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MA60 / MA125 / MA250 General Description:
The MA60, MA125, and MA250 mixer/amplifiers, all have identical features except for the maximum power output.
The MA60 is equipped with a 60 watt power amplifier, the MA125 is equipped with a 125 watt power amplifier, and
the MA250 is equipped with a 250 watt power amplifier. Each model includes 4W, 8W, 25V, and 70V speaker
outputs that are available at a screw terminal strip. The units may be powered by a switchable 115VAC or 230VAC
@ 50/60Hz or by 24VDC. The main AC input is protected by a circuit breaker on the rear panel. An unswitched
convenience AC outlet is provided on the rear panel that is protected by a separate circuit breaker. Each model
includes 5 input channels that are switchable from XLR mic connectors to aux input dual combining RCA -phono
connectors.
An AUX-6 input channel is provided with dual combining RCA-phono connectors and a rear panel
level control. Mic-1 mutes channels 3 through 6. A separate telephone input with a rear panel level control mutes
all other inputs.
Dual RCA-phono parallel tape-out connectors and dual RCA-phono parallel PRE-OUT (preamp-
out) connectors are located on the rear panel near the POWER -AMP-IN RCA-phono connector. A jumper is
included that couples one of the PRE-OUT jacks to the POWER-AMP-IN jack. A chassis-ground termination screw
is available on the rear panel. The front panel includes channel 1-5 volume controls, treble and bass controls, a
master volume control, a main power switch, and an output level LED display. Rack mounting brackets are included
with each model.
Getting Started:
Please study carefully the "IMPORTANT SAFETY INSTRUCTIONS" that are given on page 2 before applying power
to your MA60, MA125, or MA125 power amplifier. Those experienced with the use of a mixer/amplifier will find that
the input jacks, output jacks, and controls follow industry standard conventions and will be very intuitive . Standard
4W, 8W, 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 10, 11, and 12 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
MA60 / MA125 / MA250
INSTALLATION SHEET
AND OPERATORS MANUAL
Pacific, Missouri 63069 U.S.A.
Click: www.lowellmfg.com
REMOVABLE
PHOENIX
Instruction Sheet
CONNECTOR
IS-MA60/125/250
Issued: 3-6-18
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Summary of Contents for Lowell MA60
- Page 1 The MA60, MA125, and MA250 mixer/amplifiers, all have identical features except for the maximum power output. The MA60 is equipped with a 60 watt power amplifier, the MA125 is equipped with a 125 watt power amplifier, and the MA250 is equipped with a 250 watt power amplifier. Each model includes 4W, 8W, 25V, and 70V speaker outputs that are available at a screw terminal strip.
-
Page 2: Important Safety Instructions
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... -
Page 3: Amplifier Block Diagram
Note: Black rack mounting brackets are included. Speaker Level Outputs: Screw terminal strip, 4W, 8W, 25V, 70V, MA60: 60W RMS, MA125: 125W RMS, MA250: 250W RMS Tape Outputs: Dual parallel RCA-phono jacks, 1V @ 4.7kW output Preamp (“Pre”) Outputs: Dual parallel RCA-phono jacks, 1V @ 600W output... - Page 4 Convenience AC Outlet Mic 1 Mute Switch (Mic 1 Mutes Ch 3-6) * Switch selects between Line inputs (RCA jacks) and Microphone level inputs (XLR jack or screw terminals) Lowell Manufacturing Company Instruction Sheet 100 Integram Drive Pacific, Missouri 63069 U.S.A.
- Page 5 F. To mount the amplifier in a Lowell equipment cabinet, use standard 10-32 Phillips-head machine screws (like the Lowell model RS or RSP rack screws) with integral plastic washers to protect the finish of the front panel of the amplifier. R ack mounting brackets for the amplifier are included.
- Page 6 , but another simple way to eliminate the ground loop is to replace the RCA to RCA cord with a Lowell TSM-ISO isolation transformer that is sold separately . LINE LEVEL “AUX” INPUT CONNECTIONS The amplifier includes high-impedance unbalanced auxiliary inputs which may be used for connecting the output of an AMFM tuner, CD player, cassette deck, or other music program source.
- Page 7 “ON” position. Channel-6 has no mic inputs. The Channel-6 (Aux 6) level control is located to the left of the AUX 6 RCA-Phono input jacks. The Channel-6 aux inputs never mute any other channels. Lowell Manufacturing Company Instruction Sheet 100 Integram Drive Pacific, Missouri 63069 U.S.A.
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Page 8: Tape Output Connections
OUT jacks to the POWER AMP IN JACK so the MASTER volume control adjusts the input to the local power amplifier. The illustrations that follow describe connections where the jumper may need to be removed. Inside of MA60, MA125, or MA250 Chassis Remove Factory... - Page 9 Inside of MA60, MA125, or MA250 Chassis Remove Factory Connection to Installed Jumper Power One (1) Between Pre-Out And Power Amp In INTERNAL LOWELL Aux In 1/3 octave Preamp Out PA250A POWER To Speakers Jack To Speakers equalizer using a...
- Page 10 8 Ohm Series/Parallel Speaker System Wiring Lowell amplifiers include 8W and 4W outputs that can drive basic 8W speakers without the use of any line matching transformers. The impedance of the speaker load must always be equal to or greater than the impedance of the amplifier output.
- Page 11 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 12 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.
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