
8" DUAL CONE LOUDSPEAKER
AVAILABLE WITH TRANSFORMER
C5A
Series
C5A
SPECIFICATIONS
Size: 8" (203mm) 
Power Handling: 15 Watts program, 10W RMS 
Sensitivity (1W/1M): 96dB Peak, 93dB Average 
Impedance: Nominal, 8 Ohm 
Frequency Response: 50Hz - 18kHz (Nominal), 80 - 9kHz +5dB 
Dispersion: 105˚ (2kHz Octave Band, -6dB Points)  
Diameter & Depth: 8.125" (206mm) Dia. & 2.625" (67mm) Deep 
Mounting Dimensions: 7.625" (194mm) Bolt Circle 
Cone Material: Treated Paper 
Surround Material & Damping: Self Edge 
Flux Density: 9,200 Gauss, .92 Tesla 
Magnet Weight - Nominal: 5 oz., (132g) 
Basket Material:  Stamped Plated 20 ga. CRS 
VC Diameter: 1" (25mm) 
VC Material: Copper 
VC Former Material: Black Anodized Aluminum 
VC Winding Width: .190" 
Top Plate Thickness: .180" 
Weight: 22 oz. (607g)
FEATURES
• Industry Standard Value Loudspeaker with Proven Performance
• Available with Factory-Installed Line-Matching Transformer
• Ideal for Multi-Purpose Commercial, Industrial and Institutional Use
• Mounts a Wide Selection of Atlas Sound Baffles
APPLICATIONS
Utilize Atlas Sound's dual-cone loud speak er for voice transmission, 
music and signal re pro duc tion in commercial, in dus tri al, and in stitu tion al ap pli ca tions. Model C5A is an economical, multi-purpose 
loudspeaker with choice of eight factory-installed line matching transformers to meet a variety of value-conscious project 
requirements. (For more information on Atlas Sound trans form ers, 
see sales sheet #SL1-1369.)
GENERAL DESCRIPTION
Model C5A is a reliable, economically priced 15W loudspeaker that 
offers many features found in speakers costing considerably more. 
It includes a curvelinear, treated-paper cone for lower harmonic 
distortion. It is also equipped with a full 1” diameter copper voice coil 
with a black-anodized aluminum former for better power dissipation.
Model C5A operates within a frequency response range of 50Hz 18kHz with a sensitivity of 96dB and a dispersion angle of 105˚.
It mounts a wide variety of Atlas Sound round and square baffles and 
enclosures to meet functional and aesthetic application requirements.
ONE
THIELE-SMALL PARAMETERS
Pe: 10 Watts 
Fs: 128Hz  
Xmax: .05” 
Resistance: 6.1 Ohms 
Qts: 1.15
SPKR./ 
XFMR.
MODELS
C5AT25 
C5AT70 
C5AT72
INCLUDES
XFMR.
LT-25 25V 
LT-70 70.7V 
LT-72 25/70.7V
 © 2006 Atlas Sound LP  Printed in U.S.A.  00706  ATS002419 RevA 07/06  SL1-1540
Qes: 1.57 
Qms: 4.2 
BL: 5.6 N/A 
Efficiency: 1.3% 
Vas: .35 (ft3)
PRIMARY 
VOLTAGE
100Hz - 10kHz, ±1.5dB .5, 1, 2 & 5 8Ω 1.5dB 
100Hz - 10kHz, ±1.5dB .5, 1, 2, 4 & 5 8Ω 1.5dB 
100Hz - 10kHz, ±1.5dB .5, 1, 2 & 4 8Ω 1.5dB
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. 
TELEPHONE: (800) 876-3333 / FAX (800) 765-3435
Sd: 33.2 (in2) 
Le@1kHz: .26 mH 
MMs: .36 oz. 
Cms: .027 in./lb.
TRANSFORMER SPECIFICATIONS
XFMR. FREQUENCY
RESPONSE
PRIMARY
TAPS 
(WATTS)
SECONDARY
IMPEDANCE
Specifications subject to change without notice
INSERTION
LOSS
CORE
SIZE
1
⁄2" x 5⁄8" (13 x 16mm) 5W
1
⁄2" x 5⁄8" (13 x 16mm) 5W
1
⁄2" x 5⁄8" (13 x 16mm) 4W
AtlasSound.com
POWER 
RATING
73

ARCHITECT & ENGINEER SPECIFICATIONS
Unit shall be Atlas Sound 8" loudspeaker Model ______ or loud speaker/trans form er combination Model ______ (utilizing line-matching transform er Model ______). It shall have a (5 oz.) ceramic magnet and a 
seamless cone. Frequency response range shall be _____________. 
Sensitivity shall be _______. Voice coil shall be black anodized to help 
C5A : Frequency Response
dissipate heat, have an impedance of 8 Ohms and a diameter of 1" 
(25mm). Transformer primary voltage shall be ____ with a frequency 
response range of ____. Insertion loss shall not exceed ____. 
FREQUENCY (Hz)
C5A: Impedance
FREQUENCY (Hz)
C5A : Fundamental vs 2nd & 3rd Harmonic (Raised 20dB)@ 1 watt
Octave Bands Normalized to Zero On Axis
Specifications subject to change without notice
FREQUENCY (Hz)
C5A: Frequency Response Overlay at 0, 15, 30 & 45 degrees
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. 
TELEPHONE: (800) 876-3333 / FAX (800) 765-3435
 © 2006 Atlas Sound LP  Printed in U.S.A.  00706  ATS002419 RevA 07/06  SL1-1540
AtlasSound.com