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 PA250A amplifier. Those experienced with the use of a power amplifier will find that the input jacks and
terminals, output terminals, and controls follow industry standard conventions and will be very intuitive . Standard
4
W,
25V, and 70.7V 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
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
INSTALLATION SHEET
AND OPERATORS MANUAL
PA250A General Description:
The PA250A power amplifier provides 250 watts of continuous RMS power directly into a minimum 4
W
speaker load
or uses the internal 25V/70V output transformer to feed 250W to distributed speaker systems. The PA250A 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 PA250A includes a balanced transformer
isolated telephone paging input and a 600
W
line level balanced transformer isolated 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
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 rear panel.