16 Mar
2004
16 Mar
'04
11:01 a.m.
I have been asked to work on a large outdoor party again this year.
This time we are going to have multiple zones with powerful equipment.
Can anyone give me some tips on appropriate spacing to enable a good mix
of cleaness and sound fusion?
For example if I have 4 x 20KW systems how far apart from each other
should they be so they don't overpower each other?
--
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
========================================
Apparently upon the beginning of the barrage, the donkey broke
discipline and panicked, toppling the cart. At that point, the rockets
disconnected from the timer, leaving them strewn around the street.
Tethered to the now toppled cart, the donkey was unable to escape before
the arrival of U.S. troops.
United Press International
Rockets on donkeys hit major Baghdad sites
By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM
16 Mar
16 Mar
11:21 a.m.
On Tue, Mar 16, 2004 at 11:54:49 +0900, Patrick Shirkey wrote:
I have been asked to work on a large outdoor party
again this year.
This time we are going to have multiple zones with powerful equipment.
Can anyone give me some tips on appropriate spacing to enable a good mix
of cleaness and sound fusion?
For example if I have 4 x 20KW systems how far apart from each other
should they be so they don't overpower each other?
I dont know how much SPL you get from the equipment, but if you are Xm
from one speaker and X*2m from the other, the nearest one will only be
about 12dB louder.
the inverse square power law gives
difference = (distance from A / distance from B)^2
in dB's 20 * log10(difference);
so to get 40dB's of difference (seems like a reasonable minimum) you have
to be 10x nearer to the nearest stack than the next nearest.
How loud those dB's appear to be depends on what the SPL is, I think you
need more difference with a higher SPL, human ears compress, especially at
high volumes.
Hope that helps,
Steve
11:44 a.m.
Steve Harris wrote:
On Tue, Mar 16, 2004 at 11:54:49 +0900, Patrick
Shirkey wrote:
Definitely
So if a zone is 10 meters a minimum distance between systems would be
100 meters?
Could that be cut down to 50 to provide fusion at the edges of the zones?
--
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
========================================
Apparently upon the beginning of the barrage, the donkey broke
discipline and panicked, toppling the cart. At that point, the rockets
disconnected from the timer, leaving them strewn around the street.
Tethered to the now toppled cart, the donkey was unable to escape before
the arrival of U.S. troops.
United Press International
Rockets on donkeys hit major Baghdad sites
By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM
I have been asked to work on a large outdoor party
again this year.
This time we are going to have multiple zones with powerful equipment.
Can anyone give me some tips on appropriate spacing to enable a good mix
of cleaness and sound fusion?
For example if I have 4 x 20KW systems how far apart from each other
should they be so they don't overpower each other?
I dont know how much SPL you get from the equipment, but if you are Xm
from one speaker and X*2m from the other, the nearest one will only be
about 12dB louder.
the inverse square power law gives
difference = (distance from A / distance from B)^2
in dB's 20 * log10(difference);
so to get 40dB's of difference (seems like a reasonable minimum) you have
to be 10x nearer to the nearest stack than the next nearest.
How loud those dB's appear to be depends on what the SPL is, I think you
need more difference with a higher SPL, human ears compress, especially at
high volumes.
Hope that helps,
Steve
12:23 p.m.
So if a zone is 10 meters a minimum distance between
systems would be
100 meters?
And make sure to place your stations in a hexagonal
closest packing - in this way you can cram in a spectacular
17 percent more stations for a given area and minimum
distance than with a square pattern!
:-)
Dr. Oyvind Hammer
Senior Researcher
PGP - Physics of Geological Processes
University of Oslo
1:08 p.m.
On Wed, Mar 17, 2004 at 12:38:01 +0900, Patrick Shirkey wrote:
So if a zone is 10 meters a minimum distance between
systems would be
100 meters?
Those are very rough rule-of-thumb numbers, but yeah, it sounds plausible
:)
Could that be cut down to 50 to provide fusion at the
edges of the zones?
You could experiment if you set up a set of monitors in a room to scale.
- Steve
2:47 p.m.
On Tue, 2004-03-16 at 09:02, Steve Harris wrote:
On Wed, Mar 17, 2004 at 12:38:01 +0900, Patrick
Shirkey wrote:
Seems to make my EV Tapco powered mixer and Bag End speakers look feable
somehow! :) (God I dont miss the lugging of industrial strength sound
reinforcement)
So if a zone is 10 meters a minimum distance
between systems would be
100 meters?
Those are very rough rule-of-thumb numbers, but yeah, it sounds plausible
:)
Could that be cut down to 50 to provide fusion at
the edges of the zones?
You could experiment if you set up a set of monitors in a room to scale.
- Steve
3:15 p.m.
Patrick Shirkey wrote:
Definitely
So if a zone is 10 meters a minimum distance between systems would be
100 meters?
Could that be cut down to 50 to provide fusion at the edges of the zones?
We used to set up some large outdoor concerts here in California. Don't
forget that there are timing differences based on where people are
standing WRT each set of speakers. If someone is just beyond the second
set they will hear both the main set on stage as well as the set close
to them.
We used to set up all the speakers going in the same direction away from
the stage and then digitally delay the later speakers by 1mS/foot that
the two sets were separated. This worked really well and gave much
better sound in the back of the area we were covering.
I would think this would be very easy with Jack and some little digital
delay app running under Linux.
HTH,
Mark
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6 comments
5 participants
participants (5)
-
Mark Knecht -
Oyvind Hammer -
Patrick Shirkey -
Russell Hanaghan -
Steve Harris