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PA system for Openair Cinema
PA system for Openair Cinema
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Old 13th January 2020, 01:04 AM   #11
turk 182 is offline turk 182  Canada
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Danley OS80 perhaps? https://www.danleysoundlabs.com/wp-c...Spec-sheet.pdf
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Old 13th January 2020, 03:50 AM   #12
Phenoholic Anonymus is offline Phenoholic Anonymus
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Danley is too expensive as stated in the opening post.
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Old 13th January 2020, 06:37 AM   #13
pelanj is offline pelanj  Czech Republic
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PA system for Openair Cinema
Looking at the price of the 18Sound coax, I think it should be possible to use a 12" coax, maybe something like 12FCX76 and 15" BR subwoofers below that. If there should be any kind of bass, a single 15 coax will not do it. Edit: What is the total budget for speakers and amp(s) excluding the wood work?
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Old 13th January 2020, 10:07 AM   #14
turk 182 is offline turk 182  Canada
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sorry, i missed that!
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Old 13th January 2020, 10:56 AM   #15
chienmort is offline chienmort
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Just use standard PA speakers and put large bin bags over them. I used that for months at a football (soccer) stadium without any problem. You can buy cone water proofing

B&C Loudspeaker Cone Waterproofing Compound - 500ml PS16.61

but that will affect the performance in normal indoor use so the bin bags worked for me in the rainy and windy UK.

Last edited by chienmort; 13th January 2020 at 11:00 AM. Reason: Added link
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Old 13th January 2020, 01:34 PM   #16
Phenoholic Anonymus is offline Phenoholic Anonymus
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Thanks for the bin bag tip!

Budget is between 2.000 euro for L+R + 1 amp and 3.000 for LCR & Sub + amps. The idea is to play outdoors 12 weeks @ 3 nights a week. So lots of setting up and breaking down. Compact, reliable, not to heavy, sound quality as high as possible. System as simple as possible, so others can set it up too.

LCR 15 or 12 inch Coax, -3dB point around 65 Hz for the 15's. Or higher for the 12's.
Sub 2 x 18 vented or single 18 in a horn.
An Oppo Blu Ray player will handle the x-over. And limit subbass excursion for the L+R.

Would be nice if the coax 15's L+R can manage the complete sound. So i have a fallback option if one of the amps or sub in the LCR + Sub system goes poof. Another + for the L+R as 15's would be headroom.

Last edited by Phenoholic Anonymus; 13th January 2020 at 01:44 PM.
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Old 13th January 2020, 01:44 PM   #17
kipman725 is offline kipman725  United Kingdom
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Or a 10" coax? so you think loudspeakers are linear eh!

10HX230: FaitalPRO | Coaxial Loudspeakers | 10HX230

Looks to be able to do your target SPL to 30 m distance as long as you keep the bass away from it. You could cross to a cheap 15" to make a 3 way and have a louder system with better polar pattern than the 18sound driver (especially when you take into account that the majority of sound power is in the lower octaves).
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Old 13th January 2020, 02:08 PM   #18
Phenoholic Anonymus is offline Phenoholic Anonymus
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The short list:

15 inch coax speakers that can handle high spl and bass with a highpass:
18Sound 15NCX750
B&C 15CXN76
Celestion FTX 1530

12 inch coax speakers, that need a sub:
18Sound 12NCX750
B&C 12CX32

2x 18 inch subwoofer ported. Push push. Both woofers opposite to each other to cancel out enclosure noise. Or a single 18 in a (tapped) horn.

The Faital 10HX230 and 12HX230 model well too. But don't come with a stock crossover intended for PA use. The 18 sounds, B&C's and Celestion do. I don't have time to work out a crossover for the Faital's if i want to open this summer.

Last edited by Phenoholic Anonymus; 13th January 2020 at 02:12 PM.
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Old 1st April 2020, 07:41 AM   #19
Phenoholic Anonymus is offline Phenoholic Anonymus
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Still working on permits for the Open-air Cinema. Looks good, there is a chance i can get a bigger plot of land. Thinking of using a 20 feet shipping container as a base for the screen. My questions:

What if i integrate the horn opening in the 20 feet shipping container? Opening in the middle, as close to the ground as possible. Would be nice to know a bit more about pro's and con's.

In bafflestep. Does anyone know of a bafflestep calculator that will handle 20 feet baffles?
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Old 1st April 2020, 09:07 AM   #20
jaddie is offline jaddie
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So...anybody running target SPL vs distance vs speaker efficiency calculations here? More important than the -3dB down point...just sayin....

How/why are you getting maximum SPL at 127dB with a reference of 85dB and 20dB of headroom? Where's the extra 22dB of SPL coming from and why? Trying to hurt people? Get the permit pulled? If it takes 300W to get 105dB (85+20dB), it will take nearly 50kW to get the next 22dB, and nothing, no speaker made...will take that kind of power even if you could afford to deliver it.

Now, returning to earth...

I don't see any reference to seating area, distance from screen, angles...nothing. I also would STRONGLY suggest the center channel right away. Big venue systems do not work in stereo, might as well do dual mono because only the few seats on the center line will get any semblance of stereo. The center channel fixes all of that.

I know picture is off topic, but where are you getting the power to run the 6kW lamp?
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