JK Audio INLINE PATCH User Manual page 5

Operating (continued)
Output Jacks
The Inline Patch has three audio output jacks on the back
panel. The 3.5 mm "stereo" jack has the phone line audio on
the left channel and your voice on the right channel. The
second 3.5 mm jack has both sides of the call combined on
both left and right channels. You may use either a mono or
stereo plug in this jack. The third output is a balanced male
XLR jack. The XLR jack contains only the audio coming from
the phone line with a nominal 20 dB of trans-hybrid loss.
There are three output controls on the front of the Inline
Patch. From Phone adjusts the level of your voice on both
output mini jacks. "From Line" adjusts the level of the
audio coming from the phone line on all three output jacks.
The Separation control is used to achieve the best match
between your voice and the audio coming from the phone
line. When you send your voice into the phone line it
comes back to you mixed in with the audio from the other
side of the call, although it will be about 20 dB lower than
your original transmit level. This means that if your audio
is sent at 0 dB, and you receive the caller's audio at 10 dB,
then you would have 10 dB of separation between your
voice and the caller audio. The goal is to have a minimum
amount of your voice coming back to you from the phone
line. To fine tune the separation, first connect your audio
equipment (powered speakers, mixer w/ VU meter, etc.) to
the mixed mono output jack on the back of the Inline
Patch. Next turn the From Phone control all the way down
and the From Line control all the way up. Now place a
phone call. Without any audio coming from the other end
of the call, hold down a touch tone on your telephone
while adjusting the Separation control to find the most
quiet position. Now turn the From Line control to about
12:00 and use the From Phone control to bring your voice
up to a suitable level.
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