Sub Outs; Sub Inserts - Mackie SR24•4 Owner's Manual

STEREO OR MONO PATCHING
For stereo operation in channels 21–24,
(29–32) just plug balanced
sleeve) or unbalanced / " TS (tip-sleeve) left
1
4
and right phone plugs into the left and right
jacks. If you only have a mono source, insert
that plug into the "L (MONO)" input jack[5].
With no plug in the "R" jack, an internal jack
switch will automatically route the signal
(normalled) in the "L" jack to both the left
and right circuits of the channel strip for
mono operation.

SUB OUTS

The four submix buses of the SR24•4 ap-
pear at the eight SUB OUT jacks [6]. Each
submix bus is wired to two jacks: Bus 1 to
jacks 1 and 5, Bus 2 to jacks 2 and 6, Bus 3 to
jacks 3 and 7, and Bus 4 to jacks 4 and 8.
The SUB OUT jacks are impedance-bal-
anced 1/4" TRS (tip-ring-sleeve) phone jacks,
with tip wired to "hot" (or "high" or "+"), ring to
"cold" (or "low" or "–") and sleeve to ground.
These jacks are also wired to accommodate un-
balanced 1 / " TS connections. The nominal line
4
level at the SUB OUT jacks is 0dBu.
A CLOSER LOOK: Why are
there 8 submix output
jacks on a 4 submix mixer?
This is called "double-bus-
sing." When you send a
signal to submix 1, for in-
stance, it will appear at SUB OUT 1 and
MAIN OUTS AUX SENDS
L 1
R 2
3
L
R
R
MAIN INSERTS CONTROL ROOM OUT
SUB OUT 5. The tracks on your multitrack
recorder which are in RECORD mode will
accept the signal, while the tracks in SAFE
1 / " TRS (tip-ring-
4
mode won't. That way, you can feed an 8-
track recorder without having to constantly
repatch your input cables.

SUB INSERTS

To the right of the SUB OUT jacks are
the submix INSERT jacks [7]. These patch
points allow you to insert a processing de-
vice, such as a compressor or an equalizer,
into any of the SR24•4 submix circuits. The
insert point is after the AIR control but
before the submix fader.
Just like the channel insert, each submix
insert is made through a
The inserts offer both an unbalanced chan-
nel send or out, and an unbalanced channel
return on the same jack. The nominal insert
send and return level is 0dBu, and the insert
return clipping point is +22dBu.
The sleeve of the jack is connected to
ground and is also the common ground con-
nection for both insert send and return
signals. The tip is the insert send signal and
the ring is the insert return signal.
STEREO AUX RETURNS
4
R
1
5
R
2
R
6
3
L R
4
(MONO)
1 / " TRS phone jack.
4
NOTE: These inserts can
be used as pre-fader
submix outputs, using
an unbalanced 1
phone plug in one of
these two ways:
SUB OUTS
L
1
5
L
2
6
L 3
7
L 4
8
and Function
/ " (TS)
4
SUB INSERTS
1
2
3
4
29
Layout