703 at 4inch thick ok for bass trap & PICS

[singing_lad]

Hi everyone,

I'm new here

Just looking at buying aload of Owens-Corning 703 Fiber Glass... I noticed 705 is suggested in an article but I don't know anywhere in the UK that sells this stuff.

Could 703 at 4inch thick be ok for a bass trap or not?


I'm looking for the best option for acoustic treatment of my room... please pay no attension to where my studio is at the mo. I'm looking to invest in some ridgid riber glass etc. I know its best to be sat 38% of the room So I am thinking about moving my studio infront of the window.

I know about where the standard absorbtion should be,, all the mirror/reflective points points etc... but its just these few things that are throwing me abit.

The room walls are all made of brick with a layer of plaster over. and I intend to hang 4 slabs of 2inch thick 703 fiber glass from the ceiling too... didn't know if this needs to be 4inch?

Please view these pics to see the room...

craigpowellonline.com/newsiteimages/studio1.jpg

craigpowellonline.com/newsiteimages/studio2.jpg

craigpowellonline.com/newsiteimages/studio3.jpg

my first question is, on the slopeing part of the ceiling where would the bas traps go??

2nd. Would it be best for the window to be behind my monitors and studio gear.. with a curtain up over the window and acoustic tiles either side of the window? (behind each monitor)

3rd... doors are my other concern, 2 doors at what will be the back of the room. Do these need more tiles stuck on than what would be on the wall or just the same?

4, how would I put a bass trap in all corners as 2 corners have doors???


Hope somone can shed some light.

 

[pandamonk]

Hi everyone,

I'm new here

Just looking at buying aload of Owens-Corning 703 Fiber Glass... I noticed 705 is suggested in an article but I don't know anywhere in the UK that sells this stuff.

Could 703 at 4inch thick be ok for a bass trap or not?


I'm looking for the best option for acoustic treatment of my room... please pay no attension to where my studio is at the mo. I'm looking to invest in some ridgid riber glass etc. I know its best to be sat 38% of the room So I am thinking about moving my studio infront of the window.

I know about where the standard absorbtion should be,, all the mirror/reflective points points etc... but its just these few things that are throwing me abit.

The room walls are all made of brick with a layer of plaster over. and I intend to hang 4 slabs of 2inch thick 703 fiber glass from the ceiling too... didn't know if this needs to be 4inch?

Please view these pics to see the room...

craigpowellonline.com/newsiteimages/studio1.jpg

craigpowellonline.com/newsiteimages/studio2.jpg

craigpowellonline.com/newsiteimages/studio3.jpg

my first question is, on the sloping part of the ceiling where would the bas traps go??

2nd. Would it be best for the window to be behind my monitors and studio gear.. with a curtain up over the window and acoustic tiles either side of the window? (behind each monitor)

3rd... doors are my other concern, 2 doors at what will be the back of the room. Do these need more tiles stuck on than what would be on the wall or just the same?

4, how would I put a bass trap in all corners as 2 corners have doors???


Hope somone can shed some light.

In the UK you can buy 10 4'x2'x2" Knauf Rocksilk RS45 slabs for £20-£30. Many builders/timber merchants will order it for you. I got mine from Rowan Timber for £20, but you can get it from travis perkins and others.

Yes move your mixing position to the window with speakers firing down the longest dimension, and make sure your sweet spot(where you sit in an equilateral triangle with your speakers) is 38%.

2" should be fine for the ceiling. Minimum I'd recommend is 1 cloud, but more could offer additional benefit.

If you hang flat on the sloped part of the ceiling, it won't act as a bass trap.

Yes a heavy curtain at the window(maybe extending past the right side of the window to make it symmetrical), and your bass traps in the corners should be enough behind the speakers.

A closed door just acts like part of the wall, so if you plan to cover the back wall with absorption, you will need to cover the doors just like the wall. Maybe one panel per door.

If the corners have doors, then you can't hang a bass trap there, but bass frequencies are omnidirectional, so you don't just need to hang on the vertical corners. The wall-ceiling corners work just as well, so hang up there.

 

[singing_lad]

thats great thank you... a few more things

how is the best way to make sure it is a perfect trinagle and the 38% position? string??


will the Knauf RS45 stuff be ok to use as a bass trap if I double it up and stradel the corners and ceiling to all parts with 16inch air inbetween?

 

[singing_lad]

also what mm do I need of the Knauf Rocksilk RS45? still 2inch aka about 50mm?

how much space should there be between the ceiling and the hanging tiles?? or should they stick right too the ceiling?

Cheers again

 

[pandamonk]

thats great thank you... a few more things

how is the best way to make sure it is a perfect trinagle and the 38% position? string??


will the Knauf RS45 stuff be ok to use as a bass trap if I double it up and stradel the corners and ceiling to all parts with 16inch air inbetween?

Yeah string or measuring tape between the tweeters and to your ears. Also make sure the speakers are angled 30degrees towards your ears.

Yeah double it and straddle the corners. What do you mean "...to all parts with 16inch air inbetween"?

 

[pandamonk]

also what mm do I need of the Knauf Rocksilk RS45? still 2inch aka about 50mm?

how much space should there be between the ceiling and the hanging tiles?? or should they stick right too the ceiling?

Cheers again

2" is roughly 50mm.

An air-gap between ceiling, walls, etc, and the panel will increase lower frequency absorption. What i did was to build 2" frames behind the panel, instead of around it, to space it 2" from the wall/ceiling and to leave the edges exposed(more absorbent area).

 

[singing_lad]

I mean Im going to leave 16inch gap between the basstraps and the corner

Thanks, your advice as really really helpped me...

im currently sorting out the new positioning now,,

would it be bad for me to have my monitors about 11inch away from the wall,, and my monitor screen and keyboard and comp at the 38% position,, or just infront of me,,, so i can hear it perfectly as I mix,., or will the monitor block some of the stereo field if I do that?? at the moment,, I have the monitor screen and keyboard synth on the same unit.. maybe I need to have the monitor on a different desk or something,, which stays inbetween the monitors? but my mouse and synth will be with me at the 38% position.. if that makes any scense?

 

[singing_lad]

2" is roughly 50mm.

An air-gap between ceiling, walls, etc, and the panel will increase lower frequency absorption. What i did was to build 2" frames behind the panel, instead of around it, to space it 2" from the wall/ceiling and to leave the edges exposed(more absorbent area).

So if I did that with all panels.. would that be over the top or beter for my control room? rather than just stick all the standard tiles to the wall?

 

[pandamonk]

I mean Im going to leave 16inch gap between the basstraps and the corner

Thanks, your advice as really really helpped me...

im currently sorting out the new positioning now,,

would it be bad for me to have my monitors about 11inch away from the wall,, and my monitor screen and keyboard and comp at the 38% position,, or just infront of me,,, so i can hear it perfectly as I mix,., or will the monitor block some of the stereo field if I do that?? at the moment,, I have the monitor screen and keyboard synth on the same unit.. maybe I need to have the monitor on a different desk or something,, which stays inbetween the monitors? but my mouse and synth will be with me at the 38% position.. if that makes any scense?

By straddling the corner it leaves 16" behind the bass trap? Ahh ok. Your screen, keyboard etc shouldn't be at 38%, YOU should be at 38% with your monitors, screen, comp, etc closer to the wall. It's probably best not to put your screen etc in front of your monitors. 11" from the wall should be fine. It's good to space your monitors from the wall.

 

[singing_lad]

I wasn't too clear, sorry

I mean should I be mixing at the 38% position...

or do I move to the 38% position to hear how everything is sitting in the mix correctly?

If you can look at the studio 2 picture in my 1st post... is it ok to have a small triangle with the monitor speakers fairly close to my monitor screen? or should you try and make the triangle as big as possible for a better stereo image? This is my problem you see...

if my monitor speakers are far apart.... to make the triangle I have to sit with my keyboard further back.... do you see what I mean... sorry, im bad at this!!!

 

[pandamonk]

So if I did that with all panels.. would that be over the top or beter for my control room? rather than just stick all the standard tiles to the wall?

It'll be better. A 2" panel theoretically absorbs well down to 1700Hz and then tails off, but spacing it makes it act more like a 4" panel, so should absorb well down to 850Hz before tailing off.

 

[pandamonk]

I wasn't too clear, sorry

I mean should I be mixing at the 38% position...

or do I move to the 38% position to hear how everything is sitting in the mix correctly?

If you can look at the studio 2 picture in my 1st post... is it ok to have a small triangle with the monitor speakers fairly close to my monitor screen? or should you try and make the triangle as big as possible for a better stereo image? This is my problem you see...

if my monitor speakers are far apart.... to make the triangle I have to sit with my keyboard further back.... do you see what I mean... sorry, im bad at this!!!

Your ears should be at 38% of the room dimension. That is where you always mix.

As far apart as possible(this might be 3-4' to sit comfortably). I do see what you mean though.

 

[singing_lad]

thanks for all your help

will be putting it all to practise this week...

can anyone suggest a good cheap material and where to get it from to cover the fiberglass?

cheers

 

[pandamonk]

thanks for all your help

will be putting it all to practise this week...

can anyone suggest a good cheap material and where to get it from to cover the fiberglass?

cheers

I just bought material from ebay. It's best if you can get 60" rolls and you need roughly 5' of it per panel. Less than 60", down to 48", and you will have to cut the other way, which means you will need 7' per panel.

 

[singing_lad]

excellent,, can you send me a link to the stuff you just got please?

 

[pandamonk]

excellent,, can you send me a link to the stuff you just got please?

I didn't JUST buy it. Sorry for being unclear. I bought material from pandoras upholstery on ebay, but there are others. Just follow something like this, or whatever you like, and you might get it pretty cheap. For that roll, they claim the RRP is £38.99/m, which makes that roll retail at over £1k. If you don't believe that, even at £2/m it's worth £56. You might get it for around £30 if you're lucky.

I've bought 4 rolls of fabric from them. 3 of them roughly 20-25m each, which all came to just over £100 including p&p. I also bought over 80m of curtain lining, for the backs of my panels, for really cheap(can't remember exact prices, maybe £30+P&P). I planned to make them to sell, but after making enough for myself, i decided against that plan.

 

[singing_lad]

ok cool, I will keep a watch and see what I can get it for...

thanks for all your help!

All the info should make a huge difference!