ha! only my older sisters ever call me that :):)

yes - the celotex 600! looks ok for your purposes but that 6 1/2" R19 would also work well. Instead of cardboard try fibreboard for mounting the stuff. That's what we did here if you look under the speakers.

music%20farm6.jpg


If you place that celotex off the wall you'll get some pretty good absorption in the low frequencies for your bass traps.

cheers
john
 
Hey cool.

Im gonna go check out exact pricing on the celotex. It will probably be a little more expensive to use but much less to work with. So your saying that i wont need need too much in the bass trap area if i use this stuff? That would be great. How much of this stuff do you think i would need on my walls? I was thinking only one panel on each wall would do alright then maybe cutting a panel into some pieces and placing them where else was needed. If i did the 2x4 diffusion would that make a good sounding room? Im also trying to decide if i would rather have a dead room or a diffused room.

Also, i thought about this Celotex for my cieling as well. Right now all i have is open joists. I was wondering if i could put the 2" celotex right on the joists then put the drywall (fiberboard) over the top. I was hoping that the Celotex would work as a flexible channel along with a good absorber.

Thanks Johnny! (heh)

Danny
 
Only use the celotex where it is exposed. I wouldn't use it in the ceiling cavity - get some R19 rockwool or equivalent for that use. I'd definitely put some on the ceiling surface (after the drywall)

cheers
johnny :)
 
Cool.

I meant actually that the Celotex on the cieling would be between the drywall and teh joists. The celotex would be the flexible channel instead of the iluminum beams you can get. They probably wouldnt do too much to deaden the sound but i thought they would help a little. I would probably still put some R19 insulation between the joist cavities. I also cant seem to get rockwool around here. I am just in a location where people dont use that kind of stuff so its difficult to get here.

I was also lookin at some pictures and plans of the studios youve designed. i noticed most of those use mainly diffusion and slot resonators instead of loads of acoustic foam and other obsorbtion. Does that kind of technique only work with large rooms or is a 14x16 ft room big enough for something like that? I record a large variety of music but rock would be something i would do the most. So would more of a live recording room suite what i needed for with tracking? Or would dead be better?

I know some of those questions are kinda newbie questions and i probably already know the answer. But i want to make sure i dont make any mistakes when im doing my studio. Im thinking more of a dead room would be better although not completely dead.

Lets me know what you think.

Danny
 
Danny - there is DEAD and then there's dead.

DEAD is what most people associate with a room lined with foam where all the highs are sucked up yet the low end is still reverberant. Your voice sounds dull when you talk in a room like this.

dead on the other hand is where the lows are also absorbed and the highs still remain in the reverberant field. That's why I use slots to absorb and diffuse the lows yet they still reflect the highs.
Your voice still sounds clear and bright in a room like this.

cheers
john
 
Thanks for clearing that all up with me.

So what your saying is that i should probably build slot resonators instead for my sound. I imagine there needs to be some highs absorbed though to balance the room out.

Sounds good but i will probably need some help later on the size and stuff of the resonators.

Also, what did you think about the celotex flexible channel on the cieling idea?

Danny
 
Also, what did you think about the celotex flexible channel on the cieling idea?
Click to expand...

I'm sorry - I didn't quite follow you on that one. I can't see how you could use fibreglass as a channel??

cheers
JOhn
 
Heh,

sorry john, maybe im confused about what the flexible channel is. I thought usually the flexible channel that you put between the joists and the drywall with a wall or cieling was usually aluminum, because vibrations dont transfer through the joists to the drywall. I thought this does basically what a staggered stud wall does to help sound proof stuff.

However, checking for what i could get as far as aluminum around here, it would be quite difficult to get stuff like that for cheap, thus i came up with the idea of putting the celotex in between the joists and the drywall. I thought that since celotex is clearly flexible, this would break up vibrations from transfering sound pressures, and also since it is a insulation type, it might also absorb a few of the other frequencies also.

I could be way off on this, but thats just how i understood it.

let me know what you think, and sorry for the confusion.

Danny
 
Ah I see - no I wouldn't use it like that. Have you checked out longsoughtfor's studio thread where he describes how he did his ceiling??

cheers
john
 
John,

The thread "Where's the best place to buy resilient channel?" has gotten into some acoustic questions that are waaaaay beyond me. Any chance of you weighing in over there?

Thanks!
-lee-
 
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