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OPTIMOD-PC
A
NALOG
M
IXER
Using +4dBu as the reference level, the system is calibrated correctly
when the I
duce –20dBfs at the WAVE output for recording/encoding applications.
The input stage has 20dB of headroom prior to the Input Level Control.
Hence, a +4dBu tone at the analog input indicates –20dB on the analog
input level meter. If the level meter hits full-scale when the A
R
EFERENCE
proximately +24dBu at OPTIMOD-PC's analog input and you must reduce
the output level of the device driving OPTIMOD-PC.
2. Adjust the Analog Output Reference Level control.
If you are using the Processing w/Limiting Output: An output level fader
setting of –12dB produces approximately +4dBu at the output with normal arbi-
trary processed audio.
When the analog output is set to receive P
–20dBfs 1kHz sinewave tone produces –18dB at the Analog Output Meter
and +2dB on an external meter with VU ballistics calibrated so that 0 VU
= +4 dBu and connected to Optimod-PC's analog output. This assumes
that:
• The Active Preset is Rock Medium.
• The
The Optimod-PC digital and WAVE output meters indicate –6 dBfs when
their respective O
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
calibration for the corresponding analog output reference level (+4 dBu or –10
dBV).
• When the Analog Output is set to D
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.
• When the A
A
NALOG
calibrated and set to unity gain with 20dB of headroom.
• When the A
level produces a –20dBfs digital output signal at the D
outputs, and a –20dBfs input signal from the D
produces a +4dBu output level when the A
L
EVEL
controls are found on the P
L/R I
NPUT
pages.
L
C
NPUT
EVEL
ONTROL
is set to +4
L
EVEL
DBU
L
control in the preset is set to 0.0dB.
IMITING
controls are set to 0 dB (maximum).
L
UTPUT
EVEL
O
L
C
UTPUT
EVEL
ONTROL
I
control is set to 0dB (maximum) and the
NALOG
NPUT
O
control is set to 0dB (maximum), the system is properly
UTPUT
I
R
NALOG
NPUT
EFERENCE
is set to +4dBu.
ROCESSOR
adjusted to 0dB (maximum). This will pro-
, you are exceeding a peak level of ap-
ROCESSING
to 0dB (maximum) to achieve correct level
, a –20dBfs 1kHz sine-
M
IRECT
IXER
is set to +4dBu, a +4dBu input
L
EVEL
IGITAL
NALOG
INSTALLATION
and D
M
IXER
IRECT
I
NALOG
NPUT
, a
W
L
ITH
IMITING
or WAVE
IGITAL
or WAVE
INPUTS
O
R
UTPUT
EFERENCE
2-27
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