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Need help with acoustic design / management
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martyn
IsraTrance Junior Member
Started Topics :
40
Posts :
389
Posted : Sep 30, 2007 13:50
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On 2007-04-14 16:12, Boobytrip wrote:
I just covered my studio walls with high-density rockwool & cloth and built superchunk basstraps in the corners.
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could you post some pictures? that would be interesting to see (e.g. how many m3 of the walls you covered, where you placed it etc.)
  www.myspace.com/mentris |
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vipal
IsraTrance Full Member
Started Topics :
123
Posts :
1397
Posted : Oct 1, 2007 01:49
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+1 |
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
Posts :
988
Posted : Oct 1, 2007 10:18
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No problem, i'll post some pics tomorrow.
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shamantrixx
Started Topics :
7
Posts :
549
Posted : Oct 1, 2007 10:47
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On 2007-04-05 18:19, Djones wrote:
I have my desk in the corner of my room.
So this means, that my right monitor is in the corner of my room...
and all of a sudden I felt a deep bass coming my way.
...only in a straight line from my right speaker did I feel the bass.
I think this really has to do with the reflections coming from the corner.
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Corner of the room is really a bad place to place your monitor. It should be at least a meter away from the back and side wall. When you place it near the corner the side wall reflects the sound just a fraction of second after the sound comes out of the speaker and you hear something like a comb filter with nasty bass boost. Diffusion foam on the side wall will help but not nearly as much as it would help to move monitor away from the corner. If you can't do that at least try to adjust your setup to be as symmetrical as possible keeping back and side wall distances in mind as well as the reflection surface behind your back. Diffusion foams can help in correcting this but they can never make a symmetric reflection.
"It occurred to me by intuition, and music was the driving force behind that intuition. My discovery was the result of musical perception"
Albert Einstein, speaking about his theory of relativity |
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Elad
Tsabeat/Sattel Battle
Started Topics :
158
Posts :
5306
Posted : Oct 1, 2007 14:02
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On 2007-04-05 17:41, --==Bad Sector==-- wrote:
does foam and thermocol affect the mids and highs 
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only them
if u want to remove SUB reflection it takes huge box about 100kg filled with the most density wool
www.sattelbattle.com
http://yoavweinberg.weebly.com/ |
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Trip-
IsraTrance Team
Started Topics :
101
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3239
Posted : Oct 2, 2007 00:31
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I wouldn't say that's entirely correct for low freqs.
A substaincial amount of lower density wool would work better for low freqs absorbtion.
Polyester foam-corners should go as low as 100Hz (high quality ones). Reaching lower frequencies absorbtion should be achieved using mineral wool (or more expensive foam i.e Auralex).
Might I add, you can't measure acoustic material effectivity with kilograms. Since it's not really weight related, but length/size - it shall rather be done in meters.
Crackling universes dive into their own neverending crackle...
AgalactiA |
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
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988
Posted : Oct 2, 2007 10:56
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Ghello, here are some pics of my garden shed, converted into a project-studio  Please note that it is still work in progress: i'm planning to build two more super-chunk cornertraps, which will be placed behind the speakers and i will fix several absorber panels about 25 centimeters below the ceiling. I'll also finish the staple-lines of the canvas with thin strips of wood for cosmetic reasons. There was still some studio left at the end of my money, so i'll have to wait a bit 
I used high-density rockwool panels (150 Kg/m3), which may be a little too dense (not sure), but in my perception they work excellent: the sound in my shed is pretty tight and controlled and outside i hear nothing but a minimal whisper when i'm playing music at a loud volume. Note that i don't have a problem with contact-sound transmission, since there are no adjacent rooms.
http://s238.photobucket.com/albums/ff120/boobytrip/planet_boobytrip/
to be continued...
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martyn
IsraTrance Junior Member
Started Topics :
40
Posts :
389
Posted : Oct 3, 2007 12:14
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thank you for the pics!
i`m thinking of building rockwool-basstraps for some corners in my room but i'm a bit sceptical. first thing are the particles that can be inhaled and do harm to the lungs - maybe less than some years ago (due to new laws) but enough to make me feel uncomfortable with that in my room. as i read in a lot of threads/ articles this could reduced by covering the rockwool with fabric - but: second thing is formaldehyde (and ingredients like that) which won't be held back by fabric.
a solution might be to put the rockwool into plastic-bags. however this might reduce the acoustic qualities because high frequencies will be reflected. but due to the fact that i have only this room and sleep here, too, i wouldnt be glad to have even more poison in here. what are your opinions?
does anybody know of "healthier" materials for basstraps? what about pillows (e.g. polyester) and things like that?
regards - martyn
www.myspace.com/mentris |
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Trip-
IsraTrance Team
Started Topics :
101
Posts :
3239
Posted : Oct 3, 2007 20:30
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You can try AcoustiCotton.
Crackling universes dive into their own neverending crackle...
AgalactiA |
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
Posts :
988
Posted : Oct 4, 2007 09:39
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On 2007-10-03 12:14, martyn wrote:
thank you for the pics!
i`m thinking of building rockwool-basstraps for some corners in my room but i'm a bit sceptical. first thing are the particles that can be inhaled and do harm to the lungs - maybe less than some years ago (due to new laws) but enough to make me feel uncomfortable with that in my room. as i read in a lot of threads/ articles this could reduced by covering the rockwool with fabric - but: second thing is formaldehyde (and ingredients like that) which won't be held back by fabric.
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I had the same concerns, but after some research i decided to spray the rockwool with hairspray and covered them with fabric to reduce the load of airborne particles. I'm also building a silent fan to provide suffient ventilation. I'm afraid that there are only few materials with the same favorable mass and openness characteristics as rockwool. Anyway, what good is good health if you can have a killer sound 
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Trip-
IsraTrance Team
Started Topics :
101
Posts :
3239
Posted : Oct 4, 2007 12:29
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I believe fabric is enough... at least for me.
Hey, no one has died from it (yet)
Crackling universes dive into their own neverending crackle...
AgalactiA |
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martyn
IsraTrance Junior Member
Started Topics :
40
Posts :
389
Posted : Oct 4, 2007 18:18
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On 2007-10-04 09:39, Boobytrip wrote:
Anyway, what good is good health if you can have a killer sound
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of course! you will get chronic cough but it will sound great 
there seem to be at least two ecological alternatives (for wimps like me )
wooden-weak-fibre-panels ("Holzweichfaserplatten")
- afaik these are often used in professional studios these days
- they are available in different densities (e.g. 60 kg/m³ - sorry, i'm too lazy to translate those dimensions into inch etcetera)
- disadvantage: expensive in comparison to mineral-wool
cellulose
- made out of recovered paper
- available as panels (e.g. 10mm thickness, 80 kg/m³)
--> disadvantage: also very expensive (about 20 Euro/m²)
- also available as bags (e.g. 12,5 kg each, 110 kg/m³)
- seem to be chaper
the density of those materials looks good to me, should be matchable with mineral-wool - apart from the price...
i tend to try some (cheaper) bags of cellulose and put at least one of them behind my desk to tame the bass. does anybody have experience with bags of insulating material (instead of panels?).
@ trip: the woman from the construction material store told me, that acoustical cotton disappeared from the german market over night some years ago because the name or patent was bought by a car-concern or so... what a pity
regards - martyn
www.myspace.com/mentris |
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subconsciousmind
SCM
Started Topics :
37
Posts :
1033
Posted : Oct 4, 2007 23:41
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Hi,
I posted this in the other thread here too, but I thought maybe some wont see it there:
You sit in your listening position
a friend takes a portable mirror and moves it a long the wall to your right.
you keep your head in your listening position but look into the mirror.
As soon as you can see a speaker in the mirror you know that this (the position where the mirror now is), is the position to put your first absorber.
Repeat leftside and, if possible, ceiling.
By the way
http://www.etfacoustic.com/index.html
its a company which sells a room meassurement program plus calibrated mic+preamp.
Its not easy to use at first, but once you know it, its easy. you can even do some meassurements with the demo version and any mic, its not accurate but still you can make "before - after" comparisons.
all in all, hard+soft, its about 500 USD, but if you are a couple of guys together and at least one is a bit of a geek in that area you can buy it and then meassure the frequency response of your speakers in your room as well as the reflections and more quite accurate... if you hire a guy to do it he will charge the same..
Most of my music for you to download at:
http://www.subconsciousmind.ch |
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martyn
IsraTrance Junior Member
Started Topics :
40
Posts :
389
Posted : Oct 4, 2007 23:50
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today i used the version of room measurement described here: http://www.realtraps.com/test-cd.htm
it's basically a (free) test-tone-cd that plays sine-tones from 10hz to 300 hz in 1hz-steps.
dB is measured with a dB-meter in listening-position. for beginners like me its an easy way to get a rough picture of the room-modes. (and, by the way, they look terrible in my untreatened room. time to change that)
@subconsciousmind: maybe i'll try the EFT program, seems to be a little more comfortable than the method i described above.
regards - martyn
www.myspace.com/mentris |
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
Posts :
988
Posted : Oct 5, 2007 10:20
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Hi Martyn,
I also think the bags may be the best alternative. But keep in mind that you need as much mass as possible to absorb enough bass-energy. Anoter concern could be that the cellulose is more flamable than mineral wool. As for the cough: i have no problems whatsoever with too many airborne particles at my place. It might be that there is some formaldehyde in the air, but if there is it is too little to be able to smell it, so i guess that the health-risks are minimal.
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