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Headphone Monitoring
As illustrated by the Block Diagram, the headphones output a mono signal,
combining both the right and left channels into each of the headphone earcups.
At high gain, the small consumer-grade headphone amp can produce a lot of
noise. Fortunately, for most circumstances where the camera gain has been
throttled back (either manually, or by the AGC Disable feature), the signal level is
relatively high, so the headphone gain can be turned down where the headphone
amp noise is relatively low.
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Playback Headphone Monitoring
As illustrated by the Block Diagram, the headphones output a mono signal,
combining both the right and left channels into each of the headphone earcups.
To use the headphone amplifier for playback monitoring (playing back the clip in
your camera, and using the DT454 to monitor the audio), set the DT454 with the
following configuration:
•
TIP-L / RING-R GAIN set to LO
•
Turn down the PHONES volume control all of the way.
•
Use the TIP-L / RING-R TRIM (volume control knobs) as the volume control
for the headphones.
Plug the camera’s AVout into the DT454 TIP-L / RING-R input. The AVout jack
has 4 contacts, so you can’t use a standard 3 contact stereo miniplug cable.
Custom cables can be made. Alternatively, many cameras come with an AVout to
RCA cable. You can use an inexpensive Stereo 3.5mm Male to 2x RCA Female
Y Cable (see Hosa part numbers YRA-167 and YRA-154):
If the NOISE AGC Disable approach was used, then simply do not plug in the right
(red) channel, since this will be abandoned anyhow.