Lowell PA250 - Manual

Optional Accessories (sold separately):
Lowell Manufacturing offers a full line of 19" equipment cabinets, wall mount shelves, rack mount AC power panels,
AC power strips, and cooling fans that can be used to install the Lowell Amplifier products.
See www.lowellmfg.com for product details.
Getting Started:
Please study carefully the “IMPORTANT SAFETY INSTRUCTIONS” that are given on page 2 before applying power
to your PA250 amplifier. Those experienced with the use of a power amplifier will find that the input jacks, output
jacks, and controls follow industry standard conventions and will be very intuitive. Standard 8
W, 25V, and 70V
speaker outputs are provided. Those that are not familiar with the speaker wiring required for these industry
standard outputs will find a very helpful section covering this topic on pages 6, 7, and 8
of this “Installation Sheet
and Owner’s Manual”.
1
REMOVABLE
PHOENIX
CONNECTOR
Instruction Sheet
IS-PA250
Issued: 5-1-14
Lowell Manufacturing Company 100 Integram Drive Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660 Fax: 636-257-6606 Click: www.lowellmfg.com
PA250
INSTALLATION SHEET
AND OPERATORS MANUAL
PA250 General Description:
The PA250 power amplifier provides 250 watts of continuous RMS power directly into an 8
W speaker load. A rear
panel switch connects the internal 25V/70V output transformer to feed distributed speaker systems. The PA250
was designed to be used as a 250
watt booster amplifier to increase the power capability of Lowell’s MA Series
mixer/amplifiers, or as an all-in-one telephone system paging solution. The PA250 includes a balanced telephone
paging input and a 600
W line level balanced input with both inputs controlled by a tamper-resistant volume control
located on the rear panel. A Hi-Z unbalanced Aux input with parallel RCA input connectors is provided for a music
program source input. A unique music ducking circuit mutes the aux music input when a page signal is present at
either the telephone paging input or the 600
W line level balanced input. The mute circuit may be defeated by
removing the chassis cover and changing a circuit board jumper. A paging horn protection ( also called “trumpet
protection”) low-cut filter is available by cutting a separate circuit board jumper. A master volume control, main
power switch, and circuit breaker are provided on the front panel. An un-switched AC convenience outlet is
provided on the rear panel.