Studio Technologies 210 2008 - Manual (Page 30)

Issue 4, October 2008 Model 210 User Guide
Page 30 Studio Technologies, Inc.
–10 dBu. So that the rotary level controls
provide a more comfortable range of
operation during actual use, reducing the
level of a “hot” input signal by 3 to 6 dB
is preferred, versus having a full +4 dBu
nominal level.
Note that if one or two line input cards are
installed in a Model 210, both “dry” line-
level audio signals and a “wet” IFB circuit
can be connected at the same time. The
audio sources will be routed to the head-
phone outputs by way of the headphone
source configuration switches. Each of
the four possible audio sources can be
routed to the left-headphone output, the
right-headphone output, or both head-
phone-output channels. Details on how
to use these switches are provided in the
Configuration section of this user guide.
In “emergency” situations it’s possible to
connect line-level audio signals directly
to the Model 210’s IFB input connector.
This can be successfully done as long as
several limitations are taken into account.
The first limitation is that the 10 k ohm
input circuit presents an unbalanced load
to the source. In most cases this shouldn’t
pose a problem. If a balanced intercon-
nection scheme must be maintained, an
in-line isolation transformer can be used.
A second limitation is that the audio level
presented must not exceed 0 dBu or sig-
nal “clipping” may occur. Prepare a 3-pin
male XLR-type connector so that the
line-level audio source designated as IFB
channel 1 is connected with signal high
on pin 2 and low/shield on pin 1. The
audio source designated as IFB channel 2
should be connected with signal high
on pin 3 and low/shield on pin 1. With
this connection scheme the nominal
input level is –10 dBu, the same as with
an IFB circuit. This may require that an
external attenuator (“pad”) be used to
reduce the level of the connected signal.
As expected, powering the Model 210
requires an external source of 24 volt DC
to be connected.
Additional Connectors
Two spare connector locations are provid-
ed on the Model 210’s back panel. From
the factory they contain blank plates that
can be readily removed and replaced with
a variety of XLR-type connectors. These
spare connector locations are specifi-
cally included so that a Model 210 can
be customized to meet the many specific
needs that arise in broadcast and related
audio applications. Expected uses for
these locations include adding a 5-, 6-, or
7-pin XLR-type connector to allow direct
connection of a broadcast headset. Other
uses include creating a “loop through”
or “mult” functions for the talkback out-
put or IFB input connections. In addition,
Studio Technologies offers an optional line
input card that mounts directly in a spare
connector location. This was previously
described in this user guide.
The spare connector locations are
compatible with the Neutrik DL-series
of connectors. For flexibility, versions are
available that provide from three to seven
contacts. For example, a compatible 3-pin
female connector would be Neutrik part
number NC3FD-L-1. To support headsets
the NC6FDS-L-1 is often used. This is
a 6-pin female connector with the unique
Switch-craft 6-pin arrangement. The
hardware that secures the blank plates to
the Model 210’s back panel is also intend-
ed to secure the replacement connectors.
If connectors are added to the Model
210’s spare connector locations adding
labels to those connectors can be helpful.