Atlas AH94-8ST User manual

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] ©2008 Atlas Sound SL2-3032 ATS002870 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
• 100 watts power handling
• Constant directivity design offers controlled coverage of 90°
horizontal by 40° vertical (2 kHz octave band)
• Driver compliment includes 8” cast frame woofer with a
concentrically mounted 1” exit compression driver coupled to a
90° H x 40° 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 watts 70.7V transformer
• Effi ciency rating of 101 dB (1 W/1 M)
• Maximum output of 121 dB (Rated Power @ 1 M)
Applications
Atlas Sound model AH94-8ST 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 AH94-8ST include a
multiple 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 8" cast frame woofer.
Installation
A heavy-duty stainless steel "C" style mounting bracket is included with
the AH94-8ST 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 AH94-8ST 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, & 60 watts and 8 Ω connection for trans-
former bypass.
AH94-8ST
AH94-8ST
8" 2-Way Stadium Horn System 90° x 40°
AH94-8ST

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] AtlasSound.com 2/4
©2008 Atlas Sound SL2-3032 ATS002870 RevA 1/08
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Technical Specifications
Power Rating: 100 watts
Sensitivity 1 W / 1 M: 101 dB SPL (70 Hz to 17 kHz 1⁄3 octave bands)
Frequency Response: 90 Hz - 15 kHz (±5 dB)
Dispersion: 90° x 40°
Impedance: 8 Ω Nominal
Transformer Taps: 7.5, 15, 30, & 60 watts
Height: 20.05” (509.27 mm)
Width: 19.66” (499.36 mm)
Depth: 19.73” (501.14 mm)
Shipping Weight: 100 lbs (45.36 kg)
Driver Type: 1” HF and 8” LF
Architect & Engineer Specifications
Loudspeaker shall be Atlas Sound Model AH94-8ST or approved equal.
The loudspeaker system shall be a horn-loaded, 2-way design with an 8”
polycone woofer.
The loudspeaker system shall include an 8”, horn loaded, cast frame
woofer and an integral, concentrically mounted 1” exit compression
driver 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 polyswitch protection
circuit for the high-frequency component.
The loudspeaker system shall be capable of providing a sound dispersion
angle of 90˚ horizontal by 40˚ vertical in the 2 kHz octave band.
Rated power shall be 100 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
8” 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 (90 Hz – 15 kHz in 1⁄3 octave bands) mea-
sured at a distance of one meter on axis with a 1 watt input half space
(2.83V).
Overall frequency response shall be 90 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 direct coupled to the speaker for nomi-
nal 8 Ω operation. The system connections shall be protected from the
elements by a screw affixed weather resistant cover.
Dimensions shall be: Height: 20.05” (509.27 mm)
Width: 19.66” (499.36 mm)
Depth: 19.98” (501.14 mm)
Weight: 100 lbs (45.36 kg)
* EIA test spectrum is applied for eight hours.
(This procedure provides a rigorous test of both thermal and
mechanical failure models.)
19.98"
(501.14 mm) 12.03"
(305.56 mm)
20.05"
(509.27 mm)
16"
(406.4 mm)
19.66"
(499.36 mm)
17.91"
(454.91 mm)

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] AtlasSound.com 3/4
©2008 Atlas Sound SL2-3032 ATS002870 RevA 1/08
AH94-8ST Horizontal Beamwidth ( -6 dB)
AH94-8ST Vertical Beamwidth ( -6 dB)
AH94-8ST Frequency Response

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone] AtlasSound.com 4/4
©2008 Atlas Sound SL2-3032 ATS002870 RevA 1/08
AH94-8ST Impedance (ohms) vs. Frequency
AH94-8ST Horizontal Polars (Normalized To Zero On Axis) ( -6 dB)
AH94-8ST Vertical Polars (Normalized To Zero On Axis) ( -6 dB)