Owner manual

Page 12
Reference Manual
P.I.P.-RPA
Fig. 3.12 Main Audio Input Wiring
Figure 3.12 shows how to wire a
balanced and unbalanced source or
daisy-chain output to the barrier block
connectors.
Important: If the amplifier is used in
either Bridged-Mono or Parallel-Mono
mode, you
must turn the Ch. 2 ampli-
fier level control off (fully counter-
clockwise). The input and level con-
trol of Ch. 2 are not defeated in mono
mode so any signal applied to Ch. 2
will beat against the signal in Ch. 1.
Refer to the amplifier
Reference
Manual for more information about
Bridged-Mono or Parallel-Mono
modes of operation.
near the output cables or noise and/
or feedback oscillation may occur. It
is wise to take similar precautions
with line-level input cables too.
To avoid hum, do not route the input
cables near power cables.
Figure 3.12 above shows how to con-
nect the audio cables to the main
audio inputs for both balanced and
unbalanced sources. It is important
not to strip away too much insulation
from the wires before attaching them
because the screw terminals are so
close to the front panel. We recom-
mend you strip away only
1
/
4
inch (6.4
mm) of insulation. Also, if stranded
wire is used, first tin the ends before
inserting them in the connector.
Important: If the amplifier is used in
either Bridged-Mono or Parallel-Mono
mode, you
must turn the Ch. 2 ampli-
fier level control off (fully counter-
clockwise). The input and level con-
trol of Ch. 2 are not defeated in mono
mode, so any signal fed into Ch. 2 will
beat against the signal in Ch. 1. As a
result, you should not use Input C or
D unless the Tie function is on and
you are mixing them into Ch.1.Please
refer to your amplifier’s Reference
Manual for more information about
Bridged-Mono or Parallel-Mono
modes of operation.
Ground Isolation
If present, ground loop problems can
be reduced by unsoldering or cut-
ting and removing the ground jumper
shown in Figures 3.13 and A.1.
The jumper, labelled Z1, is located
on the underneath side of the top
circuit board just in front of the prior-
ity DIP switch. When it is removed,
3.5 Wiring the Audio
Inputs
Because the gain of a Crown ampli-
fier equipped with a P.I.P.-RPA can
be quite high (as much as 90 dB) it is
very important to exercise care when
routing the input and output cables.
We strongly recommended that bal-
anced audio input wiring be used.
Important: Use shielded wire for mic
input cables and avoid routing them