Channel Controls - Phonic HELIX BOARD 18 FIREWIRE MKII Manual Del Usuario

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Channel Controls

20. Low Cult Filter (75 Hz)
This button 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
7/8 and 9/10, the low cut filter affects only the XLR Microphone
inputs (and not the line inputs).
21. 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 adjusting it to a
level that will allow the peak indicator occasionally illuminate.
22. 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.
HELIX BOARD 18 FIREWIRE MKII
23. 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.
These mixers also provide 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.
Stereo channels 11/12 and 1/14 of the Helix Board 18 FireWire
MKII feature a High-Mid and Low-Mid control instead of the
typical controls described above. They provide a peaking style of
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boost and cut to middle frequencies, where the frequencies are
set at  kHz and 800 Hz (High-Mid is set at  kHz and Low-Mid
is set at 800 Hz). Stereo channels 9/10 and 11/12 have a single
Middle Frequency control, with the center frequency set at 2.5
KHz.
24. Low Frequency Control
This control is used to give a shelving boost or cut of +/-15dB to
low frequency (80Hz) sounds. This will adjust the amount of bass
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included in the audio of the channel, and bring more warmth and
punch to drums and bass guitars.
25. FireWire Pre/Post Switch
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This switch is used to change the signal of the corresponding
channel that is sent to the Computer via the FireWire interface
between that of a pre-EQ, pre-fader, pre-low cut and that of a
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post-EQ, post-fader, post-low cut. In the upper-most position, the
2 channel will be pre, and in the lower position post.
26. AUX Controls
These controls alter the signal level that is being sent to the
auxiliary 1 and 2 mixes. The signals of these mixes are suitable
for connecting stage monitors, allowing artists to listen to the
music that is being played. Also included is a Pre/Post button,
which alternates the feed to the AUX 2 mix between a post and
pre-fader feed.
27. EFX Control
This control alters the signal level that is sent to the EFX send
(AUX ) output and the built-in digital effect processor. The EFX
send signal can be used in conjunction with external signal
processors (this signal of which can be returned to mixer via the
AUX return input), or simply as an additional auxiliary output.
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).
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