Speaker Connection - Speco PL-60 SA Instruction Manual

Note: MOH output features an internal selector jumper (factory set on AUX-1) AUX-1~2 when
background music is provided at the AUX inputs. MOH output function depends on the jumper
location or locations that are selected, see illustration on page 7.
Screw terminal designations: G-GND, HOT-Signal positive, COM-Signal negative/common.
Overcoming Ground Loop Problems
If the amplifier is mounted in a rack unit (Use rack mount part # PBM-RK2), or is used with
equipment having its own ground, it is necessary to ensure that ground loops and the associated
problems of hum on the output signal are not introduced by the ground wiring. (see warning)
Warning
To overcome this problem if it occurs, the electrical and the mechanical ground on the amplifier
may be separated by completely removing the wire connecting the power source to ground.
CONSULT AN ELECTRONICS TECHNICIAN TO ACCOMPLISH THIS TO AVOID POTENTIAL
PERSONAL INJURY OR A HAZARDOUS CONDITION.

SPEAKER CONNECTION

The rear panel of the amplifier contains a 4 screw terminal strip for R and L speaker connection.
BE SURE TO CONNECT SPEAKERS PROPERLY, see line voltage instructions below.
The speaker lines are to be connected directly between the appropriate COM terminal on the 4 screw
terminal strip and the terminal corresponding to the impedance of the R and L speaker(s) .
(refer to figure 3).
Connect the cables to the terminals on the 4 screw terminal strip provided. Use the screw terminals
which correspond to the R and L speaker(s). One lead must always be connected to the COM.
This is just an example. If in doubt consult a qualified technician.
IMPORTANT NOTICE: When the 70V constant line voltages are used, a line
HOW TO CONNECT LINE MATCHING TRANSFORMERS IN PARALLEL
ALWAYS CONNECT LINE TRANSFORMERS IN PARALLEL
NEVER CONNECT LINE TRANSFORMERS IN SERIES
FIGURE 3
matching transformer must be used with each speaker. All
transformers must be connected in parallel.
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