Advice needed on placing absortion

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Advice needed on placing absortion

Postby Marlon Wolterink » Sun Mar 21, 2004 10:21 pm


My first post here!
My room suffers from standing waves at around 100 Hz, ( actually, low frequencies in general) and I would like some advice on where to put bass absorbers.
My room is a odd shaped one, follow the link below: ... %20map.gif

The way the mixing desk etc. is set up is the only way for me , because of the limited space I have available.

My monitors are standing on my desk their back facing the window( no monitors on this pic, but the should be left and right of the lcd-screens). Is this advicable considering the small distance to the walls and window ( glass absorbs low frequencies, but does it help here?) see link: ... C00018.JPG

I have only one square corner in this room and I have started to build a cornertrap there: ... C00016.JPG

The other corner isn't a square one, it is a old chimney: ... C00017.JPG

Other cornertraps I plan to build are between the wall opposing the mixing desk and ceiling, ( ahh, the multi functional use of mic stands!) ... C00019.JPG

Am I going in the right direction, or am I overseeing something?

Any advice is appreciated!

Marlon Wolterink
Marlon Wolterink
Posts: 63
Joined: Sun Mar 21, 2004 9:52 pm
Location: Meddo, the Netherlands

Postby Dan Nelson » Mon Mar 22, 2004 4:21 am

Has what you have done so far improved the room? What is the construction of the room? Mixing in the cubby is most likely causing some of your problems. I have had some friends with rooms much like yours and they moved the mixing area out into the room when they mixed and push it into the cubby to record.

Dan Nelson
Posts: 629
Joined: Sat Jan 31, 2004 2:52 am

Postby Marlon Wolterink » Mon Mar 22, 2004 11:29 am


thanx for the reply!
The acoustic seem to be more even, i.e dryer.
The low end also seem more even when I play back pink noise, but a 100 hz sine wave still produces cancellation and notches throughout the room. On the listening position stil a dip around 100 Hz. I will take further, more extended measurements later this week.
I don't understand what you mean with ''cubby'', I assume it is the area where I have my mixing desk?
Unfortunately, I can't move it instantly ( big heavy desk,no wheels etc.), so do I have to rearrange the room?

All of the walls except the one facing the desk are brick wall. The other is a made of air-entrained concrete, the seeling is made of hardboard with insulation material behind it.
Floor is covered with carpet, the ''no wear'' type.

Marlon Wolterink.
Marlon Wolterink
Posts: 63
Joined: Sun Mar 21, 2004 9:52 pm
Location: Meddo, the Netherlands

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