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Newbie here, need advice on sound placement

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Newbie here, need advice on sound placement

Postby adhesive23 » Tue Nov 19, 2019 9:52 am

Hey everybody. I am new to the forum, and I would love to get your opinion about something. I am not an audio professional, just a music and sound enthusiast, a DJ and event organiser, so excuse any ignorance and a long post

We are throwing a series of parties in a new space, which was a former factory. So think lots of concrete, and hard surfaces. No pillars or anything just clear space. The space itself is 27x20m total size, while the dancefloor would be about 20x20m. Height about 8m. Audience would be around 500-600 people.
So, the whole space is pretty big in volume and because of the surface materials the reverberation is pretty pronounced.

My question is, how would one approach minimizing this, as we are obviously trying to achieve the best sound possible. Going big with the soundsystem, bringing it closer to the listener, placing the speakers in a certain manner, treating or covering the surfaces (this is a bit.difficult for the venue)?

We already rented out a F1 system consisting of 4 x Evo7T and 4 x F221, and already have 2x LD Systems Dave 18 G3 (https://www.ld-systems.com/en/series/da ... -g3?c=2487) which are decent and I was thinking can be used as a reinforcement to the main F1 system.
Assuming the main system would be placed in 2 stacks on sides of the stage, would it be a good idea to place the LD system reinforcements in the back, pointing towards the stage, how would this affect the problem with the reverb for the audience on the floor?

Please, any suggestion is welcome. When doing spaces such as this, what are your tips to acheve the best sound possible with as little reflections as possible. An obvious thing would be to let a local audio specialist deal with this but where I live those are pretty scarce.

Thanks yall

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Re: Newbie here, need advice on sound placement

Postby Sam Spoons » Tue Nov 19, 2019 11:30 am

I would not use the LD Systems pointing towards the stage*, they may be useful as delay satellites** but using such dissimilar speakers in the same rig is probably not going to work well.

It sounds as if acoustic treatment will be difficult or impossible but much greater gains would be made by installing some to control the reverb. That room is probably going to sound bad whatever you do WRT speaker placement.

* Pointing speakers towards each other is never a good idea, it will make the sound in much of the room very poor as most of the audience will hear the same sounds arriving at different times.

** placed part way down the room and time delayed to bring them in sync with the wavefronts from the main rig
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Re: Newbie here, need advice on sound placement

Postby Wonks » Tue Nov 19, 2019 12:26 pm

A proper line-array system will be able to control some of the reverb, as it should stop direct sound being thrown up at the ceiling, which will reduce the reverb level by a decent amount. Whilst the F1 system can be flown arranged in columns, it's not a proper line-array system. But you'd really need to get in a pro-level consultant to pick and arrange the set-up for the PA as it is very specific for each space. It will depend on your budget but a good audio installer/consultant will travel.

A line array system also has the benefit of having a near-cylindrical sound dispersion, rather than a spherical one from a conventional tops+subs arrangement. This means that you need less volume to be decently loud at the back of the room, with a more consistent sound level from front to back. This also helps reduce reverb levels.

Is it possible to hang stuff from the ceiling? If you can hang rectangles or squares of heavy drape material down from the ceiling, maybe add in some coloured flags, that will help with deadening the reverb. Probably far more practical than trying to cover all the walls. I'd have thought you should be able to fix some eye-bolts to the ceiling to hang things from. With an 8m height, you can have pretty long drapes before anyone will notice them much. If they are out of the way, you could hopefully leave them up between events if it's a shared space.

8m ceilings will mean using a scaffolding tower or a small cherry picker to do the above safely.
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Re: Newbie here, need advice on sound placement

Postby AlecSp » Tue Nov 19, 2019 2:57 pm

Wonks wrote:If you can hang rectangles or squares of heavy drape material down from the ceiling, maybe add in some coloured flags, that will help with deadening the reverb. Probably far more practical than trying to cover all the walls.
I know Wonks assumed it's obvious, but let me remind you, any such material *must* be suitably fire retardant, as you want to deaden only the reverb, and not your punters.
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Re: Newbie here, need advice on sound placement

Postby pk.roberts » Tue Nov 19, 2019 8:35 pm

If you can't practically (and safely) treat the space, the most absorbent thing you'll have there will be the bodies. So I would suggest trying to get some height and pointing the speakers down toward the audience. There is info on the F1 site about the dispersion of the speakers, which will give you at lease some idea of where the main energy coming out of them is headed. Think of the speakers as flood-lights and your job is to get an even illumination on the audience with as little light going elsewhere as possible; not a perfect analogy, but it's a start. I thing the DAVE systems would just complicate the issue. maybe just use them as DJ monitors?
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Re: Newbie here, need advice on sound placement

Postby adhesive23 » Thu Nov 21, 2019 2:23 pm

I really appreciate averybody taking the time to give their inputs. That really helped a lot. To summ up:

acoustic treatment is a priority, especially the ceiling. As far as the placement goes, hi mids shoud be higher, pointed down at the bodies. Might be preferable to use a oldschool stack style, getting all the subs at one place in front of the booth. Don't use LD as reinforcement as this might complicate things, perhaps only as a fill at some area away from the main floor, while taking delays into account. Got everyting right?

In your opinion, how far would you place the subs from the back wall so that it disperses properly?
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