Atlas AH66-12ST User manual

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] ©2008 Atlas Sound SL2-3034 ATS002874 RevA 1/08 AtlasSound.com 1/4
Features
• Heavy duty mounting bracket (included) allows for easy installation to
most any fl at surface
• Three forged eyebolts also included for suspended installation
• 200 watts power handling
• Constant directivity design offers controlled coverage of 65°
horizontal by 65° vertical (2 kHz octave band)
• Driver compliment includes 12” cast frame woofer with a
concentrically mounted 1” exit compression driver coupled to a
65° H x 65° V HF horn
• Easy, weather resistant connection via a convenient recessed
terminal block located on the bottom of the loudspeaker
• Includes a built-in, high effi ciency 60 watt 70.7V transformer
• Effi ciency rating of 101 dB (1 W/1 M)
• Maximum output of 125 dB (Rated Power @ 1 M)
Applications
Atlas Sound model AH66-12ST stadium horn is ideal for directional
sound distribution where full range reproduction, maximum intelligibility,
and high sound pressure levels are required. Applications include football
stadiums, sports arenas, baseball fields, convention centers, and audito-
riums.
Weather resistant construction features of the AH66-12ST include a mul-
tiple screen configuration to prevent moisture from damaging internal
components.
A perforated aluminum screen covers the large horn mouth, a secondary
screen is in place forward of the high frequency driver, and a third tightly
perforated screen protects the 12" cast frame woofer.
Installation
A heavy-duty stainless steel "C" style mounting bracket is included with
the AH66-12ST to allow easy mounting to most any flat surface. Three
drop forge eyebolts are also pre-installed (2-front of horn plus 1-rear for
"pull-up") for suspension mounting via load rated wire rope. (Use caution
when suspending any object overhead. Refer to installation manual for
more details).
The AH66-12ST includes a weather resistant 7 pole terminal block con-
nector on the underside of the speaker for ease of hook-up. This termi-
nal block includes connection points for internal 70.7V transformer with
taps settings of 7.5, 15, 30, and 60 watts and an 8 Ω connection for
transformer bypass.
AH66-12ST
AH66-12ST
12" 2-Way Stadium Horn System 65 x 65
AH66-12ST

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] AtlasSound.com 2/4
©2008 Atlas Sound SL2-3034 ATS002874 RevA 1/08
Technical Specifications
Power Rating: 200 watts
Sensitivity 1 W / 1 M: 101 dB SPL (70 Hz – 17 kHz 1⁄3 octave bands)
Frequency Responce: 80 Hz - 15 kHz (±5 dB)
Dispersion: 65° x 65°
Impedance: 8 Ω Nominal
Transformer Taps: 7.5, 15, 30 &, 60 watts
Height: 23.88” (606.55 mm)
Width: 21.41” (543.81 mm)
Depth: 22.57” (573.28 mm)
Shipping Weight: 130 lbs (58.97 kg)
Driver Type: 1” HF and 12” LF
Architect & Engineer Specifications
Loudspeaker shall be Atlas Sound Model AH66-12ST or approved equal.
The loudspeaker system shall be a horn-loaded, 2-way design with a 12"
paper cone and moisture resistant coating.
The loudspeaker system shall include a 12”, horn loaded, cast frame
woofer and an integral, concentrically mounted 1” exit compression driv-
er coupled to a constant directivity high frequency horn. The three pole
(18 dB/octave) dividing network shall have a crossover frequency of 1.8
kHz. The dividing network shall include a poly switch protection circuit
for the high-frequency component.
The loudspeaker system shall be capable of providing a sound dispersion
angle of 65˚ horizontal by 65˚ vertical in the 2 kHz octave band.
Rated power shall be 200 watts RMS based on EIA Standard RS-426B.*
Enclosure shall be UV-resistant, low pressure injection molded fiberglass
and shall include a 3 stage multiple mesh filter system for weather and
rodent resistance: to include a 20-gauge perforated aluminum screen on
front mouth assembly, a 100 x 100 weave stainless steel mesh between
HF horn and HF driver and a 100 x 100 weave stainless steel mesh over
12” woofer. The loudspeaker shall include a stamped and formed, 2 mm
stainless steel powder coated mounting bracket assembly for surface
mounting and three M8 drop forged eyebolts for suspension mounting
two at the front and one at the rear to allow the speaker system to be
suspended and aimed using rated wire rope.
Sensitivity shall be 101 dB SPL (80 Hz – 15 kHz in 1⁄3 octave bands)
measured at a distance of 1 meter on axis with a 1 watt input half space
(2.83V).
Overall frequency response shall be 80 Hz – 15 kHz (±5 dB).
The input section located on the bottom rear of the loudspeaker shall be
via 7 position screw down terminal strip internally configured to allow
input to an internally mounted 70.7 V transformer with 7.5, 15, 30, & 60
watt taps and a by-pass jumper for direct coupled to the speaker for
nominal 8 Ω operation. The system connections shall be protected from
the elements by a screw affixed weather resistant cover.
Dimensions shall be: Height: 23.88” (606.55 mm)
Width: 21.41” (543.81 mm)
Depth: 22.57” (573.28 mm)
Weight: 130 lbs (58.97 kg)
* EIA test spectrum is applied for eight hours.
(This procedure provides a rigorous test of both thermal and
mechanical failure modes.)
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22.57"
(573.28 mm)
14.65"
(372.11 mm)
23.88"
(606.55 mm)
18.46"
(468.88 mm)
21.41"
(543.81 mm)

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] AtlasSound.com 3/4
©2008 Atlas Sound SL2-3034 ATS002874 RevA 1/08
AH66-12ST Horizonatal Beamwidth ( -6 dB)
AH66-12ST Vertical Beamwidth (( -6 dB)
AH66-12ST Frequency Response

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] AtlasSound.com 4/4
©2008 Atlas Sound SL2-3034 ATS002874 RevA 1/08
AH66-12ST Impedance (ohms) vs. Frequency
AH66-12ST Horizontal Polars (Normalized To Zero On Axis) ( -6 dB)
AH66-12ST Vertical Polars (Normalized To Zero On Axis) ( -6 dB)