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10
Connecting The PL 2404 - General Suggestions
The actual connections you’ll make to and from the PL 2404 will vary according
to the environment you use it in and the particular equipment you have. In the
“PL 2404 Applications” sections at the rear of this manual, you’ll find some
suggested setups. Here are a few basic rules concerning PL 2404 connections
that will apply in most situations:
• In general, it’s best to make all connections with the PL 2404 and any
connected power amplifiers turned off. If you must make connections with
the power on, make sure that the Main and Control Room Level knobs are
completely counterclockwise and that all four bus faders are completely
down (at their “∞” position). Whenever powering down, bring the Main and
Control Room Level knobs completely counterclockwise and set all four bus
faders completely down, turning off the main power amps first. Wait a few
seconds for their power supplies to discharge and then turn off all connected
equipment, turning the PL 2404 off last.
• Try to use balanced connectors and cabling wherever possible. These kind
of connections do a better job of rejecting extraneous noise and hum and
generally provide a cleaner signal. Although the PL 2404 will accept unbal-
anced connectors throughout, it specifically provides electronically balanced
inputs for all line inputs and for its Main and Control Room outputs. The
wiring diagram below shows how 1/4" TRS (Tip/Ring/Sleeve) connectors
should be wired for use with these inputs and outputs:
Unbalanced cables use standard 1/4" phone connectors, wired as follows:
• Make one connection at a time and then monitor the incoming signal. If you
hear a distinct hum or buzz, you may have a grounding problem with that
particular device. See the “Grounding Techniques” section on page 15 in
this manual for information on how to avoid grounding problems.
• When using channels 1 and 3, be sure not to connect both a microphone
and line level input simultaneously—use one or the other. The diagram
below shows how your mic connectors should be wired:
TIP +
GROUND
RING -
RING
TIP
SLEEVE
+ SIGNAL
GROUND
+ SIGNAL
GROUND
3 - SIGNAL
1 GROUND
2 + SIGNAL
TO MIXER