control room project

  • Thread starter Thread starter Bob Mould
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Bob Mould

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Hi guys! (and girls?)

Im finally going to do something about my so called control room, and i was hoping to get some advice from you guys. Its a 5,34 x 4,2 meter room with a 2,41m high ceiling(thats 17,5x13,8x7,3feet). Concrete and brick walls all around except the wall facing the studioroom which is a normal stud plasterwall. I've calculated my problem frequencies to be in the range 50hz to 300hz. I've studied Johns manual and from that i think i got a pretty decent plan. Speakers will be soffit mounted with the cavity underneath will be used as a bass trap (acoustic hangers). Also i will put in new angled ceiling in there.

My questions are:
Am i on the right track here?

Have i put too much low-mid frequency absorbtion in the plan, could i do with less?

Im a little unsure about the rear corner basstraps, first the angle in which they would be open to the room may be to small?Second: is there a way to calculate the frequencies acoustic hangers will absorb?


Here's the basic building plan.
http://hem.bredband.net/b108258/controlroom.pdf

the calculated modes
http://hem.bredband.net/b108258/Modes.pdf

a pic of the control room
http://hem.bredband.net/b108258/controlroom.jpg

a pic of the studio room
http://hem.bredband.net/b108258/studio.jpg

i would really apreciate your comments on this plan before i start building. Especially if John could pitch in with a little wizdom.

thanks
/mike
 
Hi Mike - yes you are in the right direction. I wouldn't have the slots across the rear wall. I'd just have rigid fibreglass lifted off the wall following the shape you have but without the slots on it.

cheers
JOhn
 
Thanks John!

I'm gonna follow your advice on the fibreglass. But out of couriosity i must ask u the reason for not having the rear walls slot resonators. Many plans ive seen have hade slots at the rear wall? Why is this not a good idea?
updated plan
http://hem.bredband.net/b108258/controlroom.pdf


Many thanks

/mike
 
Last edited:
OK - as I've said in my manual at SAE I don't recommend to many bright surfaces behind you in a small room because the rear reflections are too short and confuse the stereo image at the mixing position.

Sure I've put slots on the rear wall of Guruland etc but the room is over 6 meters (20 ft+) long. In this situation the rear reflections are longer and stop the rear of the room from being dull cos of no highs.

In a small room this is not a problem as you are close enough to the main speakers.

cheers
JOhn
 
Ok!

I see, thats what i suspected. Just wanted to be sure.

Big thanks to you John for all your help!!
 
John Sayers says:
OK - as I've said in my manual at SAE I don't recommend to many bright surfaces behind you in a small room because the rear reflections are too short and confuse the stereo image at the mixing position.
Click to expand...

John - This discussion brings up two questions: I understand your point, but what is "too short"? Mikes room is almost 18 ft long compared to 20+ for Guru. Mine is much shorter (~13ft) and I had been planning on rear wall slot resonators but now am reconsidering.

Secondly, looking at Joe Egans studio, the slot resonators seem to have very wide spacing as compared to what I've seen you do and from running numbers on the calculator. Are these really doing something else?

Cheers
Kevin.
 
My question is, if the room is only 7 feet high, how much slope can you get on the ceiling before you have to learn to walk on your knees? Or, are you only going to slope the 1/3 over the mix desk?
 
I've calculated that if i go for 6 degrees slope the lowest point would be 2.02m (6.6273feet) at the rear wall so you have to be pretty tall before the ceiling height becomes a big problem. I would like to go for 12degrees slope but that wouldnt work with my ceiling height. I was thinking that 6degrees would be better than nothing, am i thinking wrong here?
Any suggestions would be highly appreciated..

here's a rough ceiling plan
http://hem.bredband.net/b108258/ceiling.pdf


thanks mike
 
longsoughtfor - well at 5.34m that's close to around 16ft. Once you build the speakers in it gets shorter. I suppose I'm saying that with his room and the side wall slots he has enough.

There are slots on the rear of Left Bank which is 6m (18+) but not across the whole rear wall.

BTW Egan's studio has 5" and 6" panels over a 12" - 16" depth with what looks like 1/2" - 1" gaps which works out to around 300hz low mids to me. That room is probably longer than Guruland also.

cheers
John
 
John Sayers said:
Hi Mike - yes you are in the right direction. I wouldn't have the slots across the rear wall. I'd just have rigid fibreglass lifted off the wall following the shape you have but without the slots on it.

cheers
JOhn
Click to expand...



Is it possible to use the cavity behind the lifted fibreglass wall for acoustic hangers aswell making the wall both high and low frequency absorbing?

Thanks
Mike
 
well a hanger section is very much like rigid fibreglass off the wall as far as the highs go, it's just more efficient in the low end.

cheers
JOhn
 
John Sayers said:
longsoughtfor - well at 5.34m that's close to around 16ft. Once you build the speakers in it gets shorter. I suppose I'm saying that with his room and the side wall slots he has enough.

There are slots on the rear of Left Bank which is 6m (18+) but not across the whole rear wall.

BTW Egan's studio has 5" and 6" panels over a 12" - 16" depth with what looks like 1/2" - 1" gaps which works out to around 300hz low mids to me. That room is probably longer than Guruland also.

cheers
John
Click to expand...

Umm, not to step on Bob's (Mike's) thread here, but what would you do if the control room was 20'-6" long, and 21'-1" wide at the rear? :)
 
construction has started!!!
the front wall and speaker boxes are almost done,seems to turn out really good.
Thanks alot for all help!!!

I have another question that i forgot to ask regarding Acoustic hangers.
Does the cavity they're placed in need to be airtight?

thanks
mike
 
No it doesn't Bob - not in the same way a slot resonator cavity does.

cheers
John
 
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