10 Helix Board 24 FireWire MKII
16. S/PDIF Output
This RCA S/PDIF (Sony / Phillips Digital Interface)
jack is for the output of digital audio signals, allowing
the Main L&R audio from the Helix Board 24 FireWire
MKII to be passed to another device without having
to convert the signal from digital to analog and back
again. The output sampling rate is set to 44.1 kHz per
second – however, if the FireWire interface is in use, it
will use the sampling rate decided by the Helix Board
control software.
17. FireWire Interface
These two FireWire ports are for connecting the
Helix Board 24 FireWire MKII to any PC or Macintosh
computer. They allow all 16 input channels, as well
as an additional channel (as decided by the FireWire
Select Switch), to be sent to a PC or Mac computer.
The main stereo signal of the computer is also
returned to the Helix Board 24 FireWire MKII. The
returned FireWire signal can be utilized by selecting
it in the Control Room Source section on the face of
the mixer.
18. Power Connector and Fuse Holder
This port is for the addition of a power cable and
supply, allowing power to be supplied to the mixer.
Please use the power cable that is
included with this mixer only. The
Fuse holder, located above the AC
Power connector, is, of course, for
Helix Board 24 FireWire MKII fuse.
If the fuse happens to blow, open
the holder cover, and replace the
fuse with a suitable replacement
(as indicated underneath the
power connector).
Main Mixing Panel
19. 12V Lamp
This BNC socket allows you to attach a
12 Volt gooseneck lamp, allowing better
visibility in areas with poor light.
20. Phones Output
This output port is best suited for use with
headphones, allowing monitoring of the mix.
The audio level of this output is controlled
using the Phones control on the front panel’s
master section.
CONTROLS AND SETTINGS
Rear Panel
21. Power Switch
This switch is used to turn the mixer on and off. Ensure
you turn all level controls down before activating.
Activating the Power Switch will be accompanied
by an illuminated LED located above the right Level
Meter.
22. Phantom Power
By turning this switch selector
to the ON position will activate
+48V of phantom power for the
corresponding microphone inputs,
allowing condenser microphones
(well, the ones that don’t use batteries) to be used on
these channels. Activating the master Phantom Power
switch will be accompanied by an illuminated LED
above the left channel Level Meter. Before turning
Phantom Power on, turn the level control down of the
channel you wish to activate to a minimum and lower
all master output levels, as 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.
23. Mono Output Source Select Switch and Volume
Control
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level of the Mono/Subwoofer output. By using the
switch on the left, users are able to select signal they
wish to send through the Mono/Subwoofer output
between the main mix and AUX 4 mix. If, for example,
there is audio in the main mix you do not wish to
send to the subwoofer, simply sending all the audio
you wish to use to the AUX 4 send and set the select
switch to AUX 4.
24. Low Pass Filter
The mono output on the Helix Board 24 FireWire MKII
includes a Low Pass Filter (LPF) for removing high
frequency sounds to make the audio more appropriate
for use with subwoofers. The switch to the left turns
the LPF on and off, and the rotary control on the right
allows users to adjust the cut-off frequency between
60Hz and 160Hz.
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