Studio Technologies M233-01151 - Manual (Page 21)

Model 233 User Guide Issue 5, November 2014
Studio Technologies, Inc. Page 21
“spotter” connected 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 assigned to the right channel.
This would allow both IFB channel 2 and
“spotter” audio to be heard in the head-
phone’s right-channel output. To achieve
this would require that switches SW2-3,
SW2-6, and SW2-9 be placed in their
on positions.
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
is 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
this occurs is when on-air talent needs to
have a headset’s boom microphone come
across the right side of their face, rather
than the more-typical left side. In this case
it’s important to select the left- and right-
channel headphone source assignment
accordingly. With the Model 233’s flexible
source selection there’s no reason why
users, such as on-air talent, shouldn’t
have their cue sources assigned correctly.
Special applications may benefit from
using the Model 233 in a 3-channel head-
phone output mixer mode. This is accom-
plished by first configuring the headphone
output to monaural. (Details on how to
accomplish this are described later in this
section of the user guide.) Next the cue
sources are selected. The source whose
level is to be adjusted by the rotary con-
trol on the far left side of the front panel is
assigned to the left channel. Then the cue
source whose level is to be adjusted by
the center control is assigned to the right
channel. Finally the sidetone source can
be assigned to either of the channels.
(If it’s assigned to both there won’t be an
issue except that the level will increase by
6 dB.) During operation the user will then
be able to create their desired cue mix
using the three front-panel controls.
There may also be cases where a monau-
ral “single-muff” headset or headphone
will be connected to the Model 233’s
headphone output. In this case the de-
sired source(s) must be routed only to
the left channel. This is because the
2-conductor plug that’s typically associ-
ated with a mono headset or headphone
will connect only to the tip lead (left chan-
nel) of the headphone output. Signals
assigned to the right channel will not be
heard by the user.
Headphone Output Mode
Switch SW1-6 allows a monaural head-
phone output to be created. This is ac-
complished by summing (adding) the
selected left- and right-channel cue sig-
nals. The combined signals are sent to
both the left- and right-channel headphone
output driver circuits. The outputs of these
circuits connect, by way of 100 ohm series
protection resistors, to the headphone
output jack.
The headphone output monaural mode
feature was specifically included so that
a 3-channel headphone mixer mode can
be created. By enabling the mono mode,
the three front-panel user level controls
Figure 7. Headphone output mode settings