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FRONT/REAR-PANEL CONTROLS, SWITCHES,
INDICATORS, AND CONNECTORS
Figure 12 below displays the front panel on the mixer/power
amplifier with numbers that point at each control, indicator, and
switch. You can find the corresponding number and name
description for each control, switch, or indicator in the text below.
Figure 12. Front-Panel Control, Switches,
and Indicators for the 1707C
4
3
6
INITIAL SETUP AND OPERATION OF
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7 10 11 8 12 1
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MAINFRAME WITH MODULES INSTALLED
Initial Setup of an Input Module
You can buy and install the following input modules from
ElectroVoice:
The 1781A programmable input module. The 1781AT
programmable input module with 1785A input isolation
transformer, and the 1780A and 1780AT mic/line input modules.
To initially set up an input module, follow these steps:
1. Rotate the input module's gain control to the 12:00 o'clock
(MID) position for planned microphone inputs or to the
5
MIN (fully counterclockwise) position for line-level inputs.
13
If the input type is unknown, rotate the gain control to the
MIN position.
2. Rotate the high-cut (HF) filter to the FLAT
position.
3. Rotate the low-cut (LF) filter to the FLAT
position.
Initial Setup of an Output Module
2
You can buy the 1783 line output module from ElectroVoice.
This module can be installed with or without the optional 1786
output isolation transformer (also available from Altec Lansing).
n
To initially set up an output module, rotate the output module's
p
u
h s
p -
u
h s
output level control (labeled GAIN on the rear panel) to the MIN
w
t i
h c
w
h
e
n
position.
Initial Setup of the Mainframe
n
o i t
m
e
e t
s r
1. Rotate the MASTER output level control on the front panel
i
c n
e r
a
e s
r o
g
of the mainframe to the position (fully counterclockwise).
e r
a
e s
l
v e
l e
2. Set the compressor/limiter ON/OFF switch to the OFF
. l e
position.
(
e r
) d
3. Set the tone control EO IN/DEFEAT switch to the DEFEAT
position.
s u
y l
v
r a
a i
b
e l
Operating the 1700 Series Mixer/Power Amplifiers
t a
w
i h
h c
1. Connect a source representative of the type of input signal
D
t e
r e
m
n i
s e
to one of the input module positions, if any. Slowly rotate
o t
n
r o
m
l a
the input module's gain control clockwise until the mixer/
power amplifier's green LED display (-10 dB) on the
D
t e
r e
m
n i
s e
input-level front panel section fully illuminates. This is the
t e
y b
h t
e
nominal level for providing the most efficient performance
and headroom.
r o
o
t u
f o
h t
e
The mixer/power amplifier's red LED display may briefly
e t
n
o i t
m
e
e t
. r
illuminate on signal peaks. This is permissible as long as
s n
. e
Y
o
u
a c
n
it does not flash more than fifty percent of the time. If it
e z
o r
s
t e
n i t
. g
does, reduce the gain of the input module by rotating its
r o
gain control counterclockwise or use an external pad.
r P
v o
d i
s e
NOTE:
a c
n
o
b
a t
n i
n i t
g
?
R
o
a t
e t
The LED display precedes each frontpanel
n
e t
c r
o l
k c
i w
e s
input-level control. As a result, it will always indicate
the nominal and peak levels regardless of input
n
channel settings. Please refer to the mainframe
t n
o r
s l
w
h
e
n
A
o c
u
t s
- a
block diagram shown in Figure 5.
a
n
d
T
R
E
B
L
E
g
a r
d
u
a
e t
d
u
l s
i y
c n
e r
a
e s
e t
c
o l
k c
i w
e s
o t
d
c e
e r
a
e s
v o
r e
o l
a
d
s l
h t
t a
m
y a
8
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