Lowell MA30 - Manual (Page 5)

Instruction Sheet
IS-MA30
Issued: 9-10-14
Lowell Manufacturing Company 100 Integram Drive Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660 Fax: 636-257-6606 Click: www.lowellmfg.com
5
POWER WIRING
The MA30 includes a power cord with a standard 15A 120VAC 3-prong grounded plug. A push-to-reset circuit
breaker for the amplifier is provided on the rear panel. An unswitched 500W maximum convenience outlet with a
separate circuit breaker is also provided on the rear panel. Warning: THIS UNIT MUST BE EARTH GROUNDED .
PASSIVE CONVECTION COOLING AND VENTILATION
This unit is cooled via passive convection and therefore designed for continuous operation . Excessive heat due to
poor ventilation can shorten the lifespan of electronic equipment and could void the manufacturer’s warranty . Do
not block the amplifier’s vent slots located on the top and bottom of the chassis .
LINE LEVEL “AUX” INPUT CONNECTIONS
The amplifier includes high-impedance unbalanced auxiliary inputs which may be used for connecting signal
sources such as an AMFM tuner, CD player, or cassette deck. A push switch is provided on the MIC/TEL channel
that selects either the MIC/TEL screw terminal input or the Aux 2 input. A push switch is provided on the
PROGRAM channel that selects either the PROGRAM screw terminal input or the Aux 3 input. Two (2) RCA-phono
connectors are provided for each aux input so stereo input cables can be connected . The stereo input signal is
converted internally to a mono signal. Mono inputs need only use one or the other of the RCA-phono connectors.
MIC LEVEL INPUT CONNECTIONS
The amplifier includes a low-impedance balanced microphone input at the MIC /TEL channel with the TEL/MIC
switch in the MIC position. Phantom power is NOT available. If Phantom power is required for your application, you
may use an outboard phantom power supply (sold by others), or consider an upgrade to the Lowell MA60 Mixer/
Amplifier which does have phantom power available on the microphone channel inputs .
MOUNTING THE AMPLIFIER
This MA30 may be placed on a wooden or metal wall-mount shelf. Do not remove the plastic feet from the bottom
of the amplifier chassis. When the amplifier is placed on a countertop or is shelf-mounted, the plastic feet maintain
the proper spacing under the amplifier for passive convection cooling. Do not place anything on top of the amplifier
where the vents on the top of the chassis would be blocked . If the amplifier will be rack mounted, we recommend
that you provide a minimum of 1.75
” of open space above and below the unit to assure proper ventilation. Provide
ventilation fans in the equipment cabinet if that is required to maintain an amplifier operating temperature of no
higher than 92
o
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. Lowell rack brackets 30RK (rack mounting kit) and 30HRK (half-rack mounting kit) for the
amplifier are sold separately. The 30WK (wall mounting kit) for the amplifier is also sold separately. The wall
mounting kit brackets may be used to mount the amplifier to a telephone wiring board or a any flat wall surface .
MUSIC-ON-HOLD (MOH) OUTPUT
The music-on hold output (MOH) is an 8 ohm speaker level output that may be used to feed external devices
including the music-on-hold input of a telephone system. It is important to understand the signals that will be
present at the MOH output. The microphone, telephone, and program inputs are never present at the MOH output.
The AUX 1, AUX 2, and AUX 3 inputs are the only signals that are fed to the MOH output. The front panel controls
(including the treble and bass controls) have no effect on the MOH output. The aux inputs are routed to the MOH
output directly. The only control that affects the MOH output is the MOH level control on the rear panel of the
chasis.
TELEPHONE INPUT CHANNEL
The amplifier includes a telephone input at the MIC /TEL channel with the TEL/MIC switch in the TEL position. This
input accepts a low impedance balanced 600
W line level input that would typically be available as a page port output
from a telephone system.
TELEPHONE CHANNEL INPUT WIRING
GND COM HOT
MIC/TEL INPUT
(Set switch on TEL)
From the
Telephone
System
Page-Port
Output
600
W Twisted-Pair Wiring
Shielded wiring from the telephone system is typically not required, but if
shielded wiring is used, drain the shield at the telephone input and butt
the shield (no connection) at the telephone system page port output.
BUTT SHIELD
(No connection) DRAIN
SHIELD