Phonic AM844D USB, User Manual

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4 AM844D USB
English
CONTROLS AND SETTINGS
Rear Panel
19. Power Switch
This switch is used to turn the mixer
on and off. Ensure you turn all level
controls down before activating.
20. Phantom Power Switch
When this switch is in the on position, it
act48V of phantom power for all
microphone inputs, allowing condenser
microphones (well, the ones that don’t
use batteries) to be used on these channels. Activating Phantom
Power will be accompanied by an illuminated LED above the left
channel Level Meter. Before turning Phantom Power on, turn all
level controls to a minimum to avoid the possibility of a ghastly
popping sound from the speakers.
NB. Phantom Power should be used in conjunction with balanced
microphones. When Phantom Power is engaged, single ended
(unbalanced) microphones and instruments should not be used on the
Mic inputs. Phantom Power will not cause damage to most dynamic
microphones, however if unsure, the microphone’s user manual should
be consulted.
Channel Controls
21. Compressor Control and Indicator
This controls the onboard compressor
function on mono channels. Turning
this control up towards the 12 o’clock
position will adjust the threshold and
ratio of the compressor at varying
degrees. Once you reach the 12
o’clock position, the control will then
adjust the compression settings
along with an onboard expander (or,
in other words, a compander). The
LED that accompanies this control
will light up when the compressor is
triggered.
22. Gain Control
This controls the sensitivity of the
input signal of the Line/Microphone
input of mono channels, and the
Microphone input only of stereo
input channels. 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
adjusting it to a level that will allow the peak indicator occasionally
illuminate.
23. Low Cult Filter (75 Hz)
This button, located on channels 1 through to 12, will activate a
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. On stereo channels 9-10 and 11-12, the low
cut filter affects only the XLR Microphone inputs (and not the
line inputs).
24. High Frequency Control
This control is used to give a shelving boost or cut of ±15 dB to
high frequency (12 kHz) sounds. This will adjust the amount of
treble included in the audio of the channel, adding strength and
crispness to sounds such as guitars, cymbals, and synthesizers.
25. Middle Frequency Control
This control is used to provide a peaking style of boost and cut
to the level of middle frequency sounds at a range of ±15 dB.
The AM844D USB mixer also provides a sweep control, allowing
you to select a center frequency between 100 Hz and 8 kHz.
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, soothing overly harsh vocal and instrument sounds in the
audio.
The stereo channels of the AM844D USB mixer feature a High-
Mid and Low-Mid control instead of
the typical controls described above.
They provide a peaking style of boost
and cut to middle frequencies, where
the frequencies are set at 3 kHz and
800 Hz for the High- and Low-Mids
respectively.
26. 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.
27. AUX Controls
These four AUX controls alters the signal level that is being
sent to the aux 1 to 4 mixes, the signal of which is suitable for
connecting stage monitors, allowing artists to listen to the music
that is being played. AUX 1 and 2 feature a Pre/Post button,
which alternates the feed to the AUX mix between a post and
pre-fader feed. AUX 3, on the other hand, acts as an EFX send,
the signal of which can be used in conjunction with external
signal processors (which can be returned to the mixer via the
AUX return input), or simply as an Auxiliary output. Both the AUX
3 (EFX) and AUX 4 controls are post fader and are sent directly
to the corresponding outputs.
28. 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, the PAN control
will adjust the level that the left and
right should receive (pan), where as
on a stereo channel, adjusting the BAL
control will attenuate the left or right
audio signals accordingly (balance).
29. On Button and Indicator
This turns the channel on, allowing the
user to use the feed from the channel’s
inputs to supply the MAIN L/R, GROUP
1/2, GROUP 3/4, AUX and EFX buses
(as specified by the user, of course).
The corresponding indicator will be
illuminated when turned on.
30. 1-2, 3-4 and L-R Buttons
These handy buttons allow you to decide
the audio path of the corresponding
channel. Pushing the “1/2” or “3/4” buttons allows the signal to
be sent to the Group 1/2 or 3/4 mixes respectively, where the “L-
R” allows it to be sent to the Main L/R mix.
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