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Onyx 1640i

7. TALKBACK MIC

This is where you plug in your external talkback

microphone if you need to have one. This female XLR

connector has +48 VDC phantom power always applied,

so you may use dynamic or condenser microphones.

Note:

Almost all dynamic microphones may be used

with phantom power, but you might want to check the
documentation that came with your microphone just to
be sure.

8. LEFT/RIGHT XLR MAIN OUTPUTS

These male XLR connectors provide a balanced line-

level signal that represents the end of the mixer chain,
where your fully mixed stereo signal enters the real

world. Connect these to the inputs of your main power

amplifiers, powered speakers, or serial effects proces-
sor (like a graphic equalizer or compressor/limiter). It
provides a fully balanced signal that is the same level
as the 1/4" TRS main out jacks [10] next door (except
the 1/4" jacks are unaffected by the main output level
switch [9]).

9. MAIN OUTPUT LEVEL

When this switch is out (+4 dB), the XLR main

outputs [8] provide a "+4 dBu" line-level signal. You
can then connect these outputs to the line-level inputs
of power amplifiers, powered loudspeakers, or serial
processors.

When the switch is pushed in (mic), the XLR main

outputs are attenuated to microphone level. You can
then connect these outputs safely to the microphone in-
puts of another mixer, providing a submix for keyboards
or drums, for example, in a live sound application. The
main outputs can then be plugged directly into a stage
snake, and appear back at the front of house console
like any other microphone level source.

When mic is engaged, you can safely plug the
XLR main output into a mixer's microphone
input, even if it provides 48V phantom power.

The switch is recessed to reduce the chance of ac-

cidently turning it on or off when plugging things in.

10. LEFT/RIGHT 1/4" MAIN OUTPUTS

These 1/4" TRS output connectors provide balanced

or unbalanced line-level signals. This is the same signal
that appears at the XLR main outputs [8] (except
the 1/4" jacks are unaffected by the main output level

switch [9]). Connect these to the next device in the

signal chain like an external processor (graphic equal-
izer or compressor/limiter), or directly to the inputs of
the main amplifier.

11. MONO OUT

This 1/4" TRS output connector provides a balanced

or unbalanced line-level signal that is a combination of
the left and right main out [10] signals (L+R). You may
use this for a separate mix that does not require a stereo
feed, or to simply test the monaural compatibility of the
stereo mix.

12. MONO OUT LEVEL Control

This is a separate level control for the mono out [11].

It comes after the main mix fader [73] but before the
main output level switch [9], so turning the main mix
fader up and down does affect the mono out signal. With
this control turned all the way up, you will have 6 dB of
extra gain at the mono out.

13. MAIN INSERTS

These 1/4" TRS jacks are for connecting serial effects

such as compressors, equalizers, deessers, or filters. The
insert point is after the mix amps, but before the main
mix fader [73]. Refer to the description of the channel
insert on page 11 to see how to make this connection.

14. TAPE INPUTS

These stereo unbalanced RCA inputs allow you to play

a tape, CD player, iPod

dock, or other line-level source.

The tape in jacks accept an unbalanced signal using
standard hi-fi hookup cables.

Push in the tape button [45] to route the tape input

to the control room and phones outputs [16, 42]. This
allows you to play back recordings of your mixes.

Push in the assign to main mix button [46] to route the

tape input to the main outs [8, 10]. This allows you to play
back music between sets over the main PA speakers.

Pushing tape in the source matrix and push-
ing assign to main mix can create a feedback

path between tape in and tape out. Make sure

your tape deck is not in record, record pause,