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PA250A General Description:
The PA250A power amplifier provides 250 watts of continuous RMS power directly into a minimum 4W 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 600W 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 600W 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.
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
4W, 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".
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.
Lowell Manufacturing Company
Call: 800-325-9660
100 Integram Drive
Fax: 636-257-6606
1
PA250A
INSTALLATION SHEET
AND OPERATORS MANUAL
Pacific, Missouri 63069 U.S.A.
Click: www.lowellmfg.com
REMOVABLE
PHOENI X
Instruction Sheet
CONNECTOR
IS-PA250A
Issued: 1-18-19
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Related Manuals for Lowell PA250A
Summary of Contents for Lowell PA250A
- Page 1 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 600W line level balanced transformer isolated input with both inputs controlled by a tamper-resistant volume control located on the rear panel.
- Page 2 Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. CAUTION: Changes or modifications not expressly approved by Lowell Manufacturing will void the manufacturers warranty . REMOVABLE...
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Page 3: Technical Specifications
Hum and Noise: > 90dB below rated output (unweighted) Paging Horn Protection Low-Cut Filter The PA250A includes a low-cut filter (also called a “trumpet protect” filter) that is not activated when the amplifier is shipped from the factory. When the amplifier is to be... - Page 4 If shipping damage has resulted in the amplifier being inoperable out of the box, call Lowell Customer Service to arrange for a replacement . SOUND SYSTEM WIRING AND INSTALLATION GUIDELINES Never run microphone cables near AC power wires, data cables, telephone cables, or speaker wiring to avoid pick- up of extraneous signals.
- Page 5 . Rack mount ears are built into the front panel of the PA250A. If the amplifier will be rack mounted, we recommend that you provide a minimum of 1.75”...
- Page 6 8 Ohm Series/Parallel Speaker System Wiring The Lowell PA250A power amplifier includes a direct 4W output that can drive a minimum 4W speaker line without the use of a line matching transformer. The impedance of the speaker load must always be equal to or greater than the 4W impedance of the amplifier output.
- Page 7 For example: A Lowell MA60 could be replaced with a Lowell MA125 so that more speakers could be added to the system, with no other changes required to the existing speaker wiring or transformer taps.
- Page 8 Although headroom is always desirable, be assured that the Lowell amplifiers will survive and operate safely when fully loaded. Wiring Size and Length: Cable distance should be kept as short as possible to minimize power loss . The chart below can be used as a general guide showing various wire sizes and the maximum distance related to cable loading that speakers can be placed from the unit for an approximate 0.5dB loss (-12.5% power).
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