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CONTROLS AND SETTINGS
Channel Controls
9.
Line/Mic Gain Control
This controls the sensitivity of the input
signal of the Line/Microphone input. The
gain should be adjusted to a level that
allows the maximum use of the audio,
while still maintaining the quality of the
feed. This can be accomplished by ad-
justing it to a level that will allow the peak
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indicator occasionally illuminate. All 4
mono channels feature this control.
10.
High Frequency Control
This control is used to give a shelving
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boost or cut of ±15 dB to high frequency
(12 kHz) sounds. This will adjust the
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amount of treble included in the audio of
the channel, adding strength and crisp-
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ness to sounds such as guitars, cym-
bals, and synthesizers.
11.
Middle Frequency Control
This control is used to provide a peaking
style of boost and cut to the level of
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middle frequency (2.5 kHz) sounds at
a range of ±15 dB. Changing middle
frequencies of an audio feed can be rather difficult when used
in a professional audio mix, as it is usually more desirable to
cut middle frequency sounds rather than boost them, thereby
soothing overly harsh vocal and instrument sounds in the audio.
12. Low Frequency Control
This control is used to give a shelving boost or cut of ±15 dB to
low frequency (80 Hz) sounds. This will adjust the amount of bass
included in the audio of the channel, and bring more warmth and
punch to drums and bass guitars.
13. Low Cut Filter (75 Hz)
This button, located on channels 1 through to 4, will activate a
low-cut / high-pass filter that reduces all frequencies below 75
Hz at 18 dB per Octave, helping to remove any unwanted ground
noise or stage rumble.
14. EFX Control
The EFX control alters the signal level that is sent to the EFX
mixing bus, which makes its way to the built-in Digital Effects
Processor and is in-turn sent through the EFX send output.
These controls are pre-fader, therefore any changes made to the
corresponding channel level control are not applied to the AUX
or EFX signals.
15. Pan / Balance Controls
This alternates the degree or level of audio
that the left and right side of the main mix
should receive. On mono channels, this
control will adjust the level that the left and
right should receive (pan), where as on a
stereo channel, adjusting the BAL control
will increase the left or right audio signals
accordingly (balance).
16. Level Control
This rotary control will alter the signal level that is sent from the
corresponding channel to the main mixing bus.
AM440DP
17. Peak Indicator
This LED indicator will illuminate when the device hits high
peaks, 6 dB before overload occurs. It is best to adjust the gain
of the channel so that the PEAK indicator lights up on intervals
only, if at all. This will ensure a greater dynamic range of audio.
18. +4 / -10 Switch
This button, located on all stereo channels,
is used adjust the input sensitivity of the
corresponding channels, which will adapt
the AM440DP to external devices which
may use different operating levels. If the
input source is -10 dBV (consumer audio
level), it is best to engage the switch,
allowing the signal to be heard. The +4
dBu level is suitable for Professional Audio
signals, which are considerably higher than
the consumer level. However, if you are unsure of the source's
operating level, we suggest leaving the switch disengaged until
you test the source's signal. You can then engage if necessary
(if the level of the input signal is obviously too low).
Digital Effect Section
19. Digital Effect Display
This 2-digital numeric display shows the
program number that is currently applied
to your EFX audio signal. When you
rotate the Program control, you can scroll
through different program numbers;
however the display will revert back to
the original program if a new program is
not selected within a few seconds. For a
list of available effects, please observe
the Digital Effect Table.
20. Sig and Clip Indicators
Located within the Digital Effect Display are Clip and Sig LEDs.
The Sig LED will light up when any signal is received by the
effect processor, and the Clip LED will light up shortly before
excessive signals are dynamically clipped. If the Clip LED lights
up too often, it may be advisable to turn down one or all EFX
controls on input channels to ensure the signal level is not too
high.
21. Program Control
This control is used to scroll through the various effects. Turning
the control clockwise will allow users to ascend into higher
program numbers, and turning it counter-clockwise will allow
users to descend into lower program numbers. Pushing this
control will apply the new effect. When a tap-delay effect is
selected, pressing this control will allow users to select the tap-
delay time.
By pushing the button several times, the effect processor
interprets the time between last two pushes and remembers this
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as the delay time, until the button is pushed again (this is kept,
even after the power is turned off). When the tap delay effect is
selected, a small LED will flash within the digital effect display
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window at the selected intervals.
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22. EFX "to Main" Control
This will adjust the level of the Digital Effect signal that will be
sent to the Main left and right mixing bus to be applied to your
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main feed.
23. EFX Routing Button
This button allow users to send the EFX signal to the Phones
mix for monitoring.
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