Before connecting other equipment to the mixing console, check the impedances
and levels of both. If the impedances and levels do not match, mixing will be very
difficult and the S/N ratio will also be adversely affected.
Each input channel of the RX-31C is provided with a TRIM control. Thorough
understanding of the function of a TRIM control will make mixing easily.
Trim Control
Input
Output
HEAD AMP
The function of the TRIM control is to control the
negative feedback volume of the head-amp so that the
gain of the head-amp can also be changed. Because of
this, enough dynamic range, even for high level signals
is ensured. Also, the S/N ratio will be better by decreas-
ing the gain of the head-amp.
For example, a condenser microphone, a dynamic microphone and a playback
deck with output levels of — 55dBm, — 50dBm and +4dBm, respectively are con-
nected to the mixing console.
Condenser
Microphone
in –55dBm level
Dynamic
Microphone
in –50dBm level
Playback
Deck
in +4dBm level
The Phantom Power Switches, MIC/LINE Selector
switches, TRIM Controls and Channel ON/OFF
switches are set as shown in figure at left.
The TRIM controls should be properly adjusted
depending on the signal level of the other equip-
ment connected, so that each input channel fader
will be horizontally lined up, as this will make
operation easier.
TRIM controls must also properly set, so that the
peak indicator will not be lit. In general, each input
channel fader is adjusted around the nominal posi-
tion, and the master fader is also set at a nominal
position.
Nominal Fader Position
– 10 –
Effective Mixing
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