Studio Technologies 220 2004 - Manual (Page 17)

Issue 2, August 2004 Model 220 User Guide
Page 18 Studio Technologies, Inc.
Headphone Source Selection
Switch assembly SW2 is used to config-
ure the source or sources that are routed
to the stereo headphone output. The
headphone sources are IFB channel 1,
IFB channel 2, line input 1, and line input
2. The IFB channels are provided by way
of the IFB input connector located on the
Model 220’s back panel. The line inputs
are connected by way of two connectors
also located on the back panel. Associ-
ated with line inputs 1 and 2 are level trim
potentiometers. They are provided so
that audio sources with a wide range of
nominal levels can be effectively used as
cue sources. Please refer to the Advanced
Operation section of this user guide for
details on using the trim pots.
Each of the available input sources can
be assigned to the headphone output’s
left channel, right channel, or both the
left and right channels. The Model 220’s
circuitry allows any combination of input
assignments to be made. For example,
consider the situation where a single-
channel IFB system, with both program
and interrupt audio on pin 3, is connected
to the Model 220. In this case it may be
desirable to assign this IFB signal to both
the left and right channels. This would en-
tail setting switches SW2-2 and SW2-6 to
their on positions. All other switches would
remain in their off positions.
A more complex application might have
a 2-channel IFB circuit connected to the
Model 220. In addition, a line-level audio
signal from a golf event “spotter” is con-
nected to line input 1. In a case such as
this, it would be typical for IFB channel 1
to be assigned to the headphone’s left
channel, IFB channel 2 assigned to the
right channel, and line input 1 also as-
signed to the right channel. This would
allow both IFB channel 2 and “spotter”
audio to be heard in the headphone’s
right-channel output. To achieve this
would require that switches SW2-1, SW2-
6, and SW2-7 be placed in their on posi-
tions. Note that using another announcer
console unit from Studio Technologies at
the “spotter” location could also prove ef-
fective. It would provide all the necessary
microphone preamplifier, talkback routing,
and headphone monitoring resources.
Note that in some cases a user may wish
to wear a headset or a pair of headphones
in a left/right orientation opposite of what’s
usual. In this situation the transducer
designated for the left ear would actually
supply audio to the user’s right ear, and
vice versa. A specific application where
Figure 6. Left and right channel headphone
source selection settings