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#1647467 - 04/04/04 11:44 PM Ceiling bass trap
Terry K
Member


Registered: 04/04/04
Posts: 4
Loc: Sequim Wa

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Ethan,

Hello, new guy here so I hope this isn't too long!

I finished reading your articles on bass trapping and found them a great source of info. Many thanks for that. And the solutions you offer will help greatly in the process of controlling the out of control low end in my
control room. If you don't mind I would like to ask a simple question(s). To do that thought it useful to describe the room and then see if my solutionhas merit or is a waste of time.

Let me give you the least amount of info I think you'll need so I don't spend a great deal of your time reading detail.

I have a small control room adjacent to the tracking room. Both rooms are constructed of 8" filled cinder block walls with stick framed roofs covered in 5/8 drywall.Both walls are within the stick frame construction of the out
structure which is in turn attached to the side of our house. This was an addition to the existing home. The control is small 9.5 x15.5 x 8 - The 8 foot refers to the baseline of the roof. In reality the roof is peaked. It
rises above the monitors to a height of about 2.5 in the center of the room.

The room has been treated in front with some Auralex products 2" foam and some lenrd corner bass traps. There a few diffusers, also auralex, on theside walls and the back wall. The monitors are aligned on the long axis.(Genelec 1030a and Mackie HR824)

After reading your articles I have decided that some further work is ness to achieve the sound controlI am looking for.

Besides (or in addition to) building panel traps, would there be a benefit to opening the ceiling into the space above? By cutting the drywall I expose a huge cavity that is connected to the space above my garage which is half filled with loose blown in insulation. In your article you say most of us don't have the luxury of using big external traps. Would this work? Would it eliminate the need for other traps in the room or is the corners of the rear
of the studio going to continue to create problem. I figure the best spot would be right above the rear wall as that part of the roof angles back toward the front to the room. I could also in addition open a hole over the
monitors. Is this would work how large should the openings be? The openings could be close to 9 feet wide and 4 feet high in both locations. should they be covered with slats or left acoustically open with just a screen cloth?

Anyways that's the idea. I didn't want to give to many details here because keeping it short was a goal.

And of course I would be willing to supply any additional details or questions you might have.

Terry Kennedy
Cerebus Sound
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#1647468 - 04/05/04 03:31 PM Re: Ceiling bass trap
Ethan Winer Moderator
 MP Hall of Fame Member


Registered: 06/12/00
Posts: 5405
Loc: New Milford, CT, USA

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Hi Terry,

> The control is small 9.5 x15.5 x 8 ... Besides (or in addition to) building panel traps <

For a room that size I recommend bass traps based on rigid fiberglass rather than wood panel traps. The panel type makes more sense in a larger room where there's more wall surface. Not that panel traps won't help you, because they will. But for your room you'll get more bang for the buck with porous absorbers mounted straddling the corners.

> would there be a benefit to opening the ceiling into the space above? <

Yes, absolutely!

> Would it eliminate the need for other traps in the room <

No, because that's only one of six surfaces.

> I figure the best spot would be right above the rear wall ... I could also in addition open a hole over the monitors. <

Can you just remove the entire thing? That would be best.

--Ethan
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www.realtraps.com
The acoustic treatment experts

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#1647469 - 04/05/04 05:40 PM Re: Ceiling bass trap
Terry K
Member


Registered: 04/04/04
Posts: 4
Loc: Sequim Wa

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Can you just remove the entire thing? That would be best.

--Ethan[/QB][/QUOTE]

Ethan,

Thanks for the advice.

Remove the entire thing? My entire roof? I suppose I could but it is 15.5 x 9.5 - Are you saying to ripp the sheetrock down and just covered it with acousticlly transparent cloth?

At what percentage of the removing material from the roof does that become a game of dimishing returns?

Terry
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#1647470 - 04/05/04 05:59 PM Re: Ceiling bass trap
Ethan Winer Moderator
 MP Hall of Fame Member


Registered: 06/12/00
Posts: 5405
Loc: New Milford, CT, USA

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Terry,

> Remove the entire thing? My entire roof? <

Unless I misunderstand, you have an outer ceiling - the underside of the roof - that is much higher than the lower sheetrock inside ceiling. So if you remove the entire lower ceiling you'll then be able to look up and see the rafters on the inside of the roof. Yes?

If that's the case, then removing the entire inner ceiling will make the whole room higher. And that's a good thing. You can then climb up there and line the rafters with fiberglass to augment the blown-in insulation.

> At what percentage of the removing material from the roof does that become a game of dimishing returns? <

I don't know, but I can tell you for certain that removing the entire ceiling to make the room higher can only help.

--Ethan
_________________________
www.realtraps.com
The acoustic treatment experts

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#1647471 - 04/05/04 07:24 PM Re: Ceiling bass trap
Andre Vare
Senior Member


Registered: 03/13/04
Posts: 125
Loc: Hamilton, ON Canada

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