hello from brazil!

ALÉCIO COSTA - BRAZIL · Tue Apr 01, 2003 7:30 am

hi!

1) is there any advantage making these wood frame boxes with mdf instead of regular plywood?

2) also, which thickness of wood would not diminish the efficiency of the Owens Crow rock wool? I read that this support wood reduces LF absorbtion .

3) as things change names when moving between countries, what is another name of pink insulation, used on ceiling tiles?

Here in Brazil, for example, there are OWC factories but no one knows their stuff as 703 or 705, just basically called rock wool.

thanks again

Post by **John Sayers** » Tue Apr 01, 2003 9:14 am

ALÉCIO COSTA - BRAZIL wrote:hi!

1) is there any advantage making these wood frame boxes with mdf instead of regular plywood?

You can use either.

2) also, which thickness of wood would not diminish the efficiency of the Owens Crow rock wool? I read that this support wood reduces LF absorbtion .

sorry I don't understand the question.

3) as things change names when moving between countries, what is another name of pink insulation, used on ceiling tiles?

Here in Brazil, for example, there are OWC factories but no one knows their stuff as 703 or 705, just basically called rock wool.

If you can't get a rigid fibreglass then rockwool will do in this case.

cheers
JOhn

ALÉCIO COSTA - BRAZIL · Tue Apr 01, 2003 2:19 pm

many thanks sir!!
1) i was watching your projects pictures, like the first two studios . what is the material guys put over all that rockwool at control room? it does not seem to be cloth.

2)regarding rockwool. must i keept it glued, loose or inside a plastic sack between ceilings? hmax is 2.76 hsweet spot= 2.36m

thanks again
nice tuesday

Post by **John Sayers** » Tue Apr 01, 2003 4:32 pm

that's just cloth Alecio - i don't quiite understand you second question - if it's in the ceilng it's just sitting on the ceiling??

cheers
JOhn

ALÉCIO COSTA - BRAZIL · Wed Apr 02, 2003 3:14 am

Thanks Sir!
I have just found a nice rigid fiberglass dealer here. There is a special type that comes already with cloth over it. They say it can be glued directly to the walls with PVA white glue.

Also, this special cloth can be painted with a PVA tint, I think so. It is a little more expensive.. but seems to work. what is your opinion?

yes, I was referring to loose fiberglass between ceilings. so oka, right?

in terms of percentage, how much absoprtion quality do we gain using rigid fiberglass on walls and corner bass traps instead of regular rock wool?

I think this company´s rigid fiberglass is 5cm thick and the cloth cover is named glass fabric

thanks
nice tuesday

Post by **John Sayers** » Wed Apr 02, 2003 8:21 am

It sounds like a rigis finerglass which means it would be better than standard rockwool.

cheers
john

ALÉCIO COSTA - BRAZIL · Wed Apr 02, 2003 3:44 pm

John, I was examining the fine pics of your site and in some cases the rockwool/fiberglass applied to walls and ceilings is covered with "gesso panels". I think you call it plaster or gypsium I dunno.

1) Do they reduce the fiber efficiency?
2) Is i better just to keep with fabric?
3) As years go by, won´t glued wall fiberglass start to cumble/fall?
I will apply thick fg in the sweet spot backwall.

4) what are the characteristics of wood? does it reflect too much? not a good idea using it unpainted for the side walls?

Million thanks!

Post by **John Sayers** » Wed Apr 02, 2003 10:46 pm

"gesso panels".

i don't understand

cheers
john

ALÉCIO COSTA - BRAZIL · Thu Apr 03, 2003 1:43 am

you call it plaster panels. so? what about the other items?
Many thanks
Nice thursday

Post by **John Sayers** » Thu Apr 03, 2003 9:55 am

plaster, gesso, call it what you like I still don't understand what you mean. If the insulation is covered with plaster then it's a new wall other wise if cloth it's a high frequency absorber.

I must say this Alecio - it appears that you really can't understand drawings and plans and you can't interpret pictures and drawings. That's fine - you probably can't understand circuit diagrams either, yet you don't try to design and build your own mic preamps, so why should try to build your own studio.

I suggest you hire someone to design and build your studio, just like you do with your mic preamps.

cheers
john

ALÉCIO COSTA - BRAZIL · Thu Apr 03, 2003 11:00 pm

!!!!
Yes, I can understand some of the stuff. However, sometimes things are not very clear. i even showed some pics to a constructer and most were quite understandable. Please, some things are not so easy to have a direct translation.
Sorry for any confusion or incovenience, but I am not "so stupid".

ALÉCIO COSTA - BRAZIL · Thu Apr 03, 2003 11:04 pm

oh, I forgot...
Many Thanks for all your patience and help!

Post by **John Sayers** » Thu Apr 03, 2003 11:24 pm

Mate - I'm not meaning to be rude, OK? I know you read all the posts at PSW where we talked about control room designs and absorbers and diffusers bass traps etc etc. either you pick it up or you don't. you're probably a fantastic musician or a great singer or both but you don't appear to have the aptitude to go about doing your own acoustics.

sorry for trying to be honest

cheers
john

ALÉCIO COSTA - BRAZIL · Fri Apr 04, 2003 12:25 am

oka. I jut would have preferred that PM. lol
I know I am an acoustic moron!lol
My powers is at recording, arranging, producing,performing.
If we need a doctor we...
If we need a dentist...
If we need an acoustic designer...

Post by **John Sayers** » Fri Apr 04, 2003 7:31 am

Yes I know I should have made it a PM, sorry, but it's actually something I wanted others to read because it can also refer to them. All the info is available through this site, at the SAE or in real picture form at the studios under construction site. I'm happy to make comment on that info, but I'm not here to spoon feed people the basics.

Sorry if I offended you, my bad, but I do believe I have a point worth noting.

I also bet you are a good muso

;)

cheers
john