Mackie Onyx 1620i Quick Start Manual Download Page 10

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Onyx 1620i

Aux 1-4

AUX SEND 1-4

The four mono 1/4" TRS aux sends on the rear panel

allow you to send balanced or unbalanced line-level
outputs to external effects devices or stage monitors,
independent of the main mix.

Aux sends 1-4 are independent of each other, so you

can set up four separate aux mixes. The aux 1 send
output signal is the sum of all the channels whose aux
1 send control is set to more than minimum. Similarly,
aux 4 send is the sum of all the channels whose aux 4
send control is set to more than minimum. The overall
aux output level can be adjusted with the aux send
master controls.

AUX SEND 1-2 TO FW 13-14

When this button is engaged, aux send 1 and 2 are

available as FireWire signals 13 and 14 to send to a
computer. For example, you can use a computer with
audio production software and effects plugins, as an
effects host. This substitutes wonderfully for an
outboard hardware effects processor. (Mixer channels
13-14 have no direct FW output when this button is
engaged.)

See page 16 for an example of setting up a software

effects processor using the aux sends and FireWire.
Performance will vary based on system hardware.

PRE or POST

The aux sends can either be pre-channel-fader or

post-channel-fader, depending on the position of the
pre/post switches in the aux master section.

For stage monitor work, use PRE, so the stage

monitors do not increase in volume when the channel
fader is adjusted. This allows you to set up the
monitor mix and levels just right, and not have it change
every time a channel fader is adjusted. Stage monitors
can either be passive speakers powered by an external
amplifi er, or powered speakers with their own amplifi er.

For external processors, use POST. In this way, the

feed to external processors will vary in level if the
channel fader is adjusted. For example, the level of any
returned effect (like an echo) will also change if the
channel fader is changed, keeping them in the same
ratio (wet/dry).

Modifi cation: Pre-EQ Aux Sends

The pre-fader aux sends are post-EQ, so they are

affected by the channel EQ controls. The circuit boards
can be modifi ed so the pre-fader aux sends are pre-EQ
instead of post-EQ. For example, your stage monitors

will not be affected by any channel EQ adjustments.
This modifi cation can be done by an authorized service
center. Contact our technical support chaps for details.

AUX RETURN 1-4

These 1/4" TRS stereo input connectors allow you to

add the stereo processed output from external effects
processors or other devices to the main mix. Adjust the
level of the incoming signals with the aux return master
controls.

Alternatively, you can use these inputs to add any

stereo line-level signals to your main mix, so it could be
another line-level source, not just an effects processor.

If you are connecting a mono source, use the left

(mono) aux return input, and the mono signals will
appear on both sides of the main mix.

RETURN to AUX 1

The signals going into aux return 3 can also be added

to aux send 1 by engaging the return to aux 1 switch.
When engaged, the aux return 3 signal to the main mix
will be interrupted.

For example, you could add the effects returned from

an external effects processor fed by aux send 3, to your
stage monitors fed by aux 1.

SOLO