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Author Topic: Help with evening out sub in an amphi  (Read 1433 times)

Miguel Dahl

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Help with evening out sub in an amphi
« on: April 23, 2021, 01:26:05 pm »

So, we have a room with amphi seating. I believe it's 14 wide and about 10 high, 20 deep. Meters.

FOH is in the back against the back wall, listening height there is about 4.5m high. Subs are also placed against the back wall, on the floor. 2x 600HP clustered center.

Needless to say, the sub is uneven, FOH which sits on top of the subs is getting massive amounts, and so are the seats in a line in front of the subs.

My first guess is spacing out the subs, but a better option would be to aquire a third sub, to get more lobes, but not as big lobes?

I was also thinking if it's possible to orient the subs in a manner that they are stacked, but with a spacer between them, to try to cancel out some of the energy going vertically, and somewhat semi-horizontally, but since there's a floor underneath, that wouldn't be so easy with the mirroring of that surface from the top sub.

Any takes on this?
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Tim McCulloch

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Re: Help with evening out sub in an amphi
« Reply #1 on: April 23, 2021, 03:26:46 pm »

Fly the subs?
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Miguel Dahl

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Re: Help with evening out sub in an amphi
« Reply #2 on: April 23, 2021, 04:39:46 pm »

Fly the subs?

Not an option, they stay on the ground, in the back..
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Ivan Beaver

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Re: Help with evening out sub in an amphi
« Reply #3 on: April 23, 2021, 04:45:27 pm »

Sub coverage in a room is largely determined by the shape/dimensions of the room.

Often the room modes will dominate.

Why are the subs in the back?

There is no modeling (that I am aware of) that will model subs in 3d with reflections.

So the best thing would be to simply "play" with the placement and walk a lot in the room and make notes as to what and where certain things are happening.  Measurements would be best, but even written notes can help a lot.

Then change position and see if it got better or worse.  Chances are the problems will just move around.  But you might get lucky.

You said flying is out, what else is "out"?
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Miguel Dahl

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Re: Help with evening out sub in an amphi
« Reply #4 on: April 23, 2021, 04:57:04 pm »

Sub coverage in a room is largely determined by the shape/dimensions of the room.

Often the room modes will dominate.

Why are the subs in the back?

There is no modeling (that I am aware of) that will model subs in 3d with reflections.

So the best thing would be to simply "play" with the placement and walk a lot in the room and make notes as to what and where certain things are happening.  Measurements would be best, but even written notes can help a lot.

Then change position and see if it got better or worse.  Chances are the problems will just move around.  But you might get lucky.

You said flying is out, what else is "out"?

They are in the back because there's space for them there, and they don't interfere with anything physical. I could agrument a lot about putting them on the floor on the stage-floor, but I'd be shot down. Visuals. It's a theatre.
What else is out is moving them out from the back wall, since this is a movable amphi, so the seats pull back towards the back wall when needed. Instead of being "stairs" it becomes a vertical wall. At least it can be.

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Chris Hindle

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Re: Help with evening out sub in an amphi
« Reply #5 on: April 24, 2021, 12:22:29 am »

They are in the back because there's space for them there, and they don't interfere with anything physical. I could agrument a lot about putting them on the floor on the stage-floor, but I'd be shot down. Visuals. It's a theatre.
What else is out is moving them out from the back wall, since this is a movable amphi, so the seats pull back towards the back wall when needed. Instead of being "stairs" it becomes a vertical wall. At least it can be.
Build them into the walls either side of the stage?
I generally wouldn't suggest under the stage...
Can they be flown above the stage, behind the mains?
Chris.
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Chris Grimshaw

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Re: Help with evening out sub in an amphi
« Reply #6 on: April 24, 2021, 03:27:20 am »

There is no modeling (that I am aware of) that will model subs in 3d with reflections.


You need to look at specialist acoustic software, rather than stuff for PA systems. Odeon comes to mind, but there are others. The acoustic software is pretty impressive, and the demos are free to mess around with.

Chris
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Miguel Dahl

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Re: Help with evening out sub in an amphi
« Reply #7 on: April 24, 2021, 07:54:34 am »

Build them into the walls either side of the stage?
I generally wouldn't suggest under the stage...
Can they be flown above the stage, behind the mains?
Chris.

The cost of remodeling the "house" would be tremendous, it's not an option. Flying them is also not an optin since again, cost, and there's no room for them under the ceiling. It's packed with what I don't know the english term for, but "single-pole-trusses" which they hang theatre-stuff in. The subs stay underneath the seating, so I have to work with that scenario.
« Last Edit: April 24, 2021, 07:58:16 am by Miguel Dahl »
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Miguel Dahl

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Re: Help with evening out sub in an amphi
« Reply #8 on: April 24, 2021, 08:00:30 am »

You need to look at specialist acoustic software, rather than stuff for PA systems. Odeon comes to mind, but there are others. The acoustic software is pretty impressive, and the demos are free to mess around with.

Chris

Odeon:

Limitations in the Free trial
New/own geometries can only be displayed in 3D view mode. The free demo version does not allow to calculate any acoustical results on new/own geometries.

Measurement results are only displayed for the 1000 Hz band.
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Kevin Graf

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Re: Help with evening out sub in an amphi
« Reply #9 on: April 24, 2021, 08:02:42 am »

Do the old audiophile trick:
Place the sub in the middle of the audience area, then walk around possible sub placement areas and listen for the best sound.
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Speedskater

ProSoundWeb Community

Re: Help with evening out sub in an amphi
« Reply #9 on: April 24, 2021, 08:02:42 am »


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