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6.0 FRONT PANEL CONTROLS
On the front panel, from left to right you will notice five
control
knobs
and
six
pushbutton
switches.
Of
these, the
"drive" and "output ceiling" controls are the most important.
6.1
Drive
The drive control adjusts the amount of limiting which will
take
place
for
a
given
input level.
It
is
similar
to a
threshold control
except that
no change
in peak
output level
occurs as the drive is adjusted for more limiting.
An
ordinary
threshold control would reduce the output level as more limiting
is obtained, and thus require an output gain make-up control
to
restore the desired peak output
level.
In this case, it
would
be impossible to calibrate an output gain make-up control to any
specific output level, since that would depend on the
threshold
setting.
The Studio Dominator therefore 1s much simpler to
use
than the usual limiters with threshold controls.
6.2
Output Ceiling
The output ceiling control sets the
absolute maximum
peak
output
voltage
from the
limiter.
Expression of
the ceiling
level is in units of peak dBu.
For those not familiar with peak
dBu, this is merely the peak amplitude of an audio wave relative
to
1.1
volts.
The
1.1
value is derived from the peak value of a
sine wave producing
1
milliwatt into a
600
ohm load.
Thus,
dBu
is
the
voltage
equivalent
to
dBm
without
regard
for load
impedance, and
peak
dEu is the
voltage equivalent to
peak
dBm
without
regard
to
load
impedance.
Since
the
Studio
Dominator output
impedance is
very low,
it acts
as a voltage
source and will thus produce the same calibrated output
voltage
into any normal load impedance.
Thus, dBu
is
a convenient
unit
of output level calibration since it directly correlates to
dBm
into
a
600
ohm
line
and
is
more-or-less
a
standard
of
measurement in audio systems which
mix
600
ohm lines with
high
impedance lines.
The output range of the Studio Dominator is
-2
to
+21
dBu in
1
dB steps.
The
range
switch sets
the
range of
the
output ceiling
control to either
-2
to
+9
or
+10
to
+21
dEu.
To determine the output level from the Studio Dominator
in
peak
volts
(Ep)
when
dBu
is
specified,
use
the following
equation:
dBu
Ep = Antilog
x
1.1
volts
20
1 9
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