Channels 1 to 6 each include a balanced line input on
3-pole TRS (Tip, Ring, Sleeve) ¼” phone jack. This
accepts line level signals of -31dBu to +16dBu on
either balanced 3-pole jacks or unbalanced 2-pole
jacks. Unplug the microphone input if you want to
use the line input.
The line input is used for a wide variety of sources
including instruments such as guitars, keyboards and
samplers, signal processors such as effects units, and
replay devices such as tape, CD and disc players.
A high impedance guitar or instrument pickup can be
plugged into the channel in several ways as shown in
the diagram. Plug direct if the instrument has a
sufficiently high output and is near the console. For
lower level outputs or where longer leads are used,
problems with interference pickup can be overcome
by plugging the instrument into an active DI (Direct
Injection) box which converts it to a low impedance
balanced signal less prone to interference and signal
degradation. Plugging the guitar into an inline effects
box or foot pedal achieves the same. If you are using
a separate guitar combo amplifier you could plug into
the pre-amp or slave output. Some musicians prefer
to use a microphone to capture the ‘sound’ of the
amplifier rather than inject it dry into the console.
Radio microphones often provide a choice of outputs,
either mic or line level. Before adjusting the gain on
the console check that the transmitter and receiver
levels are correctly adjusted.
Channels 7 and 8 each feature two stereo inputs, input
1 on balanced 3-pole TRS jacks, and input 2 on
unbalanced RCA phono jacks. This gives you a
choice of input connector type to match the source
equipment and leads available. The two inputs mix
together so that you can plug two stereo sources into
the channel at the same time. If the sources have
different output levels adjust the channel gain for one
source, then match the second source using its own
output level control. Use the PFL meters and
headphones to check for correct gain setting.
The dual input facility reduces the number of
channels you need. For example a stereo keyboard
can be mixed with an associated MIDI voice module
or drum machine. Backing tracks can share the same
channel with a CD player used to play intermission
music, or two backing track players can be mixed
together. Differences in the channel settings for each
source can be stored and recalled from the song
memories when required.
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