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OPTIMOD-PC
tabbed pages), click S
cation. Then follow the prompts.
Saving a setup is useful mainly if you wish to be able to paste this entire
setup to another OPTIMOD-PC card later. Any changes you have made to
the setup of the currently active card will be saved automatically for that
card when you click D
losing changes you made. See step (2.B) on page 2-20.
The Direct Mixer
The Direct Mixer looks the same as the Processor Mixer (see Figure 2-7 on page 2-
25). The Direct Mixer determines the gain applied to input signals before these sig-
nals are sent directly (without OPTIMOD-PC processing) to the output routing
switcher. If the output attenuator in the routing switcher is set to "0dB" and the
analog input and output reference levels are set identically (to +4dBu or –10dBv),
then the Direct Mixer faders will indicate the input/output gain directly in dB.
The default settings of "0dB" provide unity gain in and out of the OPTIMOD-PC card
for both the analog and the digital inputs. If you want to change a reference level
between a source and destination (for example, from –16dBfs to –18dBfs), you can
do so by adjusting the fader corresponding to the source (in our example, by setting
it to –2dB).
Note that you are limited by input headroom: if you set the D
OPTIMOD-PC's digital output level cannot exceed –2dBfs because this level corre-
sponds to 0dBfs at OPTIMOD-PC's digital 1 input.
If you are using a digital input and an analog output, note that OPTIMOD-PC's in-
ternal gain for both input and output is such that 0dBfs = +24dBu or +10dbV (for
A
R
NALOG
EFERENCE
output line amplifiers can drive +24dBu into a balanced load. However, the maxi-
mum analog output level they can drive into an unbalanced load is +18dBu. There-
fore, to match analog and digital clipping levels when driving an unbalanced load
with A
R
NALOG
EFERENCE
With A
either balanced or unbalanced operation and it is unnecessary to make
this adjustment.
The A
If you are mixing more than one active input, be careful not to exceed the head-
room of OPTIMOD-PC's mix bus, whose peak level is indicated by the M
meters on both the P
do not permit the "0" S
S
AVE
ETUP
; it is unnecessary to use S
ONE
settings of +4dBu and –10dBV respectively). OPTIMOD-PC's
L
EVEL
= +4dBu, set the A
L
EVEL
R
L
NALOG
EFERENCE
EVEL
fader is located in the O
O
NALOG
UTPUT
and D
ROCESSOR MIXER
this meter to light.
O
EGMENT
F
on the File menu in the Orban Control appli-
O
NALOG
UTPUT
= –10dBV, there is enough headroom for
L
UTPUT
EVELS
pages. To prevent clipping,
M
IRECT
IXER
INSTALLATION
S
to avoid
AVE
ETUP
1 fader to –2dB,
IGITAL
fader to –6dB.
page.
O
IXER
UTPUT
2-33
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