15
Owner’s Manual
Owner
’s Manual
25. TALKBACK LEVEL
Use this knob to control the level of the talkback
signal being routed to the various outputs. This controls
the talkback level for either the internal or external
TALKBACK MICs.
You should start with the TALKBACK LEVEL control
turned down, and then slowly turn it up until you get
confi rmation from whoever is listening to headphones
or monitors that they can hear you. Once you have set
the level, you can leave it there for the duration of the
session (or the gig).
26. EXTERNAL MIC Switch
If you are in a noisy environment, the built-in talkback
mic may not work as well because it picks up the ambi-
ent noise as well as your voice. You will probably have
better results if you use an external microphone that
you can talk directly into.
If you are using an external mic, you must push in
the EXTERNAL MIC switch. The indicating LED lets
you know when the switch is pushed. When the switch
is out, the built-in TALKBACK MIC is used, regardless
of whether or not you have an external mic plugged in.
When the switch is pushed in, the built-in mic is discon-
nected and only the external mic is used.
27. DESTINATION
Push in the CR/PHONES switch to route the talkback
signal to the PHONES [30] output. Use this to commu-
nicate with the talent in the studio through the head-
phones during a recording session. When the talkback
circuit is activated (by pushing the TALKBACK [28]
switch) and the CR/PHONES switch is in, the CONTROL
ROOM outputs are attenuated by 20 dB to allow the
engineer’s voice to come through loud and clear.
Push in the AUX 1-4 switch to route the talkback
signal to the AUX 1 through 4 outputs [62]. Use this to
communicate with the musicians on-stage through their
monitors during a live performance, or to studio musi-
cians through a headphone distribution system.
Push in the AUX 5-6 switch to route the talkback
signal to the AUX 5 and 6 outputs. This splits up the
talkback signal in the AUX SENDS so you can talk to
one group without the other group hearing (e.g., “Yeah, I
know the drummer sucks. We’re fi ring him on Monday!”)
Push in the SUB 1-4 switch to route the talkback
signal to the SUB 1-4 OUTs [60].
By the way, it is okay to have any combination, or
all, of the destination switches pushed in at the same
time. The talkback signal will be routed to all the
destinations. But if you don’t have any of the destina-
tion switches pushed in, the talkback signal won’t go
anywhere. You might as well be talking to a brick wall.
28. TALKBACK Switch
This is a momentary switch, meaning it’s only active
when you hold the switch down. As long as you hold
this switch down, the talkback signal is routed to the
outputs determined by the destination switches [27].
Release the switch, and the talkback circuit is turned off.
29. LAMP
This female BNC connector provides 12 volts DC on its
center pin. Connect any quality gooseneck lamp here.
30. PHONES
This is where you plug in your stereo headphones. It is a
1/4" TRS stereo jack and provides the same signal that is
routed to the CONTROL ROOM outputs [59], as determined
by the CONTROL ROOM/PHONES SOURCE matrix [18].
The volume is controlled with the PHONES knob [21].
WARNING:
The headphone amp is
designed to drive any standard head-
phones to a very loud level. We’re
not kidding! It can cause permanent
hearing damage. Even intermediate
levels may be painfully loud with some headphones.
BE CAREFUL! Always start with the PHONES level
turned all the way down before connecting headphones
to the PHONES jack. Keep it down until you’ve put on
the headphones. Then turn it up slowly. Why? Always
remember:
“Engineers who fry their ears, fi nd them-
selves with short careers.”
31. LEFT/RIGHT Level Meters
The Onyx 1640’s peak meters are made up of two
columns of twelve LEDs, with three colors to indicate
different ranges of signal level, traffi c light style. They
range from –30 at the bottom, to 0 in the middle, to +20
(CLIP) at the top.
The 0 LED in the middle is labeled LEVEL SET
to show where the level should be when adjusting a
channel’s gain in the solo mode, as described in “Set the
Levels” on page 5.
If nothing is selected in the CONTROL ROOM/
PHONES SOURCE matrix [18] and no channels are
in SOLO, the meters won’t do anything. To display a
signal level, a source must be selected in the CONTROL
ROOM/PHONES SOURCE matrix, which feeds the CON-
TROL ROOM [59] and PHONES [30] outputs. The meters
refl ect the program level of the selected source prior to
the CONTROL ROOM and PHONES [20/21] level knobs.
Summary of Contents for 1640
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