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The 1000-listeners-sweet-spot project
The 1000-listeners-sweet-spot project
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Old 17th July 2017, 02:12 PM   #11
JonBocani is offline JonBocani  Canada
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You say 1000 people, that's a fair size crowd.
Power. Outdoors you will need LOTS of power. 1000s of watts for "rock show levels". With no walls to contain and reflect to sound, it goes away fast. You know this, of course.
Agreed, 1000 people is a lot. I'd say more around 150-300 people but i'd like to think it could suffice for a larger crowd.
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Old 17th July 2017, 03:03 PM   #12
Pano is offline Pano  United States
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The 1000-listeners-sweet-spot project
OK, thanks for the clarification.

I still don't know it's intended use. At what type of event will you be playing music or other sounds to 150 or more people where there is no power? Maybe a Burning Man or other desert type "happening"?

Although I am now primarily a video guy, I've worked live sound events for over 40 years, many of them outside. The idea of the quick setup and integration is super cool, I just don't understand how or where it would be used.

Oh - stay away from ribbon tweeters for this, unless you plan to replace the ribbons after every show.
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Old 8th August 2017, 05:20 AM   #13
hollowboy is offline hollowboy  Australia
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Originally Posted by JonBocani View Post
Left channel enclosure will be a Mercedes Sprinter 2500 High Roof. Right channel enclosure will be another Mercedes Sprinter 2500 High Roof.
IMO, a trailer would be a lot more $ effective. Building the speakers directly into the van seems like:

1) a waste of a van (over specialisation)
2) a waste of boundary loading (the van is too high up)

Getting 3dB better LF due to ground loading would make your $ go a lot further.

This thread looks useful to you:

Poor Man's Matterhorn

...or stick wheels under something vaguely like this (my horn) Artichoke Horn

To quote weltersys (Art) from that thread:
Using a moderate excursion (around 6MM Xmax) single woofer on a huge straight horn covering 30 to 800 Hz could effortlessly (cleanly) do well in excess of 125 dB at one meter. With four drivers in the 20-100 Hz range you could jack that up by an easy 6 dB, and you would not get "dirty" complaints with 140 dB peaks.
This is also good to clone / milk ideas from:

SynTripP: 2-way 2-part Virtual Single Point Source Horn

Quote:
Originally Posted by JonBocani View Post
fully autonomous, battery-powered, mobile sound system. I'm thinking electric car's refurbished lithium-ion batteries, something that could be recharged in any supercharger station. Worst case scenario: the good old car audio 12vdc plan, but i'd rather have the 36/48vdc lithium-battery way, if doable.
I've seen this done to power a solar cinema here in Australia. The mains were nicely done Unity clones (I might have a photo somewhere), but I don't remember what was used for LF. The power came from a bank of normal deep cycle batteries.

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Originally Posted by JonBocani View Post
subwoofers will be highly inspired by the car audio's SPL drag race era, but reversed this time: back doors opened that acts as a pair of huge horns, probably (hopefully) up to 200-250hz. I'm not exactly sure what will be needed here but probably few dozens of 12/15in drivers per sides.
The LF loading will suffer because the van doors aren't a good seal.

With a simple square box on a trailer, you could give it close-fitting barn doors, and get a lot better loading from them. It'd also be a lot easier to stack mid and HF components on top of a big ply box, than with a van.
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Old 1st September 2017, 10:46 AM   #14
mr. doom is offline mr. doom  United States
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Buy used pa gear, put in van, hire gorilla's to load and unload. Van is horrible enclosure for a 140db system needed for 1000 people.
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Old 5th September 2017, 05:22 PM   #15
Enzo is offline Enzo  United States
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And consider an outdoor concert audience. I suspect they are not sitting in any sort of sweet spot actively listening. Rather I'd wager they were dancing, socializing, etc with the music as a mood setter ambiance. I'd further wager not a one of them will leave the gig saying to a friend, "Did you notice the excellent sound staging? The separation of highs on the percussion was excellent."

many years ago I held annual parties on my 20 acres of farmland. One year I ran 800 feet of power wire out there and hauled a freaking juke box up the hill. By the time the 120v mains got there, the poor thing was running on a little over 90 volts. But the people loved it.

Point being, we don't really need to duplicate symphony hall.
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Old 6th September 2017, 09:00 PM   #16
JonBocani is offline JonBocani  Canada
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Originally Posted by Enzo View Post
And consider an outdoor concert audience. I suspect they are not sitting in any sort of sweet spot actively listening. Rather I'd wager they were dancing, socializing, etc with the music as a mood setter ambiance. I'd further wager not a one of them will leave the gig saying to a friend, "Did you notice the excellent sound staging? The separation of highs on the percussion was excellent."

many years ago I held annual parties on my 20 acres of farmland. One year I ran 800 feet of power wire out there and hauled a freaking juke box up the hill. By the time the 120v mains got there, the poor thing was running on a little over 90 volts. But the people loved it.

Point being, we don't really need to duplicate symphony hall.
unfortunately, you're probably right.

But that applies indoor as well, anywhere, isnt it?
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Old 6th September 2017, 10:52 PM   #17
Enzo is offline Enzo  United States
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Yes, it applies in dance bars, parties, weddings, etc. So in my humble view putting massive effort into the highest of hifi standards is misplaced. You want something that sounds good enough, but is also sturdy and reliable as well as portable.
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