Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

You may want to check
http://www.servodrive.com
They do a lot of high power home theater setups. Very good dispersion control.




John A. Chiara
SOS Recording Studio
Live Sound Inc.
Albany, NY
www.sosrecording.net
518-449-1637

In article ,
(Blind Joni) wrote:


Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

SLS 8965
www.slsloudspeakers.com
has pattern control on the vertical to +/- one degree

On Tue, 29 Jun 2004 00:20:51 +0800, john
wrote:

Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

The reason for the scarcity of responses is that the problem isn't
usefully defined. Target area? In front of? etc.

Directivity, as you define it, can only be achieved by being large
compared to a wavelength.

So, to respond, one would need to know what range of pitches you'll
be producing (voice, orchestra, pipe organ, etc.) and some clue about
about the surrouding space.

Follow up and you might well get some good hints. I've always had
good advice from these folks.

Chris Hornbeck

In article ,
George wrote:
In article ,
(Blind Joni) wrote:


Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

SLS 8965
www.slsloudspeakers.com
has pattern control on the vertical to +/- one degree

They overstate the actual pattern control, but even so it's really quite
good. Likewise Alcons makes a somewhat larger box (probably too large for
a 12-foot screen) that has similar control.

As always, the more you can restrict your low end, the more control you
will have.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"Blind Joni" wrote in message


Can anyone help and suggest some loudspeaker with high directivity
for us ? It will be used to serve audiences standing in front of a
12 feet width video projection screen. and we wish it can cause as
little sound as possible outside the target area.

You may want to check
http://www.servodrive.com

They do a lot of high power home theater setups. Very good dispersion
control.

Many of JBL and Community's constant-directivity horns do almost exactly
what their spec sheets say, which nets out to be relatively precise
directivity control.

However, if you want good directivity control in the lower midrange and
working down, it will be a relatively big speaker, and you'll pay for it.

I have a friend who built a HT system out of JBL large-format CD horns, and
it can almost be like wearing headphones. The room is very much out of the
sonic picture. It can also be unbelievably loud but still sound unstrained.

However, if you want good directivity control in the lower midrange and
working down, it will be a relatively big speaker, and you'll pay for it.


The SPL Runts are quite good at this 2x8" and a 1" on the same Unity Horn
setup.


John A. Chiara
SOS Recording Studio
Live Sound Inc.
Albany, NY
www.sosrecording.net
518-449-1637

Blind Joni at wrote on 7/1/04 11:46 PM:


Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

Museums are using these VERY effective overhead plexi domes that use
interesting phase things and the focussed reflectivity of the dome to
restrict sound to the tight 5' or so area underneath the device.

--
John I-22
(that's 'I' for Initial...)
Recognising what's NOT worth your time, THAT'S the key.
--

JoVee wrote:
Blind Joni at wrote on 7/1/04 11:46 PM:

Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

Museums are using these VERY effective overhead plexi domes that use
interesting phase things and the focussed reflectivity of the dome to
restrict sound to the tight 5' or so area underneath the device.

A couple companies make them, including Avitra (www.avitra.com). They
don't sound very good, but they usually don't have to, and they do the
job nicely for exhibit work.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Could you advise some brand names for those "overhead plexi domes" ?
Many Thanks



JoVee wrote:
Blind Joni at wrote on 7/1/04 11:46 PM:


Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.


Museums are using these VERY effective overhead plexi domes that use
interesting phase things and the focussed reflectivity of the dome to
restrict sound to the tight 5' or so area underneath the device.

Can anyone help and suggest some loudspeaker with high directivity for
us ? It will be used to serve audiences standing in front of a 12 feet
width video projection screen. and we wish it can cause as little sound
as possible outside the target area.

Sure. Anything Meyer makes (with the exception of the UPMs) have extremely
defined dispersion. Walk one foot outside of the horizontal pattern & you're
pretty much hearing the room, not the speaker anymore. For this size screen, a
pair of UPA1-Ps would do just dandy if you don't need to throw past about 50
feet. If those are too big, a pair of UPJs would do it, although the horizontal
dispersion falls off more gradually on those.


Scott Fraser