Setup
Installa
ti
on
CAUTION:
Before you begin, make sure your mixer ampli
fi
er is unplugged from the power source, the power switch is
in the "OFF" posi
ti
on, and all volume controls are set to minimum level (turned counterclockwise).
Loca
ti
on:
Take the unit out of its packaging (keep it for any return to the workshop). The PR-130A and PR-240A mixing ampli
fi
ers
can be installed in a standard 19” equipment rack or on a shelf. To install the unit in a standard 19” equipment rack,
please use the rack ears that are included with the unit. Do not mount mul
�
ple units directly on top of each other,
allow a 2U space between the units for convec
ti
on cooling. If a table or shelf installa
ti
on is the chosen route, be sure to
choose a
fl
at surface, with 12-inches (about 30cm) of air space around the unit for convec
�
on cooling, and that is free
of liquids or other such hazards.
To select an appropriate loca
�
on for your equipment, you must consider the distance between the mixer ampli
fi
er and
the speakers, the need to access the equipment to change the source or adjust the volume, the proximity of the
sockets electrical, etc. You must determine the length of the cables used to connect your equipment to the speakers.
Depending on the type of loudspeakers and the length of the cables, you can choose to route the signals to the
loudspeakers in low impedance or in constant voltage.
If you are using low impedance speakers, you must connect them to one of the low impedance outputs (4 ohms) of the
mixer ampli
fi
er with speaker cables. However, pay a
tt
en
ti
on to the diameter and length of the cables. If you are using
loudspeakers with built-in 70V transformers, o
�
en referred to as constant voltage systems, please connect the to one
of the high impedance (70V/100V) outputs. The advantage of these systems is that they allow the use of long cables to
connect several loudspeakers to the same ampli
fi
er. The PR-Series mixer ampli
fi
ers are ideal for this type of
applica
�
on as they are equipped with 70/100V output transformers.
Using the rack ears
How to a
tt
ach the rack ears.
1.
Locate the two rack ears and four rack-ear screws supplied.
2.
Place a rack-ear
fl
ush with the right front of the chassis.
3.
Insert a screw into the bo
tt
om hole of the rack-ear and chassis. Screw it in.
4.
Insert a screw into the top hole of the rack-ear and chassis. Screw it in.
5.
Repeat steps 2 to 4 for the le
�
side of the chassis.
6.
Remove the four legs from bo
tt
om of unit.
7.
Please refer to Figure 2.1
[ Figure 2.1 How to connect rack ears ]
– 8 –
PR-130A / PR-240A
