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30 VLZ3 4•Bus
TRS Send/Receive Insert Jacks
Mackie’s single-jack inserts are the three- conductor,
TRS 1⁄4" phone type. They are unbalanced, but have
both the mixer output (send) and the mixer input
(return) signals in one connector. See Figure F.
The sleeve is the common ground (earth) for both
signals. The send from the mixer to the external unit is
carried on the tip, and the return from the unit to the
mixer is on the ring.
Using the Send-only on an Insert Jack
If you insert a TS (mono) 1⁄4" plug only partially (to
the first click) into a Mackie insert jack, the plug will
not activate the jack switch and will not open the insert
loop in the circuit (thereby allowing the channel signal
to continue on its merry way through the mixer).
This allows you to tap out the channel signal without
interrupting normal operation.
If you push the 1⁄4" TS plug in to the second click, you
will open the jack switch and create a direct out, which
does interrupt the signal in that channel. See Figure G.
NOTE: Do not overload or short-circuit the signal you
are tapping from the mixer. That will affect the internal
signal.
“tip”
This plug connects to one of the
mixer’s Channel Insert jacks.
“ring”
tip
ring
sleeve
SEND to processor
RETURN from processor
(TRS plug)
Figure F
Direct out with no signal interruption to master.
Insert only to first “click.”
Channel Insert jack
Channel Insert jack
Channel Insert jack
Direct out with signal interruption to master.
Insert all the way in to the second “click.”
For use as an effects loop.
(TIP = SEND to effect, RING = RETURN from effect.)
MONO PLUG
MONO PLUG
STEREO
PLUG
Figure G