Mackie M1200/M1400 Owner's Manual page 17

When connecting a balanced signal using
the XLR or 1/4" jacks, they're wired thusly, per
AES (Audio Engineering Society) standards:
XLR
Hot (+) Pin 2
Cold (–) Pin 3
Shield (Ground) Pin 1
Balanced XLR Connectors
RING SLEEVE
TIP
Balanced 1 ⁄ " TRS Plugs
4
1
CHANNEL
/ BRIDGE / MONO
INPUT
LOW CUT
FILTER
BALANCED
TYPICAL OR
35 Hz UNBALANCED
STAGE
MONITOR
100 Hz
OFF 170 Hz
CONSTANT DIRECTIVITY
HORN EQ /AIR EQ
4.5 k Hz
ON
2k Hz 5.6k Hz
AIR EQ OFF
AIR EQ
TYPICAL
Unbalanced TS (tip-sleeve) lines can be ac-
commodated via the TRS jack. Make sure the
cord terminates with a TS plug (like a guitar
plug), or if it's a TRS plug (like a headphone
TRS plug), make sure the ring is tied to the shield,
Tip preferably at the source.
Ring
Shield
2
SHIELD
HOT
1
COLD 3
Unbalanced 1/4" TS plug
SHIELD
1
You can connect an unbalanced XLR cable
to the M•1200/M•1400, although this would be
COLD 3
2
HOT unusual — as unusual as an unbalanced XLR
SHIELD
1
output. However, if you have an unbalanced
3
COLD
XLR connection to make, refer to the "Connec-
2
HOT
tors" section (Appendix C) at the back of this
manual for more information.
The M•1200/M•1400 amps expect to see
a nominal signal level anywhere between the
SLEEVE RING TIP
–10dBV "semipro" and +4 dBu "pro" standards,
meaning almost any line-level mixer or other
device can be plugged into the amp's INPUTs.
RING (COLD)
Use the GAIN
TIP (HOT)
the amplifier to match the signal level you're using.
SLEEVE (SHIELD)
AMP MODE
MONO
STEREO
TYPICAL
OUTPUT APPLICATION
FULL SUB
WOOFER
RANGE
LIMITER
(CH1 & CH2)
STEREO
TYPICAL
ON OFF
THRU
SLEEVE
TIP
controls to adjust the gain of
If you set the AMP MODE
switch in MONO or
BRIDGE, use the CHAN-
NEL 1 inputs only — the
CHANNEL 2 inputs are
disabled in this case.
INPUT
BALANCED
OR
UNBALANCED
FREQUENCY
125Hz
ON
63Hz
OFF
TYPICAL
THRU
SLEEVE TIP
RING (COLD)
TIP (HOT)
SLEEVE (SHIELD)
2
CHANNEL
LOW CUT
FILTER
TYPICAL
35 Hz
STAGE
MONITOR
100 Hz
OFF 170 Hz
CONSTANT DIRECTIVITY
HORN EQ /AIR EQ
4.5k Hz
2k Hz 5.6k Hz
AIR EQ
AIR EQ
17