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30 Onyx 1640i
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 fi rst 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
DB25 Connectors
The Recording Outs on the back of the Onyx 1640i
provide balanced direct outputs for channels 1-16 on
two female DB25 connectors. These connectors are
pin-for-pin compatible with the analog (not TDIF) DB25
connectors found on TASCAM DTRS recorders, which
has become an industry standard for many professional
audio manufacturers. They are also the same pinout
as the analog cards for the Mackie D8B and hard disk
recorders.
Several companies make DB25-to-DB25 cables
specifi cally for audio, with proper shielding to reduce
crosstalk and noise.
DB25 cables that break out to XLR, 1/4" TRS, or
TT connectors for connecting to other mixers or audio
gear are also readily available. See your Mackie dealer
for details.
Pin 1 + Ch 8 Ch16
Pin 2 shield Ch 8 Ch16
Pin 3 – Ch 7 Ch15
Pin 4 + Ch 6 Ch14
Pin 5 shield Ch 6 Ch14
Pin 6 – Ch 5 Ch 13
Pin 7 + Ch 4 Ch 12
Pin 8 shield Ch 4 Ch 12
Pin 9 – Ch 3 Ch 11
Pin 10 + Ch 2 Ch 10
Pin 11 shield Ch 2 Ch 10
Pin 12 – Ch 1 Ch 9
Pin 13 N/C
Signal
Description
REC OUTS
1-8
REC OUTS
9-16
REC OUTS
1-8
REC OUTS
9-16
Pin 14 – Ch 8 Ch16
Pin 15 + Ch 7 Ch15
Pin 16 shield Ch 7 Ch15
Pin 17 – Ch 6 Ch14
Pin 18 + Ch 5 Ch 13
Pin 19 shield Ch 5 Ch 13
Pin 20 – Ch 4 Ch 12
Pin 21 + Ch 3 Ch 11
Pin 22 shield Ch 3 Ch 11
Pin 23 – Ch 2 Ch 10
Pin 24 + Ch 1 Ch 9
Pin 25 shield Ch 1 Ch 9
Signal
Description
12345678910111213
141516171819202122232425
HOT
COLD
GROUND
HOT
COLD
GROUND
HOT
COLD
GROUND
HOT
COLD
GROUND
HOT
COLD
GROUND
HOT
COLD
GROUND
HOT
COLD
GROUND
HOT
COLD
GROUND
CH 1
CH 9
N/C
CH 2
CH 10
CH 3
CH 11
CH 4
CH 12
CH 5
CH 13
CH 6
CH 14
CH 7
CH 15
CH 8
CH 16
Figure H