Control Room back wall question

Paul-Doug · Post by **Paul-Doug** » Fri Aug 29, 2003 3:09 am

As the design for my basement project studio takes shape this site has been a great resource so thanks to John and all contributors....

My control room design is very similar to Blue Bear's except that my room is about 16ft long to his 19ft. Width is 12'10" and height is 7'10".

So my question is should my back wall be more absorbtive than what Blue Bear has constructed? That slot resonator finish looks great and I assume takes care of bottom end problems but I'm worried about the high-end reflections. Or maybe it's okay because of the angled design....

Thanks,

Paul

giles117 · Post by **giles117** » Fri Aug 29, 2003 3:41 am

The angle of the resonator is to "project" or "Push" the sound that bounces off it towards the rear of the room

So you will be fine where the hi end reflections are concerned.

I would make the rear more abosrptive due to the shorter distance.

The bottom end is not "handled" by the slot resonator, but rather by the rear wall absorption, using hangers in the rear wall and ceiling if possible as well as soffits if you choose to soffit your monitors.

The Slots are more for midrange control.

Bryan Giles

In My room, I used 4" SFB/Rockwool lifted off the back wall and that tamed my bottom end.

Paul-Doug · Post by **Paul-Doug** » Sat Aug 30, 2003 1:11 pm

Okay.... Have I got the right idea in the attached picture?

Blue - bass trap
Red - slot resonator
Green - hi-frequency absorber

Thanks,

Paul

Post by **John Sayers** » Sat Aug 30, 2003 2:16 pm

Hi Paul - firstly I don't think you room is long enough to allow hanger space at the rear. Hangers really take up around 2 - 3 foot depth to be effective.

May I suggest a system I used in a small room that looks like the attached.

The rear wall is angled forward by around a foot so you still retain the full floor area. The blue panels are made from cloth over 2" insulation (that compresses in the process down to 1" ) over 1/2 fibreboard.
See attached drawing.

Yes - have the slots on the side walls as drawn but with out trhe hangers , just using the angle to create the resonator depth.

cheers
john

Paul-Doug · Post by **Paul-Doug** » Sun Aug 31, 2003 1:17 am

Great! I may have room for a couple of chairs at the back of the room, yet!

In the picture I've added slot resonators to the front splayed walls and changed the back wall as per your suggestion (double green line to remind me that it is angled). Hangers remain only in the soffits.

Blue - bass trap
Red - slot resonator
Green - hi-frequency absorber

Will it make a lot of difference if the front splayed walls are not symmetrical? It will be a little more difficult in construction to make them symmetrical because of the door placement but if it will help improve the sound stage then I'll go the extra mile.

Thanks,

Paul

Post by **John Sayers** » Sun Aug 31, 2003 9:32 am

I'd make the front symmetrical and build the door into the angled wall. You could also put a double door system in as well.

cheers
john