Manual
Table Of Contents
Model 44D User Guide Issue 3, August 2018
Studio Technologies, Inc. Page 19
presented to the line inputs should match
the Model 44D’s configuration. If the nomi-
nal input level is configured for –20 dBFS
this will equate to a nominal analog input
level of +4 dBu. If the nominal input level
is configured for –18 dBFS this will equate
to a nominal input level of 0 dBu. As such,
if the nominal level of the Dante output
(transmitter) channels is 6 dB different than
expected, either high or low, a user should
confirm that the Model 44D’s input configu-
ration has been set correctly.
The line input circuitry is protected from
damage should a moderate DC voltage
be accidentally connected. For example,
no damage will occur if a powered analog
party-line intercom circuit (typically 28 to
32 volts DC from 3-pin XLR pin 2 to pin 1)
be accidentally connected. This protection
would also be effective should P48 phan-
tom power associated with a microphone
signal be accidentally connected.
The frequency response of the line inputs
will depend on the configuration of the
low-pass filter function. If the filter is en-
abled most energy above 10 kHz will be
removed. This will be effective for voice-
applications such as intercom or talent
cueing (IFB). If support for high-quality,
full-bandwidth audio is necessary ensure
that the low-pass filter function has been
disabled. This will also apply if 20 kHz
nominal “call light” or signaling tones need
to pass through the Model 44D’s line input
to the Dante output (transmitter) channels.
Line Outputs
The line outputs are electronically bal-
anced (differential) and intended to be
connected to various analog inputs with
nominal impedances of 2 k (2000) ohms or
greater. The nominal analog level of signals
present on the line outputs will depend on
the Model 44D’s configuration. If the nomi-
nal output level is configured for –20 dBFS
this will equate to a nominal analog out-
put level of +4 dBu. If the nominal output
level is configured for –18 dBFS this will
equate to a nominal output level of 0 dBu.
As such, if the nominal analog output level
is 6 dB different than expected, either high
or low, a user should confirm the Model
44D’s configuration.
No special precautions are necessary
when using the line outputs in settings
where a variety of signals are present. As
with the line inputs, the line output circuitry
is protected from damage. For example,
no damage will occur if a powered analog
party-line intercom circuit or a microphone
signal with P48 phantom power present
be accidentally connected.
Similar to the line inputs, the frequency
response of the line output will depend
on the configuration of the low-pass filter
function. If the filter is enabled most en-
ergy above 10 kHz will be removed. This
will be effective for voice-applications such
as intercom or talent cueing (IFB). If sup-
port for high-quality, full-bandwidth audio
is necessary ensure that the low-pass
filter function has been disabled. This will
also apply if 20 kHz nominal “call light”
or signaling tones need to pass from the
Model 44D’s Dante receiver inputs to the
line outputs.
Level Meters
The Model 44D contains four 5-segment
LED level meters, two associated with the
line inputs and two associated with the
line outputs. The meters are provided as
a support aid during installation, configu-
ration, operation, and troubleshooting.