Lowell MA250 - Manual (Page 8)

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
8
RCA Phono Plug Connection
Pin Sleeve
Sleeve: Shield
Pin: Signal
TAPE OUTPUT CONNECTIONS
The amplifier includes two (2) parallel RCA/Phono high-impedance unbalanced auxiliary output jacks which may be
used for feeding recording devices such as cassette decks, DVD recorders, or to feed devices like assistive
listening transmitters. The parallel dual RCA jacks may be used to feed a mono signal to both the left and right
channel inputs of a stereo device, or one or the other of the RCA-phono connectors may be used to feed mono
outputs to two different devices. As shown in the AMPLIFIER BLOCK DIAGRAM on page 3, the tape output jacks
are fed from the output of the mixing section and before the master volume control. In other words, if you wish the
levels to remain the same in the recording regardless of the setting of the MASTER volume control (that may need
to be adjusted due to crowd requirements in a live performance), the tape output jacks are a good choice. If you
wish for the output signal level to be adjusted as you increase the MASTER volume control, see the PREAMP OUT
jacks described below.
PREAMP OUTPUT CONNECTIONS
The amplifier includes two (2) parallel RCA/Phono high-impedance unbalanced PREAMP OUT jacks which may be
used for feeding devices such as booster amplifiers. The parallel dual RCA jacks may be used to feed a mono
signal to both the left and right channel inputs of a stereo device, or one or the other of the RCA-phono connectors
may be used to feed mono outputs to two different devices (such as a booster amplifier or equalizer). As shown in
the AMPLIFIER BLOCK DIAGRAM on page 3, the PREAMP OUT jacks are fed from the output of the master
volume control. In other words, if you wish the levels to be adjusted as a result of changes in the setting of the
MASTER volume control (that may need to be adjusted due to crowd noise in a live performance), the PREAMP
OUT jacks are a good choice.
POWER AMP IN CONNECTIONS
The amplifier includes an RCA/Phono high-impedance unbalanced POWER AMP IN which feeds the local power
amplifier that is included in this unit. As shipped from the factory, a jumper is connected from one of the PREAMP
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.
Connection to
Lowell EQ1 equalizer
(EQ loop)
using only the
internal amplifier.
LOWELL
PA250
BOOSTER
AMPLIFIER
Aux In
Jack
To Speakers
Connection to
Lowell PA250
booster amplifier.
Note: Jumper cord shown is not included.
Note: Jumper cords shown are not included.
Inside of MA60, MA125, or MA250 Chassis
INTERNAL
POWER
AMPLIFIER
Power
Amp
In
RCA
Jack To Speakers Preamp Out
RCA Jacks
LOWELL EQ1
1/3 OCTAVE
EQUALIZER
¼”
High-Z
Input
¼”
High-Z
Output
Remove Factory
Installed Jumper
Between Pre-Out
And Power Amp In
Inside of MA60, MA125, or MA250 Chassis
INTERNAL
POWER
AMPLIFIER
Power
Amp
In
RCA
Jack To Speakers Preamp Out
RCA Jacks
Factory Installed
Jumper