Atlas IED SD72 User Manual
FEATURES
• 10oz dual cone speaker provides familiar response & performance
• Quality 5 watt-dual voltage transformer
• Individually packaged for stocking & ordering convenience
APPLICATIONS
The SD72 is an aggressively priced, high quality speaker/transformer
package suitable for most any paging or background application including retail stores, restaurants, schools and other institutional facilities.
GENERAL DESCRIPTION
The speaker used in the SD72 is the next generation of Atlas high performance cone loudspeakers, very similar to the preceding
C-Series speakers. The similarity in the sonic qualities ensures that
contractors and designers who have worked with the Atlas Sound
C-Series in the past will know exactly what to expect when they use the
SD72. Model SD72 is a dual cone, 25 watt 8" (205mm) loudspeaker
with a 10oz. (260g) ceramic magnet. It includes a curvelinear, treated
paper cone for lower harmonic distortion. The loudspeaker is also
equipped with a full 1" diameter copper voice coil with a black anodized
aluminum former for better power dissipation. Model SD72 operates
within a frequency response range of 45Hz to 19kHz (nominal) with a
sensitivity of 97dB and a dispersion angle of 105°. Package includes
factory installed 25/70.7V line matching transformer with tap selections
ranging from .25 to 5 watts. It mounts a wide variety of Atlas Sound
round and square baffles and enclosures to meet functional and aesthetic application requirements.
ARCHITECT & ENGINEER SPECIFICATIONS
Unit shall be Atlas Sound 8" loudspeaker Model SD72 utilizing line
matching transformer. It shall have a (10oz.) ceramic magnet and a
seamless cone. Frequency response range shall be 45Hz-19kHz
(nominal). Sensitivity shall be 97dB 1W/1M. Voice coil shall be black
anodized aluminum to help dissipate heat, have an impedance of 8
ohms and a diameter of 1" (25mm). Transformer primary voltage shall
be 25V/70.7V with a frequency response range of 100Hz-10kHz
(±1.5dB). Insertion loss shall not exceed 1.5dB.
All models feature standard mounting holes to accommodate the
majority of Atlas Sound 8" baffles. All mounting screws are included
in the package.
Specifications subject to change without notice
© 2002 Atlas Sound Printed in U.S.A. 001102 ATS001450 RevA 11/02 SL1-2021
2.39
One
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: (800) 876-3333 / FAX (800) 765-3435
AtlasSound.com
8" PREASSEMBLED SPEAKER PACKAGE
SD72
SD72 SPECIFICATIONS
Size 8" (205mm)
Power Handling 25 Watts Peak, 15 Watts RMS
Sensitivity 97dB Average
Impedance 8 Ohms Nominal
Frequency Response 45Hz-19kHz Nominal, 55Hz-8kHz ±5dB
Dispersion 105° (2kHz Octave Band, -6dB Points)
Diameter & Depth 8.125” (205mm) Dia. & 2.875” (73mm) Deep
Mounting Dimensions 7.625” (194mm) Bolt Circle
Cone Material Treated Paper
Surround Material & Damping Damped Self Edge
Flux Density 10,600 Gauss, 1.06 Tesla
Magnet Weight Nominal, 10oz. (260g)
Basket Material Stamped Plated 20ga. CRS
VC Diameter 1" (25mm)
VC Material Copper
VC Former Material Black Anodized Aluminum
VC Winding Width .225"
Top Plate Thickness .239"
Weight 32oz. (908g)
THIELE-SMALL PARAMETERS
Pe 15 watts
Fs 12Hz
Xmax .03"
Resistance 7.3 ohms
Qts 0.8
Qes 0.95
Qms 5.2
BL 7.9 N/A
Efficiency 1.90%
Vas .32 (ft3)
Sd 33.2 (in2)
Le@1kHz .36mH
Mms .39oz.
Cms .024 in./lb.
Transformer Specifications
Frequency Response 100Hz-10kHz (±1.5dB)
Primary Taps (Watts) .25, .5, 1, 2, & 5
Secondary Impedance (ohms) 8 Ohms
Maximum Insertion Loss 1.5dB
Primary Termination 6" (152mm) Com. Lead Color Coded
Core Size
1
⁄2" X 5⁄8" (16 X 16mm)
Power Rating (Watts) 5
SD72
(Front View) (Rear View)
Specifications subject to change without notice
© 2002 Atlas Sound Printed in U.S.A. 001102 ATS001450 RevA 11/02 SL1-2021
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: (800) 876-3333 / FAX (800) 765-3435
AtlasSound.com
Fundamental
Fundamental vs. 2nd & 3rd Harmonics
(Transformer Bypassed)
SD72 Frequency Response
(Transformer Bypassed)
SD72 Impedance
(Transformer Bypassed)
Frequency Hz
Frequency Hz
dB Pa
Ohms
dB Pa
Frequency Hz
2nd Harmonic
3rd Harmonic
SD72 OCTAVE BAND POLARS
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