2-28
INSTALLATION
ORBAN MODEL 1100
and +2dB on an external meter with VU ballistics connected to Optimod-
PC’s analog output. This assumes that:
•
The external meter is calibrated so that 0 VU = +4 dBu or –10 dBV, de-
pending on the setting of Optimod-PC’s A
NALOG
O
UTPUT
R
EFERENCE
L
EVEL
.
•
The Active Preset is Rock Medium.
•
The
L
IMITING
control in the preset is set to 0.0dB.
The Optimod-PC digital and WAVE output meters indicate –6 dBfs when
their respective
O
UTPUT
L
EVEL
controls are set to 0 dB (maximum).
If you are using the Direct Mixer Output:
The Direct Mixer Output is used
when Optimod-PC is used without processing as a sound card only.
Set the
A
NALOG
O
UTPUT
R
EFERENCE
L
EVEL
to +4dBu
or –10dBv depending on
whether OPTIMOD-PC’s analog output is driving professional or consumer
equipment, respectively. Set the
A
NALOG
O
UTPUT
L
EVEL
C
ONTROL
to 0dB (maxi-
mum) to achieve correct level calibration for the corresponding analog output
reference level (+4 dBu or –10 dBV).
•
When the Analog Output is set to
D
IRECT
M
IXER
, a –20dBfs 1kHz sine-
wave file produces –20dB at the Analog Output Meter and 0dB on an
external meter with VU ballistics connected to Optimod-PC’s analog
output. This assumes that the external meter is calibrated so that 0 VU
= +4 dBu or –10 dBV, depending on the setting of Optimod-PC’s
A
NALOG
O
UTPUT
R
EFERENCE
L
EVEL
.
•
When the
A
NALOG
I
NPUT
control is set to 0dB (maximum) and the
A
NALOG
O
UTPUT
control is set to 0dB (maximum), the system is properly
calibrated and set to unity gain with 20dB of headroom.
•
When the
A
NALOG
I
NPUT
R
EFERENCE
L
EVEL
is set to +4dBu, a +4dBu input
level produces a –20dBfs digital output signal at the
D
IGITAL
or
WAVE
outputs, and a –20dBfs input signal from the
D
IGITAL
or
WAVE
INPUTS
produces a +4dBu output level when the
A
NALOG
O
UTPUT
R
EFERENCE
L
EVEL
is set to +4dBu.
•
If you use a digital reference level higher than –20dBfs or an analog
reference level higher than +4dB, you will lose headroom if you wish
to retain unity gain. Because the analog input’s absolute clipping level
is +24 dBu (with the
A
NALOG
I
NPUT
R
EFERENCE
L
EVEL
set to + 4 dBu), re-
ducing the setting of Optimod-PC’s
A
NALOG
I
NPUT
control will not re-
gain the lost headroom. For example, a +8 dBu analog reference level
can provide no more than 16 dB of headroom. For this reason, ele-
vated reference levels are not recommended for use with Optimod-PC
unless you fully understand the headroom tradeoffs that result.
3.
Select the Stereo/Mono input mode for the analog input.
You can choose whether the fader operates on both stereo channels applied to
the analog input, or if it operates in mono, driving the left and right channels of
the processing with identical signals. The choices are:
