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#1938336 - 05/06/08 11:38 PM Treating a big concrete high echo room.
norad
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Registered: 05/06/08
Posts: 2

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Hello everybody and hello Ethan
its my first time on these forums,
also english isnt my first language \:\) as i am from eastern europe

i would more then appreciate and consider any helpful opinions and advice. i have very little experinece in the realm of sound and am by profession a graphic designer and part time programmer.

I have allready read the FAQ and some articles and found them extremely helpfull but i thought posting on the forum might help more since the problems i am facing are a bit more custom.


I have a relatively big but low budget venue for arts & new music both electronic (bass heavy) and live bands. There are some severe sound problems i face and no-one with expertise in the area of sound treatment around. Main problems are lack of clarity echo and especially one note boomy awfull bass. I have attached a link to a drawing of the space below:





About the space:
The main room you see is aprox. 45 feet in length and width with a 3 foot solid concrete block for a stage and a raised area to the right also 3 feet high.

The room is aprox 15 feet high and has 1.5 foot beams running on the ceiling from column to column

The floor is extremely thick actual bomb bunker grade concrete. The ceiling is made out of concrete slabs and there are thick columns in the middle and on the sides as shown that support the entire building.

The sidewalls are made out of porours breezeblocks and innerwalls out of thin hollow gipsum.

The space is meant as an upstart venue for new music and artists as well as art shows and such.

We have aquired an active speaker and subwoofer system from RCF - 4pro series with 4 speakers (6001) and 6 subwoofers (4 bassreflex and 2 bandpass.

The speakers are flown on the ceiling and shown on the drawing as yellow rectangles facing inward. The subs are the pink rectangles with the bandpass subs in center. They have been setup this way by the guys we bought them from.

---

After reading your faq i'm not so sure about the placement of the speakers.

As mentioned earlier the problem is both quite the high echo and awfull undistinguishable bass.

Also after reading i am considering installing diy basstraps in the corners with fiberglass/mineral wool ballots stacked as well as alternating panel-traps with fiber traps along the walls where i think the first reflections hit.

Would this be a good ideea ? we really dont have a lot of money and would like to build up the treatment in time.


Thanks to anyone reading and / or offering input.
Have a nice day


Edited by norad (05/06/08 11:41 PM)
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#1938559 - 05/07/08 09:31 AM Re: Treating a big concrete high echo room. [Re: norad]
Ethan Winer Moderator
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Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA

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A room like that needs a large amount of broadband absorption. The cheapest material is fluffy fiberglass or mineral wool. Since the room is so large, and you have little money, just get as much fiberglass or mineral wool as you can afford and wrap it with fabric. You can put some in the corners, but the general goal with large rooms is to spread the absorption evenly around the room. Rather than only in corners, or all on the ceiling etc.

--Ethan
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#1939018 - 05/08/08 04:10 AM Re: Treating a big concrete high echo room. [Re: Ethan Winer]
norad
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Registered: 05/06/08
Posts: 2

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Thank you very much for the advice. I apreciate and will use it. \:\)

We've decided to slowly start placing diy basstraps - and continue to add when we can afford them - starting with basstraps in the corner with mineral fiber and wood panels. and on the ceiling where the first reflections hit.

I also have a question about the speakers and bass -
regarding the speakers - we have a pretty odd space - with paralel walls and the pillars

do you guys think its more important that the speakers be simetrical to the walls (even if one would hit a pillar almost directly) ? or to the stage ?

its harder to just play around with the speakers and move them to see how it sounds better since they have to be flown and hung from the ceiling.
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#1939103 - 05/08/08 07:11 AM Re: Treating a big concrete high echo room. [Re: norad]
Ethan Winer Moderator
MP Hall of Fame Member


Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA

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If your intent is to play stereo music to a group of people, the loudspeakers should be symmetrical from the audience's perspective. So I guess that means to the walls.
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