Lowell PA250 User Manual

Pa250 installation sheet and operators manual

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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”.





Instruction Sheet


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 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.