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Front Panel Features
LOW EQ is a shelving filter that provides
12 dB of boost and cut below 100Hz.
HIGH EQ is a shelving filter that provides
12 dB of boost and cut above 10kHz.
VOLUME is a master volume control used
to adjust the overall volume of the signal
at the POWER OUTPUTS.
Use the POWER switch to turn the UP4000
Series on and off.
The STD-BY indicator lights when the
amplifier is in standby mode.
Note: Standby mode is disabled by
default. An internal jumper (J1 on the
input board) must be changed to enable
standby mode. See Figure 1 on back page.
The OVERLOAD indicator lights when the
amplifier is operating in overload, a
condition generally caused by a problem
on the speaker line. When the amplifier is
switched on, the OVERLOAD light comes
on for a few seconds. This is normal and
does not indicate a problem.
When the OVERLOAD circuit is activated,
the OVERL. 300mA output on the
COMMANDS terminal strip is also activated.
The SIGNAL indicator lights when a signal
is present at the POWER OUTPUTS.
The PEAK indicator lights when the output
signal is approaching clipping.
The ON indicator lights when the AM4000
is turned on and ready for operation.
Rear Panel Features
POWER INPUT provides a means to
connect an external 24 VDC power supply
or battery as an alternative or backup
power source. The AM4000 Series
seamlessly switches to the backup supply
if there's an AC power loss. When both AC
power and 24 VDC power are connected,
the DC power is switched off.
Note: The unit is not equipped with
battery charging capability.
The D.C. FUSE protects the DC POWER INPUT
circuit. Replace with the same type fuse only.
POWER OUTPUTS are screw-terminal
connections for connecting speakers to the
4-ohm, 25V, 50V, 70V, or 100V outputs.
WARNING: To prevent the risk of electric
shock, never touch the bare wires coming
from the output terminals of the amplifier
when it is switched on. When all
connections have been made, insulate
the output terminals of the amplifier
using the protective cover provided.
UP 4161 - P.A. AMPLIFIER
Constant-Impedance Output
The total impedance of the speakers and
cable connected to the "4Ω" constant-
impedance output should be 4 ohms.
Connect the "4Ω" terminal to the "+"
(HIGH) speaker terminal, and the "0"
terminal to the "–" (LOW) speaker terminal.
Constant-Voltage Output
In a constant-voltage system, each
speaker must be equipped with a line
transformer having an input voltage equal
to that of the line (e.g., 25V, 50V, 70V, or
100V). Typically, these line transformers
have selectable power taps (i.e., 2.5W,
5W, 10W) for connecting to the constant-
voltage line. CAUTION: The sum of the
wattage values of the speakers must not
exceed the output power of the amplifier.
Connect the appropriate POWER OUTPUT
voltage terminal to the "+" (HIGH) leg and
the "0" terminal to the "–" (LOW) leg of the
distributed speaker system.
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS:
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
REPLACE WITH THE SAME TYPE FUSE AND RATING.
UTILISE UN FUSIBLE DE RECHANGE DE MÊME TYPE.
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
DEBRANCHER AVANT DE REMPLACER LE FUSIBLE
The ground (
) terminal is internally
connected to the chassis and safety
ground on the AC linecord.
The PRIORITY terminal activates the
priority function for the BALANCED IN by
using an external normally-open switch to
short-circuit the PRIORITY terminal to the
GND
(ground) terminal. When the
PRIORITY function is enabled, the
UNBALANCED IN is muted (no signal from
the UNBALANCED IN is transmitted to the
outputs).
The GND terminal is the common connec-
tion point for BALANCED IN and PRIORITY.
The BALANCED IN terminals are the main
inputs for the amplifier and accept a
balanced line-level signal (0 dBu nominal).
Connect signal high (+) and low (–) as
indicated below:
The BALANCED IN has a priority function,
and attenuates the UNBALANCED IN when
closing an external normally-open switch
connected between the PRIORITY terminal
to the GND (ground) terminal.
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