MAKING CONNECTIONS
INPUTS AND OUTPUTS
1. XLR Microphone Jacks
These jacks accept typical 3-
pin XLR inputs for balanced
and unbalanced signals. They
can be used in conjunction
with
microphones
as
professional
dynamic or ribbon microphones
- with standard XLR male
connectors, and feature low noise preamplifiers,
serving for crystal clear sound replication. The Helix
Board 12 FireWire MKII mixers feature a total of four
standard XLR microphone inputs.
NB. When these inputs are used with condenser microphones,
the Phantom Power should be activated. However, when
Phantom Power button is engaged, single ended (unbalanced)
microphones and instruments should not be used on the Mic
inputs.
2. Line Inputs
This input accepts typical 1/4" TRS or TS inputs, for
balanced or unbalanced signals. They can be used
in conjunction with various line level devices, such
as keyboards, drum machines, electric guitars, and
a variety of other electric instruments.
3. Stereo Channels
The Helix Board 12 FireWire MKII mixer
features a couple of stereo channels,
thrown in for maximum flexibility. Each
of these stereo channels features two
1/4" TRS phone jacks, for the addition
of various line level input devices, such
as electronic keyboards, guitars and
external signal processors or mixers.
These Stereo Channels can also be used as Mono
channels, where the signal from any 1/4" phone jack
plugged into the Left stereo input will be duplicated to
the Right input due to the miracle of jack normalizing
(this does not work in reverse, however).
4. Stereo AUX Return
These 1/4" TS inputs are for the return of audio to
the Helix Board 12 FireWire MKII mixer, processed
by an external signal processor. If really needed,
they can also be used as additional stereo inputs,
with a level control located on the face of the mixer.
The Stereo AUX Return can also accept Mono
signals, where plugging the 1/4" phone jack of any
device into the Left input will cause the signal to
be duplicated to the Right input also (this does not
work in reverse, however). Signals processed by the
built-in digital effects processor are cut-off when any
1/4" phone jack is plugged into the AUX return 2.
6
–
such
condenser,
5. AUX / Effects Send
These 1/4" TS outputs may be used to connect to
an external digital effect processor, or even to an
amplifier and speakers (depending on your desired
settings), to the mixer. The AUX send is a pre-fader
signal, suitable for sending to monitors to allow
performers to monitor their music. The EFX send
signal is post-fader, suitable for sending to external
effect processors, and then return back to the AUX
returns.
6. Main L and R Outputs
These two ports will output the final stereo balanced
line level signal sent from the main mixing bus.
The primary purpose of these jacks is to send the
main output to external devices, which may include
power amplifiers (and in-turn, a pair of speakers),
other mixers, as well as a wide range of other
possible signal processors (equalizers, crossovers,
etcetera).
7. Control Room Outputs
These two 1/4" Phone Jack outputs feed the signal
altered by the Control Room / Submix 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 other possible uses.
8. Phones
This stereo output port is suited for use with
headphones, allowing monitoring of the mix. The
audio level of this output is controlled using the
Control Room / Submix rotary control.
9. Record Out
These outputs will accommodate RCA cables, able
to be fed to a variety of recording devices.
10. 2T Return
This stereo RCA input is
used to connect the mixer
with external devices, such
as tape and CD players, and
feeds the signal to the Main
L-R mixing bus.
HELIX BOARD 12 FIREWIRE MKII