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Installation
For use with compound horns, remove both protective plastic caps
and the plastic foam loading plug from the rear. Note: front end is
the one with wiring terminals.
Next, screw the large horn section onto the rear of the driver and
the small section onto the front. Hand tighten to slightly compress
rubber gaskets.
For use with all other horn types, rear cap and foam plug are left in
place and firmly hand tightened with horn attached to the front
directly to the driver terminals.
Transformer Model (1828T)
A transformer and power selection panel is installed in the base of
the housing. Power taps for the transformer are listed in Table 1.
Low-Frequency Driver Protection
When frequencies below the low-frequency cutoff for the horn
assembly are fed to the driver, excessive current may be drawn by
the driver. For protection of driver, amplifier, and transformer (if
driver with built-in transformer is used), capacitor(s) in series with
driver, or transformer primary are recommended. Table 1 indicates
Figure 1.
Distortion Response - Plane Wave Tube (1 inch)
(3 watt input)
Figure 3.
Impedance Response - Plane Wave Tube (1 inch)
www.electrovoice.com • Telex Communications, Inc. • www.telex.com
© Telex Communications, Inc. 02/2001
Part Number 38109-851 Rev A
recommended values. The values shown are for 200 Hz. Values
for other frequencies can be determined by using the formula:
C
= Values shown in the following table
[
]
C
x 200
200
C =
200
f
f = New Frequency
For drivers without transformers:
150 Vdc or 150 V non-polarized electrolytic, or two 150 Vdc
electrolytics of two times required value in series, back to back,
for 70 volt lines.
Table 1. Series Protection Capacitors for 200 Hz and Below
7
0
V -
o
t l
L
n i
P
o
w
r e
I
m
p
e
d
a
n
c
e
C
a
p
3
0
W
1
6
6
1
5
W
3
3
3
8
W
6
2
5
4
W
1
2
5
0
2
W
-
1
W
-
1
2 /
W
-
Figure 2.
Distortion Response - FC100 Horn
(1 watt / 1 meter)
Figure 4.
Impedance Response - FC100 Horn
8-ohm driver, 25 V - 100 mf
e
s
2
5
V -
o
t l
L
n i
e
s
a
i c
a t
n
c
e
I
m
p
e
d
a
n
c
e
C
a
p
a
i c
a t
5
m
f
-
-
2
m
f
-
-
1
m
f
-
-
m
f
m
0
5 .
1
5
6
5
-
3
1
2
2
m
-
6
2
5
1
m
-
1
2
5
0
5 .
m
n
c
e
f
f
f
f
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