Ramsey Electronics UAM4 Manual page 17

It may also use a single 3.5mm or ¼ in stereo phone plug with both left, (the
tip connection) and right, (the small ring connection), and a common ground
which is the remaining sleeve of the connector. The 3.5mm jack is typically
used for computer and portable CD/MP3 player outputs. So far all these
signal sources are un-balanced.
If the equipment you are connecting to is not the usual consumer home or
computer equipment then you may have a balanced signal source. This
type signal has two signal lines and a ground for each one. It is probably
best to read the "A TOUR OF THE UAM4" section in the beginning of this
manual for a more detailed description of balanced signals. Also the
operator manual for the equipment will be of help if you have problems.
If you are going to use your UAM4 as a stereo amplifier then you will be
using both the left and right channel inputs. If you are using your UAM4 as
a mono amplifier either as a single 40 watt amplifier or as two 20 watt
amplifiers you will use only the right channel input in the following steps.
SELECT INPUT TYPE
Based on the above information, if your input is an un-balanced type ,
continue reading. If your input is balanced go to the "BALANCED INPUTS"
steps.
UN-BALANCED INPUTS
Place a short jumper wire from the '-' terminals to the 'GND' terminal
on the left, J1, and right, J2, input connectors.
Connect the signal line from each source to the '+' terminals on the
left, J1, and right,J2, input connectors.
Connect the ground or shield wire to the 'GND' terminals on these
connectors.
That's it for the un-balanced input connections. Now it's time to connect
your speakers. Go to the "CONNECTING YOUR SPEAKERS" section.
BALANCED INPUTS
Your input signal source is a balanced type signal. There should be 3
wires associated with each signal. One is the ground connection and
the other two are the + and – signal lines. You should refer to the
owner's manual of your equipment to determine the configuration of the
signal lines. Connection to the UAM4 is straight forward once the
configuration is known. Simply connect the corresponding +, - and
ground lines to the +, - and GND terminals on the UAM4 input
connections J1 and J2.
UAM4• 17