Harbinger L2404FX-USB LvL series, User Manual, Page: 7 / 24

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L2404-USB
USB MIXER
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HPF Switch
This button turns on the High Pass Filter, which acts as a rumble filter to help decrease low
frequency noise beneath 75Hz, such as 60Hz hum from AC power from connected or nearby
electronics or appliances or noise from walking on the stage when a microphone is on.
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Insert
The insert jack is designed for inserting a dynamic processor or EQ into the signal path of the input.
The jack is a TRS jack, which means that you need an insert cable, which is a Y cable with a stereo
TRS plug on one end and two separate TS mono jacks at the other end. One of the mono plugs goes
into the dynamics processor input and the other mono plug goes into output of the effects processor.
This creates a loop of the output of the mic preamp from the mixer into the dynamics processor and
then back into the mixer input (prefader).
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Gain Control
Gain Control: Controls the input gain for the selected channel, from either the mic or line input.
If the gain is set too low, the output signal will be noisy when you turn it up at the level control. If
gain is set too high, it will distort. For best performance, set the gain while looking at the Level LED
meters. Start with the Gain knob fully to the left. Press the Solo button next to the Channel Fader
and press the PFL button under the Solo Mode Section beneath the LEDs on the right side of the
mixer. You’ll see the level of the input shown as green, orange and red LEDs. Now slowly turn up
the Gain knob. The signal should reach the orange LEDs during louder passages. If it reaches the
red, the signal will be distorting so reduce the Gain a bit. Remember to keep some “headroom”, or
additional space on the LEDs, to prevent the occasional very loud sound from distorting.
Sidebar: "Why are there two volume controls?" The Gain and Level controls work together to get the best
performance out of the mixer. A quiet signal may need more gain than a loud guitar amp going into a
sensitive microphone. Set the gain so that the level on each channel is roughly the same, then use the Level
controls to set the balance that you want in your mix.
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Compressor
A compressor is a dynamics processor that increases the perceived loudness of the signal by
evening out the loud and quiet passages for a more consistent signal level. This knob controls the
threshold of the Compressor. Turn the knob to the right to lower the threshold, which increases the
perceived loudness. Turn the knob all the way to the left to raise the threshold. While the knob is in
the "OFF" position, no practical signal will reach the High threshold. Therefore, the Compressor will
be percieved as OFF.