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5
IMPORTANT SENSITIVITY
ADJUSTMENT PROCEDURE!
So important we put it first, before anything
else.
To fully achieve the LM-3204 Mixer’s
impressive headroom and specs, you should
always “tune” the input sensitivity for each
channel.
FOLLOW THIS PROCEDURE FOR EACH
CHANNEL IN USE
1. Set the Control Room, Phones, Left and Right
Master Fader and Solo controls all the way
off. (As you are working through the steps,
you can bring these controls up a bit to hear
what you are doing, but be careful. There’s a
lotta level in this mixer.)
2. Apply signal to channel input.
Insert a stereo line input into the correspond-
ing Left and Right Input jacks at the rear of
the mixer.
or
Insert a mono line input into the correspond-
ing Left Input jack on the rear of the mixer.
3. Set channel strip controls as follows:
Gain control at “U” detent.
Solo switch down.
Mute switch up.
Balance control at “U” detent.
EQ controls at “U” detent.
Aux controls fully counterclockwise (off).
4. Apply an audio signal to the input. The
material and level you use to set up the mixer
should be vaguely representative of what you
will really be doing when you really do it. If
you’re connected to a tape deck or a CD
player, put some music on and push the
button! If you’re hooked up to a synthesizer,
tickle those plastic ivories!
5. The channel’s –20dB LED should light. The
L/R main meters will show the actual
internal operating level of soloed signals.
Now you will optimize levels.
For a meter reading of 0dBu with +4dBu
input (line level) signals, the settings in step 3
should be just about right. Adjust the channel
Gain control slightly so that you get peaks that
regularly hit 0dB on the Left and Right meters.
For –10dBV signals, you may have to turn
the channel Gain control clockwise to
boost the signal to read 0d B on
the Left and Right meters.
On the other hand, you might have to deviate
from this approach on certain channels. For
example, you don’t want to set the hi-hat cymbal
channel at 0dB. Use your judgement on this.
The Long Arm Exercise: For Microphone
signals (using an onboard Mackie mic
preamp), leave the channel Gain setting at
the “U” detent and instead adjust the Mic
Trim pot on the rear of the mixer until you
get peak levels of around 0dB on the Left and
Right meters. Remember, the sound coming
in the microphone should be typical of what
you will really be using. For patching instruc-
tions, see page 11, “Microphone
Preamplifiers.”
6. If desired (optional):
Adjust the channel strip’s EQ to about what
you will be using during the session.
Repeat Step 5.
7. Return the channel strip’s Solo button to the
up position.
8. Repeat steps 1–7 on the next channel that is
being used.
9. As you un-solo the channel strips to listen to
your mix, ease up the Left and Right master
faders to set a good mix level on the meters,
with occasional peaks of 0dB.