How to get rid of the 125Hz monster

[vaas]

Hi all,

I could use some advise on the acoustics of my home studio. In the drawing you can see the room I use to mix in. I also record vocals and acoustic instruments here but that's another story. Measurements are in centimeters.

My main problem is this. When mixing, there's a huge boost in the 125Hz region right at the chair I'm sitting in. When I stand up or move to the back of the room, the boost is gone. The boost somehow concentrates on the area around the chair. I tried to get rid of the boost by installing a triangular pile of rockwool covered in cloth in each corner of the room, standing about 120cm high. It didn't have the desired effect. Besides this, the room doesn't have any acoustic treatment whatsoever.

I know there's a lot of info to find on acoustics, but I was wondering if you guys might have a simple solution to defeat the 125Hz monster. Is this particular frequency a common issue?

Thanks
vaas

[yllet]

Originally Posted by vaas

Hi all,

I could use some advise on the acoustics of my home studio. In the drawing you can see the room I use to mix in. I also record vocals and acoustic instruments here but that's another story. Measurements are in centimeters.

My main problem is this. When mixing, there's a huge boost in the 125Hz region right at the chair I'm sitting in. When I stand up or move to the back of the room, the boost is gone. The boost somehow concentrates on the area around the chair. I tried to get rid of the boost by installing a triangular pile of rockwool covered in cloth in each corner of the room, standing about 120cm high. It didn't have the desired effect. Besides this, the room doesn't have any acoustic treatment whatsoever.

I know there's a lot of info to find on acoustics, but I was wondering if you guys might have a simple solution to defeat the 125Hz monster. Is this particular frequency a common issue?

Thanks
vaas

You need to build/buy a special designed trap that focus around that area, easy as that

The not recommended method is to put a eq on the masterbuss and dip it at 125 hz with a small q value... Don't forget to remove it when mixdown or using headphones...

I have the same problem, but leared to ignore it.

/Jon

[Ethan Winer]

Originally Posted by vaas

was wondering if you guys might have a simple solution to defeat the 125Hz monster. Is this particular frequency a common issue?

All bass frequencies are a common issue in rooms that size. The solution is bass traps. Lots of them. I also suggest you slide your setup to the right, to be centered left-right in the room. Then experiment with speaker placement. This requires measuring the LF response at high resolution as you try different speaker placements. More here:

How to set up a room

And here's my standard list of room measuring links:

Room EQ Wizard, Windows and Linux and Mac OSX 10.4+, Freeware
ETF, Windows, $150
FuzzMeasure, Mac, $150
Room Measuring Primer
Comparison of Ten Measuring Microphones

--Ethan

________________
The Acoustic Treatment Experts

[nixoblivion]

Are you sure 125Hz is your problem?
from looking at your room, you should have big problems at 69Hz and 138Hz...

How high is your ceiling?
It all depends on how much work you want to have.

The traps help a bit more if they are in the front of the room, so maybe you could turn your desk around to the other side?

[tINY]

Originally Posted by nixoblivion

Are you sure 125Hz is your problem?
from looking at your room, you should have big problems at 69Hz and 138Hz...

If all the walls are poured concrete and don't flex....

It's probably a combination of factors and the theoretical 138Hz could well tun out to be 125hz when the walls start flexing.



-tINY

[Nordenstam]

The distances from speakers to boundaries seems right for adding up to a pile of constructive early reflections interference around 125 Hz at the sweetspot. Moving the speakers and/or sweetspot may help.

[jhbrandt]

Originally Posted by Lupo

The distances from speakers to boundaries seems right for adding up to a pile of constructive early reflections interference around 125 Hz at the sweetspot. Moving the speakers and/or sweetspot may help.

++1
- jOHN

[vaas]

That's useful info, thanks guys!