Question about mixing room treatment

[trifidmaster]

Dear Bryan, dear forum members,

Here is a sketch of my room/mixing room.
The measures are in cm.

The walls are plastered bricks (appr. 1 cm thick plaster), the floor is laminate, the ceiling is plastered concrete (appr. 1 cm plaster),
The window is double glass, the door is massive wood.

Q1: I would like to ask you how should I treat it for mixing purposes?

Q2: What decay times are OK for mixing purposes in a studio?
I believe it depends on the frequency.
Could you gens elaborate on this issue, too?

Cheers
Stefan.

[bpape]

Hi Stefan

Face the window for mixing.

Treat the front 2 corners floor to ceiling with chunk style absorbers or at a minimum, 4" thick panels straddling the corners.

2"-3" thick panels directly on the front wall behind the monitors for boundary bass issues (SBIR)

2" reflection panels on the side walls

4" panels on the rear wall centered behind the mix position

Depending on room height, either 3-4" panels overhead to deal with height modes or diffusion if the ceiling is higher.

Decay time does vary across the spectrum depending on room size, room usage, etc. Other things to consider are:

Room construction
Amount and type of furniture
Number of people

In this room for this usage, I'd shoot for about 1/4 second in the 125Hz range gradually tapering down to around 140ms or so by the time you get to 4kHz. What I've described above is general treatment for specific issues and will get you close to this though some additional broadband bass control may be required.

Bryan

[trifidmaster]

Hi Bryan,
Thank you very much.

Should I also consider the 38% sitting rule from the front wall?

Cheers
Stefan.

[bpape]

Generally that's a good place to start but it's not a hard and fast rule. Usually, seated ear position ends up being best somewhere between 33 and 38%

Bryan

[trifidmaster]

Thanks a lot!

What densities should I use for the panels?

[bpape]

If you use 4" straddling for the corners, then I'd use 3-6lb density. If doing the chunks, then 3lb is fine.

Also, once we get this phase done, if you want to potentially do some soffits of some size, a lighter density can be used once you get to about 8" thick or more.

Bryan

[trifidmaster]

Bryan,

Thank you, :-). I will come back as soon works start.
Note: I have approximately 12-14 m long soffit as well - can be installed if needed.

Stefan.

[trifidmaster]

Bryan,

How far should I place the speakers from each other for the start?

Important note: I do not have the Dynaudio sub anymore, and I have changed the speakers/monitor: now I have Dynaudio BM 5A compacts.
The speakers are on stands.

About the software. What should I use?

Stefan.

[bpape]

Use Room EQ Wizard for measurements. Free download here at The Shack.

For spacing, hard to say. You just need to play with it. In general, for nearfield monitoring, you'll want them to be as far or slightly farther apart as you are from them.

Bryan