Specifications subject to change without notice
© 2002 Atlas Sound Printed in U.S.A. 001102 ATS001454 RevA11/02 SL1-2025
2.47
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 W/ BAFFLE
GD87W
FEATURES
• Industry standard 8" (203mm) coaxial, 16 watt, loudspeaker with
high quality factory installed 8 watt line matching transformer and
white CRS baffle
• Offers proven performance with wide frequency response
• Post-mounted tweeter adds strength and a more attractive appearance
• Ideal for multi-purpose commercial, industrial, and institutionals use
• Individually packaged for stocking & ordering convenience
APPLICATIONS
Use Atlas Sound 8" (203mm) dia., multi-purpose, coaxial loudspeaker
Model GD87W for voice transmission, music and signal reproduction
in high-quality commercial, industrial and institutional applications.
GENERAL DESCRIPTION
The speaker used in the GD87W 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
C803A Series in the past will know exactly what to expect when they
use the GD87W.
High-quality, 25 watt Model GD87W utilizes a post mounted tweeter
which adds strength to the assembly and provides an attractive
appearance. This coaxial loudspeaker features a 55Hz-15kHz ±5dB
frequency response and a broad, uniform dispersion pattern of 90° @
2kHz. Such provisions allow for highly intelligible sound reproduction
and better distribution for high-quality sound systems. The GD87W
combines a full-size 8" (203mm) dia. low-frequency reproducer and a
3" (76mm) high-frequency reproducer. The two sections are coupled
via a built-in crossover network. The woofer has a 10oz. (260g)
ceramic magnet; the tweeter has a 2.35oz. (67g) ceramic magnet.
The unit has an average sensitivity of 96dB (1W/1M). The loudspeaker
is matched with a high efficiency 8 watt 70.7V transformer with a maximum insertion loss of 0.6dB. This premium transformer is constructed
of audio grade laminations and has a full range frequency response of
+1dB from 50Hz-15KHz. The primary taps are 1, 2, 4, and 8 watts.
The GD87W includes a factory installed CRS baffle with concealed
loudspeaker mounting studs and includes screw mount hardware. The
baffle finish is white powder coat epoxy.
ARCHITECT & ENGINEER SPECIFICATIONS
Unit shall be Atlas Sound 8" diameter. loudspeaker/transformer/bafflecombination Model GD87W The low-frequency reproducer cone shall be
a full 8" (203mm) in diameter and the high frequency reproducer cone
shall be 3" (76mm) in diameter. The woofer shall have a 10oz. (260g)
ceramic magnet; the tweeter shall have a 2.35oz. (67g) ceramic magnet.
The two reproducer sections shall be coupled through a built-in
crossover network. The crossover frequency shall be at 2800Hz.
Frequency response range shall be 55Hz-15kHz ±5dB. Average
sensitivity shall be 96dB (1W/1M). Low frequency voice coil diameter
shall be 1" (25mm) and operate in a magnet field of at least 10,600
gauss. Transformer primary voltage shall be 70.7V with a frequency
response range of ±1dB-50Hz-15KHz and power taps at 1,2,4 & 8 watts.
Insertion loss shall not exceed .6 dB. Unit shall include factory installed
CRS baffle. Baffle shall included welded speaker mounting studs and all
necessary hardware to match the baffle to associated optional hardware.
Baffle overall diameter shall not exceed 12
1
⁄4” (324mm) Baffle shall be fin-
ished in white powder coat epoxy. The maximum depth of the loudspeaker/transformer/baffle package shall not exceed 2.875" (73mm).
The GD87W baffle features standard mounting holes to accommodate
the majority of Atlas Sound 8" tile bridges, mounting rings and enclosures.
When specifying mounting hardware be advised that the dimensions of
the GD87W baffle match the Atlas Sound Model 62-8.
GD87W SPECIFICATIONS
Size 8” (205mm)
Power Handling 25 Watts Peak, 15 Watts RMS
Sensitivity 96dB Average
Impedance 8 Ohms Nomina
Frequency Response 45 Hz-19 kHz Nominal, 55 Hz-15 kHz ±5dB
Dispersion 105° (2 kHz 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, 10 oz. (260g)
Basket Material Stamped Plated 20 ga. CRS
VC Diameter 1” (25mm)
VC Material Copper
VC Former Material Black Anodized Aluminum
VC Winding Width .225”
Top Plate Thickness .239”
Weight 32 oz. (908g)
THIELE-SMALL PARAMETERS
Pe 15 watts
Fs 125 Hz
Xmax .05”
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 .36 mH
Mms .39 oz.
Cms .024 in./lb.
Transformer Specifications
Frequency Response 50Hz-15kHz (±1dB)
Primary Taps (Watts) 1, 2, 4 & 8
Secondary Impedance (ohms) 4 & 8
Maximum Insertion Loss .6dB
Primary Termination 6" (152mm) Com. Lead Color Coded
Core Size 1
" x 3⁄4"
(25 X 19mm)
Power Rating (Watts) 8
GD87W
(Front View) (Rear View)
Specifications subject to change without notice
© 2002 Atlas Sound Printed in U.S.A. 001102 ATS001454 RevA11/02 SL1-2025
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)
GD87W Frequency Response
(Transformer Bypassed)
GD87W Impedance
(Transformer Bypassed)
Frequency Hz
Frequency Hz
dB Pa
Ohms
dB Pa
Frequency Hz
2nd Harmonic
3rd Harmonic
* (C) Speaker mounting stud pattern.
** (D) Baffle mounting hole pattern.
▲
EQ81 tile bridge works only with 96-8 Series enclosures.
Side ViewFront View
GD87W BAFFLE INFORMATION
DIMENSIONS MOUNTS OPTIONAL
MODEL DIA.(A) PROJECTS (B) (C)* (D)** ENCLOSURE (OR) MTG. RING TILEBRIDGE
GD87W 12
3
⁄4"
1
⁄4"7
5
⁄8"11
1
⁄4"
(EZ )95-8 Series, T95-8 Series,
75-8(E1)(E2), 81-8R(S)
(324mm) (6mm) (194mm) (286mm) EZ96-8, CS95-8(NS), 76-8(E1)(E2),
199-8, Q408, 96-8 Series
▲
P77-8, P78-8 EQ81s
▲
GD87W OCTAVE BAND POLARS
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