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CONNECTION TO AMPLIFIER
Exercise special care in removing the back cover of explosion-proof driver enclosure, (Part 1) to avoid dam-
aging machined surfaces. Prior to re-assembly, make certain that joining surfaces of enclosure is free of dirt.
Tighten all cover bolts completely. To provide the specified protection in hazardous locations, please note
that no compound of any type is to be applied on machined flange.
INSTALLATION OF MATCHING TRANSFORMER
Atlas Sound Model T-18, 60 Watt line matching transformer is listed by UL and C.S.A. for installation within
the explosion-proof driver enclosure.
Primary Winding: 2000/1000/500/250/125/85/ (45 Ohms)
Secondary Winding: 4, 8 & 16 Ohms
Insertion loss: Less than
1
⁄2dB at 1 kHz
Termination: Solder Lugs
Shipping Weight: 1.5 Lbs.
Within the explosion-proof housing, on the back side of the magnetic assembly of the drive unit, two holes
are pre-drilled for fastening the T-18 line matching transformer with 8-32 screws.
When used with the Atlas Sound HLE-Series speakers, the 16 Ohm secondary winding of the transformer
should be connected to the voice coil leads of the driver.
The following illustrates impedance taps and power selection for connection of the primary winding of the
transformer to the output of the communications system amplifier.
NOTE:
C.S.A. reference guide: 386-0-0.8 Class: 2268
HLE-1(T), HLE-2TC/ HLE-2C
HLE-3C/ HLE-3TC/ HLE-3(T)
IMPEDANCE TAP, OHMS 70 V. LINE, WATTS 25 V. LINE WATTS
45 – 15.0
85 60.0 7.5
125 40.0 5.0
250 20.0 2.5
500 10.0 –
1000 5.0 –
2000 2.5 –
a
Specifications are subject to change without notice
www.AtlasSound.com
1601 JACK MCKAY BOULEVARD ENNIS, TEXAS U.S.A. • TELEPHONE: (800) 876-3332 • FAX: (800) 765-3435
©2001 ATLAS SOUND LP Printed in U.S.A. 00801 ATS000707 RevB 8/01 PN 316972
INSTALLATION INSTRUCTIONS