John Sayers' Recording Studio Design Forum Archive

I'm planning on attaching woodframes containing rockwool to kill flutter echoes in my control room and to create a RFZ.

But...should theese be spaced away from the walls / ceiling or not and should the "diffusors" at the RFZ be angled away from the listening position?

Corners will be treated seperately.

Walls and ceiling are concrete and have a wonderfull reverberation time of aprx. 1 second combined with a nice ringing.

Cheers, Lasso.

Lasso,

I don't really understand the situation you're describing. Do you mean you want to build sort of movable partitions separate from the walls? Can you post a drawing to clarify?

Thanks!
Thomas

Hi again.

No they will be permanenly installed. Actually, I have done them now and ran into something else:

I've installed 12 pieces of rockwool (fibraglass) on my walls in my controlroom. 3 on each side of the listening position and 6 on the rear wall. They measure 1,4 meters (high) and 60 cm (width). The're attached to wood frames with no backing - just a frame. They're spaced 3 cm from the wall.

They're naturally doing a great job killing early reflections but it almost seems to have made the standing waves worse - like they're resonating on their own? Or maybe am I just hearing the room modes better now the reverb has diminished?

So the question is - would I be ok leaving the frames as they are - or should they be closed on the back and have slats attached - and thereby turned into a helmholtz resonator?

I should mention that I haven't done the corner bass traps yet.

Cheers, in a litle panic, Lasso.

Lasso wrote:Hi again.
So the question is - would I be ok leaving the frames as they are - or should they be closed on the back and have slats attached - and thereby turned into a helmholtz resonator?

the answer is YES!!!!!!

You need the diffusers to reflect that sound to the rear of your control room away from your ears AND by making it into a resonator you will create a nice midrange absorber which will tighten up your mids making you hear them coming off the speakers better and making you mix better.

Bryan Giles

giles117 wrote:You need the diffusers to reflect that sound to the rear of your control room away from your ears ....

Diffusers? Do you mean slats?

The slats act as flat reflective surfaces, not diffusers.

Thomas

Thanks for coming back.

I guess I could angle the frames away from the listening position without major trouble.

Now what I can't do, without rebuilding, is to have airspace between the rockwool and the backing. Would that matter much? The resonators, as they turned to be, will still be spaced away from the walls.

Cheers, in a litle less panic,
Lasso.