First room treatment ever, advice?

[Syncamorea]

Please post the room dimensions including the height. The sketch makes it look pretty square. If that's correct, I would consider facing the windows. I don't understand what the "hollow" is you speak of.

Having a large surface of glass on one side is a concern for sure. The first reflection on your left will be very different from that on the right. Plan on building or buying quite a bit of bass traps.

[lunatic_77]

The Room is 5x5 meters in dimension, the height is 2,5 meters. I can not build in front of the windows, because this would cover all heaters and it gets quite cold here in germany. I was thinking about covering the middle window though.

By hollow i mean that the wall is empty inside, so i will take of the inner housing, fill the cavity with rockwool and put it back on, before movind the record shelf to this wall.

[Glenn Kuras]

If I understand you right, filling the wall is not going to do much for the room acoustics unless you plan on filling it with rockwool then put only fabric (or a slate design) in front of it.
Basically you want to bass trap as many corners as possible, cover early reflection points and use THICK absorption for the back wall.
The Basics of Room Acoustics: Bass Traps, Diffusion, Panels - GIK Acoustics

[Jens Eklund]

I would first try and face the windows (speaker right up against them) or possibly the opposite wall assuming you can accept to cover the windows (completely or at least partially at the important area) with treatment (broadband absorption or diffusion + low frequency absorption, depending on design concept):

4m x 5m x 2.5m room - modal resonance problem

[Glenn Kuras]

Originally Posted by Jens Eklund

I would first try and face the windows (speaker right up against them) or possibly the opposite wall assuming you can accept to cover the windows (completely or at least partially at the important area) with treatment (broadband absorption or diffusion + low frequency absorption, depending on design concept):

4m x 5m x 2.5m room - modal resonance problem

Plus one

[lunatic_77]

I don't want to face the windows, because this will totally block the heating. The place is an old office building and most people there don't use the heater at all. This makes it quite hard to get acceptable temperatures in my room.

As suggested i might cover one window totally, maybe even two of them. Is there a way i could make this work with the current orientation?

[Glenn Kuras]

Originally Posted by lunatic_77

I don't want to face the windows, because this will totally block the heating. The place is an old office building and most people there don't use the heater at all. This makes it quite hard to get acceptable temperatures in my room.

As suggested i might cover one window totally, maybe even two of them. Is there a way i could make this work with the current orientation?

It still will work but might not be as well as facing the window. If anything I would flip to the left wall.

[lunatic_77]

Hey Everybody, thanks very much! I now have bulit my new desk facing the windows and it was a very good choice! The acoustic already is a lot better and more homogenic.

Next will be then wall behind me, which will get filled with rockwool and get a fabric cover. I will post fotos with some more questions soon. Until then have a look at my new desk

[avare]

Originally Posted by lunatic_77

Hey Everybody, thanks very much! I now have bulit my new desk facing the windows and it was a very good choice! The acoustic already is a lot better and more homogenic.

Next will be then wall behind me, which will get filled with rockwool and get a fabric cover. I will post fotos with some more questions soon. Until then have a look at my new desk

Congratulations and thank you for the update!

Andre

[Jens Eklund]

Originally Posted by lunatic_77

Hey Everybody, thanks very much! I now have bulit my new desk facing the windows and it was a very good choice! The acoustic already is a lot better and more homogenic.

Originally Posted by lunatic_77

Next will be then wall behind me, which will get filled with rockwool and get a fabric cover. I will post fotos with some more questions soon. Until then have a look at my new desk

If you’re not afraid of a relatively dry response, this might be a good option but I would first recommend to do some measurements before deciding on treatment so you know about your modal issues. You room is big enough for alternative options other than broadband absorption only:

1D diffusor - vertical or horizontal?

[lunatic_77]

Thanks guys! I do not have a lot of space left, take a look at the drawing in my first post.

What I want to do in any case is broadband absorption with rockwool behind me. I also have 1x1,5 meters basotect field, that is going to hang above my position on the desk. As well i will build two bass traps for the corners behind my working space.

I think the records already do a quite good job as diffusors and I will not have any space on walls left after installing what i have planned...

[lunatic_77]

So, i have measured the room. Unfortunately i do not have the frequency responses with me on my holiday, but i hope you guys can help anyways. The curve looks quite alright, but i have a few (audible) issues. First, i get a big peak (+12dB) at about 70Hz. Before (65 dB) and after (85dB) the curve goes down about 10 dB. I have found how to build specific traps for those frequencies, but i don't think I'll have space for two big things...

On the other hands i get a lot of phasing in the upper spectrum. My idea is to sort this with basotect absorbers above my mix position and a bradband absorption on the wall behind me. Will this help? This is how the studio is set up by now:


The Room Size is: 5.25 x 5.25 Meters, height: 2.93 Meters. The shelves on the left and right are stacked Ikea Expedit. Height on the window side: 2.5 meters and on the wall side: 1,85 meters.

[Syncamorea]

How tall are your record shelves? The wall/ceiling corner is a good place to trap with a big soffit if your vertical corners can' be trapped.

[lunatic_77]

I have added the heights of room and shelves! I'll also have some space on the back of the room where the couch is. Behind this I plan to do broadband absorption (will this help with the phasing?) and above that, there could be room for a trap on the whole width of the room. Anyways, I think a non frequency specific basstrap will not help a lot, right?

[Syncamorea]

Originally Posted by lunatic_77

Anyways, I think a non frequency specific basstrap will not help a lot, right?

Broadband is better than nothing. Also look at VPRs.

[lunatic_77]

Originally Posted by Syncamorea

Broadband is better than nothing. Also look at VPRs.

Sorry for being such a noob, but what are VPRs?

[Syncamorea]

My Experiment with a Metal Panel Absorber

[avare]

Originally Posted by lunatic_77

So, i have measured the room. Unfortunately i do not have the frequency responses with me on my holiday, but i hope you guys can help anyways. The curve looks quite alright, but i have a few (audible) issues. First, i get a big peak (+12dB) at about 70Hz. Before (65 dB) and after (85dB) the curve goes down about 10 dB. I have found how to build specific traps for those frequencies, but i don't think I'll have space for two big things...

On the other hands i get a lot of phasing in the upper spectrum. My idea is to sort this with basotect absorbers above my mix position and a bradband absorption on the wall behind me. Will this help? This is how the studio is set up by now:


The Room Size is: 5.25 x 5.25 Meters, height: 2.93 Meters. The shelves on the left and right are stacked Ikea Expedit. Height on the window side: 2.5 meters and on the wall side: 1,85 meters.

Where is your listening position vertically and front to back?

Andre

[Glenn Kuras]

Just scanned the thread real quick so sorry if this has been said, but you need to make sure to treat early reflection points, left, right wall and ceiling. I know you have the book shelf in the way but maybe hang panels in front of take out the records out of a few of the shelves and fill them with fiberglass.
Video Early or First Reflection Points - GIK Acoustics

[lunatic_77]

Originally Posted by avare

Where is your listening position vertically and front to back?

Andre

Right in front of the desk, where the keyboard is!

[avare]

Originally Posted by lunatic_77

Right in front of the desk, where the keyboard is!

Arrgh! Dimensions!

Andre

[lunatic_77]

Originally Posted by Glenn Kuras

Just scanned the thread real quick so sorry if this has been said, but you need to make sure to treat early reflection points, left, right wall and ceiling. I know you have the book shelf in the way but maybe hang panels in front of take out the records out of a few of the shelves and fill them with fiberglass.
Video Early or First Reflection Points - GIK Acoustics

Hey Glenn, thanks! I was thinking the records do a good job as diffusers. To fill a few shelves with fiberglass/rockwool though is a good suggestion!

[Glenn Kuras]

Originally Posted by lunatic_77

Hey Glenn, thanks! I was thinking the records do a good job as diffusers. To fill a few shelves with fiberglass/rockwool though is a good suggestion!

A book shelf "might" be better then a bare wall but it really does not diffuse in the true sense. Also for the early reflection points diffusion is generally not recommend. You want to kill those points the best you can. See the following about diffusion.
How Diffusion Works - GIK Acoustics

[lunatic_77]

Originally Posted by avare

Arrgh! Dimensions!

Andre

Sorry! I can only say it roughly as i am on holiday. The illustration is on scale though.

Vertically at 2.6 meters (so in the middle) and 3,6 meters from the back wall. So it is about 1.6 meters from the window.

[lunatic_77]

So here is what the frequency response looks like! I would be very happy for suggestions on how to remove those valleys in the 50 and 80Hz range.