Ramsey Electronics UAM4 Manual page 16

both the left and right input connections.
Proceed to the "SELECTING BALANCED OR UN-BALANCED
INPUT" steps on the next page.
MONO INPUT
Place a jumper across the pins of jumper block H3 labeled
'JUMPER FOR MONO' located above and between the input
connectors J1 and J2.
Your UAM4 may be used in one of two mono out modes. You may use
it as a simple 40 amplifier or you may use it as if it is two 20 watt
amplifiers with a common input. In this way you can use it to drive two
independent speakers with 20 watts each. If you will be using it as a 40
watt amplifier see the "40 WATT MONO OPERATION" steps below. If
you want to use it as two separate 20 watt amplifiers go to the "DUAL
20 WATT MONO OPERATION" steps.
40 WATT MONO OPERATION
Solder a jumper between jumper points 'L-' and 'R-' located just
below the speaker terminals.
Solder a jumper between Jumper points 'L+' and 'R+' located
just below the speaker terminals.
Now go to the "SELECTING BALANCED OR UN-BALANCED
INPUT" section.
DUAL 20 WATT MONO OPERATION
Make sure there are no jumpers between 'L-' and 'R-' and
between 'L+' and 'R+'.
SELECTING BALANCED OR UN-BALANCED INPUT
Now we need to determine if your audio input is an un-balanced or balanced
signal. The most common sources are un-balanced. (For a more detailed
description of the differences between balanced and un-balanced signals
please refer to the "A TOUR OF THE UAM4" section in the beginning of this
manual.) The following steps will take you through how to connect the
inputs for both balanced and un-balanced signals.
An un-balanced signal has only one wire and a common ground for each
signal. One wire is the actual signal and the other will be a ground which is
common to all signals. So for a stereo signal there is a left and right signal
and a common ground for them. Usually these signals use an RCA Phono
type connector for each channel, (usually white for left and red for right).
These are commonly used on home audio component system, CD players,
TV's and cable/satellite receivers.
UAM4• 16