MAKING CONNECTIONS
Inputs and Outputs
1. XLR Jacks
These jacks accept typical 3-pin XLR
inputs for balanced and unbalanced
s i g n a l s . T h e y c a n b e u s e d i n
conjunction with microphones –
such as professional condenser,
dynamic or ribbon microphones –
with standard XLR male connectors,
and feature low noise preamplifiers,
serving for crystal clear sound
replication. The Helix Board 24
Universal features a total of sixteen
Microphone inputs.
NB. When these inputs are used with condenser microphones, the
Phantom Power should be activated. However, when Phantom Power
is engaged, single ended (unbalanced) microphones and instruments
should not be used on the Mic inputs.
2. Line In Jacks
This input accepts typical 1/4" TRS (balanced) or TS
(unbalanced) inputs, for balanced or unbalanced signals. They
can be used in conjunction with a wide range of line level
devices, such as keyboards, drum machines, electric guitars,
and a variety of other electric instruments.
3. Insert Jacks
The primary use for these 1/4" TRS phone jacks is for the
addition of external devices, such as dynamic processors or
equalizers, to the corresponding mono input channel. This will
require a Y cord that can send and receive signals of the mixer
to and from an external processor. The tip of the TRS jack will
send the signal from the input channel, and the ring will return
the signal back to the mixer (the sleeve is the grounding).
4. Direct Outputs
These connections are for the direct output of the signals
received by mono channels 1 through to 8, post-fader, post-EQ,
post-HPF, and post-mute. They are most commonly used to
connect multitrack recorders.
5. Auxiliary (AUX) Returns
The 1/4" TRS AUX Return inputs are for the return of audio to
the Helix Board 24 Universal mixer, processed by an external
signal processor. If really needed, they can also be used as
additional stereo inputs. The feed from these inputs can be
adjusted using the AUX Return controls on the face of the mixer.
When connecting a monaural device to the AUX Return 1, 2 and
4 inputs, simply plug a 1/4" phone jack into the left (mono) input,
and the signal will appear in the right as well. This, however,
does not work for the AUX Return 3.
NB.When any device is plugged into the mixer's corresponding EFX
Return inputs (AUX Return 3), the signal processed by the mixer's
internal digital effect engine is then not fed to the Main L/R; the signal fed
into the EFX Return 3 inputs will be instead.
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Helix Board 24 Universal
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6. Auxiliary (AUX) Sends
These 1/4" TRS phone jacks are the final output of line-level
signal fed from the corresponding auxiliary send mixing buses,
and are best suited for use with external effect processors or
stage monitors. Feeding the output from the Auxiliary outs to
an amplifier - and possibly an equalizer - and then to a floor
monitor speaker allows artists to monitor their own instruments
or vocals whilst performing. The AUX 5 and AUX 6 Sends take
their signal directly from AUX Controls 3 and 4, when the 5/6
Shift Button is activated.
7. Group Outs
These 1/4" phone jacks output the final feed from the Group 1,
2, 3 and 4 Faders on the main panel of the mixer. These outputs
can be used to feed multi-track records, as well as an amplifier
and speakers to be used along with the Main Speakers.
8. CTRL RM (Control Room) Output
These two 1/4" Phone Jack outputs feed the signal altered by
the Control Room level control on the face of the mixer. This
output has extensive use, as it can be used to feed the signal
from the mixer to an active monitor, for the monitoring of the
audio signal from within a booth, among many other possible
uses.
9. DSP Effect Output
These ports are for the immediate output of the EFX signal,
processed by the internal effect processor, the level of which is
not determined by the AUX 3 Return / EFX control on the face
of the mixer. This can be used to send to external devices, for
monitoring purposes, or returned to a few channel on the Helix
Board 24 Universal, and routed to the AUX 1, 2, and 4 outputs
(the AUX 3 control must, of course, be turned down to avoid
forming a feedback loop), as well as the Group Outs, allowing
the processed signal to be sent to multiple destinations for
various applications.
10. Foot Switch Jacks
These ports are for the inclusion of a foot switch (non-latchable),
used to remotely adjust properties of the built-in Digital Effect
processor, to the mixer. The uppermost jack is used to turn the
device on and off, where the lower jack is used for adjusting tap
delay properties.
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11. Mono / Subwoofer Output
T h i s X L R a n d 1 / 4 " T R S
output feeds a monaural
s i g n a l o f t h e M a i n L - R
signals combined or the AUX
4 signal (depending on the
Mono Source Select Switch),
the level of which is adjusted
by the accompanying level
control. This is ideal for
u s e w i t h a m o n o s o u n d
system, or for the addition
of a subwoofer to your set of speakers, adding more punch to
low frequency sounds at your PA or monitoring system. Also
featured is an Insert point, allowing external devices, such as a
compressor, to be used to alter the mono signal before it is fed
through the outputs.
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