Issue 6, February 2023 Model 44D User Guide
Page 6 Studio Technologies, Inc.
found wide acceptance as an audio “back-
bone” due to its ease of use, high perfor-
mance, strong interoperability, and wide
adoption by a large number of equipment
manufacturers. The Model 44D is a gen-
eral-purpose “tool” that helps to expand
Dante’s capabilities to facilities and equip-
ment that primarily supports signals in the
analog domain.
Careful attention to circuit design and
component selection ensures that excellent
audio quality is maintained. Extensive lter-
ing helps prevent damage or less-than-
optimal performance should DC voltage,
ESD (“static”), or strong RF signals be
present on the associated analog signals.
Conguration switches allow several Model
44D operating parameters to be selected.
The nominal audio levels of the line input
and line output functions can be inde-
pendently selected. In this way compatibil-
ity with SMPTE®and EBU nominal signal
levels is supported. Audio level meters
provide conrmation of system perfor-
mance during setup and operation. Two
general purpose input and two general
purpose output functions allow support for
installer-selected applications, including
party-line intercom call-light functions. Two
LEDs provide a direct indication of the sta-
tus of the GPO functions.
The Model 44D can be powered by Power-
over-Ethernet (PoE) or an external source
of 12 volts DC. Standard connectors
are used for the line inputs and outputs,
Ethernet, GPI/GPO, and DC power inter-
connections. The Model 44D’s enclosure
has a “1/2-rack” 1U form factor and weighs
less than two pounds, making it well suited
for use in portable applications. Alternately,
using one of the optional rack-mount front
panels, one or two Model 44D units can be
mounted in a single space (1U) of a stan-
dard 19-inch rack enclosure.
Dante Audio-over-Ethernet
Audio data is sent to the Model 44D us-
ing the Dante audio-over-Ethernet media
networking technology. Audio signals with
a sample rate of 44.1 or 48 kHz and a bit
depth of up to 24 are supported. The two
line input channels are converted to digi-
tal and then routed to transmitter (output)
channels on the Dante interface. Two
transmitter (output) channels from an as-
sociated Dante-enabled source device can
be assigned to the Model 44D’s receiver
(input) channels using the Dante Control-
ler application. These are then converted
into analog outputs.
Applications
The most basic application for Model 44D
is for transporting analog audio signals to
and from one location to another using
the data transport resources of a local
area network — there’s really no simper
means to getting high-quality audio from
“point A to point B” and back. With stan-
dard connectors and PoE power, setup
can be completed in just a few minutes.
This makes Model 44D units effective in
both xed and portable applications.
The Model 44D can also nd use when
an application already supports Dante.
For example, ports on a matrix intercom
system that directly supports Dante, such
as the RTS®ADAM®with OMNEO®, can
be routed to a Model 44D’s Dante output
(transmitter) and input (receiver) channels.
The Model 44D will then provide two ana-
log input and two analog output interfaces
for use in a variety of applications. These
can include interfacing with audio inputs
