4
REMOVABLE
PHOENI X
CONNECTOR
Instruction Sheet
IS-PA250A
Issued: 1-18-19
Lowell Manufacturing Company
100 Integram Drive
Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660
Fax: 636-257-6606
Click: www.lowellmfg.com
PA250A Rear Panel
5
3
6
PA250A Front Panel
2
1
PASSIVE CONVECTION COOLING AND VENTILATION
This unit is cooled via passive convection and therefore designed for continuous operation . Excessive heat due to
poor ventilation can shorten the lifespan of electronic equipment and could void the manufacturer
’s warranty. Do
not block the amplifier
’s vent slots located on the top and bottom of the chassis.
Amplifier Installation and Connection
This unit was carefully checked and packed before leaving the factory . However, it is always a good idea to inspect
the shipping container and unit for indications of improper handling . If the unit has been damaged, make an
immediate claim to the dealer or distributor from whom it was purchased . If the unit was shipped to you, notify the
transportation company without delay, saving all packing materials, in order to process the claim.
INSPECTION
Before installing the amplifier, continue the inspection by running a quick performance check. Connect an 8
W
test
speaker to the 4
W
direct output terminals and a tuner, tape deck, or CD player to one of the aux inputs and set the
controls for operation.
CAUTION: TO PROTECT THE SPEAKER FROM DAMAGE, DO NOT TURN THE UNIT
ON UNTIL ALL CONNECTIONS HAVE BEEN MADE. IN ADDITION, MAKE SURE THE UNIT IS GROUNDED
BEFORE TESTING.
In this way you can check the basic operation of the amplifier before actually installing the
unit and making all of the final terminations required for the permanent installation. If shipping damage has
resulted in the amplifier being inoperable out of the box, call Lowell Customer Service to arrange for a replacement .
INITIAL PERFORMANCE CHECK
Never run microphone cables near AC power wires, data cables, telephone cables, or speaker wiring to avoid pick-
up of extraneous signals. Do not run high impedance unbalanced wiring more than 20' to avoid picking up noise
and affecting the frequency response of the system. Avoid running speaker cables near data or telephone cables,
or other low voltage wiring that could pick up the signal from the high level speaker cables. Always use shielded
cable for microphone and line level cables except the balanced 600
W
input line from a telephone system may be
typical telephone twisted pair cable. Make sure that all speakers are wired in phase with each other and always
test the speaker lines to make sure there are no short circuits before connecting them to the amplifier output.
SOUND SYSTEM WIRING AND INSTALLATION GUIDELINES
7
4
8
9
10
11 12
LED Peak Indicator (Red)
1
LED Power-On Indicator (Green)
2
3
IEC Power Cord Connector
Amplifier Circuit Breaker
4
Main Power Switch
5
Input Voltage Selector Switch
6
4W
/25V/70.7V Speaker Outputs
7
Master Volume Control
8
TEL-PAGE & 600
W
Gain Control
1
0
TEL (Telephone Page) Input
11
600
W
(Line Level) Input
12
Parallel Hi-Z Aux Input Jacks
9