Need some advices for my front walls design

[FRESH-FOX]

Hello @ all.

I built my project studio in the last two weeks as shown in the picture below.

As you can see the front wall (with soffits) is made of a fiberglass filled drywall.

Would it be better to make holes of different size (5 or 8 mm) in the gypsum boards and then cover them with acoustic foam or should I better leave them as they are?

In the space between the frontwall and the slat-resonators I could do some panel Bass traps like shown here:

http://www.bobgolds.com/TrapMartin/home.htm


The door on the back side of the control room I want to cover with fibreglass, in a light angle.

Have you any ideas what I should, could or must do?

Thanx for your help...

Ronny from Dresden / Germany

[cyeazel]

Hey, how's it going? I'm not sure if I'm understanding your question correctly but if you are talking about putting holes into your walls, I wouldn't because it will hurt your sound isolation. I apologize if this isn't what you mean.

[the dreamer]

Hi Ronny, (Na, hast Du das Forum gewechselt? )

Ceazel is right, no holes!

You have a parallel between the door and the window in the booth which is can cause problems.

The slats in the CR should be left and right of the mixposition. Are they?

Look for plans how to build a soffit at the SAE site and here in the forum.
And if you want to decouple your speakers there's mor involved. Need for that?

You dont need to angle the absorberpanels at the backwall/doors. Make them as thick as possible.

How is the front wall assemblied? You basically just want 2 leafs, this kinda look as 2 singlestud walls which would be a nono.

Greetings
Florian

[knightfly]

Panel bass traps work on sound PRESSURE, while absorptive types work on sound VELOCITY - so absorptive traps need to go where the velocity is highest (1/4 wavelength away from boundaries such as wall, ceiling) - Panel traps, because they work on sound PRESSURE, shouldn't be arbitrary in placement because it's easier to put them where they WON'T work than it is to get them RIGHT.

You didn't show an Engineer's position, although the color code is mentioned; but if you're using an equilateral triangle (60 degree monitoring) then the side slat absorbers are probably in the right place. However, those "alcoves" between the deep parts of the slat absorbers and your speaker soffits will likely cause all sorts of wierd reflections.

It also looks like (assuming equilateral triangle again) that the engineer's position may end up dead center of the room, front-to-back - this will NOT be a good thing - here's more

http://www.johnlsayers.com/phpBB2/viewtopic.php?p=18059

When measuring distances, for LF modes such as this IGNORE treatments and measure from hard wall to hard wall... Steve

[FRESH-FOX]

Hi,

thanx for answering my question.

1. I did no holes in the plasterboards at the front - basstraps

2. I did acoustic foam in front of the plasterboard to absorb some of the Early Reflections in the higher frequency spectrum.

3. What about the space between the soffits and the Slat-Resonators at the side walls???? I need your help.

My prefered way to do would be:

put acoustic foam on the side walls between front and Slat resonators. and than hang one bass absorbent panel each side (framed fiberglass panels covered with fabric) about 30 cm in front of the wall.

Better asked: would that configuration do any job there?
I think it all could help to reduce Early Reflections in the front of the Engineers Position (I forgot in my drawing but here it is)

Thank you again for answers...

[knightfly]

Placing FRAMED absorbers at that location would very likely cause high mid/high frequency phase cancellations at the mix position because you would have an early reflection path off the frames that's just slightly longer than the direct path - this could result in some strange sounding comb filter effects at higher frequencies.

If you want to put absorbers there, you would need to do them "frameless" - something like a hard/soft gobo, built by impaling 4" rockwool over a plywood backing board and wrapping the edges and absorbent side with cloth. That should minimise/eliminate those specular reflections off the frame from getting directly back to the mix position... Steve