Helix Board 18 FireWire User's Manual PHONIC CORPORATION
page 8
22. 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.
�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 13/14 of the Helix Board
18 FireWire 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 (High-Mid is set at 3 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.
23. 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
�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.
24. AUX Control
This control alters the signal level that is being sent
to the auxiliary 1 mixing bus, the signal of which is
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 mixing bus between a post and pre-
fader feed.
25. EFX Control
This control alters the signal level that is sent to the
EFX send (AUX 3) 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.
26. 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).
27. 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, AUX and EFX buses. The corresponding
indicator will be illuminated when turned on.
28. 1-2 and L-R Buttons
These handy buttons allow you to decide the audio
path of the corresponding channel. Pushing the “1/2”
button allows the signal to be sent to the Group 1/2
mix, where the “L-R” allows it to be sent to the Main
L/R mix.
29. Peak Indicator
This LED indicator will illuminate
when the channel hits high peaks,
6 dB before overload occurs. It is
best to adjust the channel level
control so as to allow the PEAK
indicator to light up on regular
intervals only. This will ensure a
greater dynamic range of audio.
This indicator also doubles as a
Solo indicator, when the SOLO
button is engaged.
30. Solo Button
The Solo button is pushed to allow the signal of a
corresponding channel to be sent to the Control Room
/ Phones control (pre or post fader, depending on the
properties selected by the pre / post button, located
by the Control Room / Phones control), for use with
either headphones or studio monitors. This also allows
easier setting of the input gain and tracking of audio by
sound engineers. The Peak indicator above the Solo
button also doubles as a Peak Indicator, illuminating
when the signal reaches high peaks.
31. Channel Level Control (Fader)
This control will alter the signal level that is sent from
the corresponding channel to the appropriate mixing
buses (whether they are the MAIN L/R or AUX).
21
22
23
24
25
26
27
31
28
29
30
