Lowell MA250 - Manual

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 4
W, 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.
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 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
4
W, 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”.
1
REMOVABLE
PHOENIX
CONNECTOR
Instruction Sheet
IS-MA60/125/250
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
MA60 / MA125 / MA250
INSTALLATION SHEET
AND OPERATORS MANUAL