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17
When connecting a balanced signal using
the XLR or 1/4" jacks, they’re wired thusly, per
AES (Audio Engineering Society) standards:
XLR TRS
Hot (+) Pin 2 Tip
Cold (–) Pin 3 Ring
Shield (Ground) Pin 1 Shield
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
plug), make sure the ring is tied to the shield,
preferably at the source.
CHANNEL
2
1
CHANNEL
63Hz
125Hz
CONSTANT DIRECTIVITY
HORN EQ /AIR EQ
CONSTANT DIRECTIVITY
HORN EQ /AIR EQ
INPUT
THRUTHRU
INPUT
AMP MODE
FREQUENCY
4.5 k Hz
ON
5.6k Hz
2k Hz
MONO
BRIDGE
LIMITER
(CH1 & CH2)
OFF
FULL
RANGE
SUB
WOOFER
LOW CUT
FILTER
LOW CUT
FILTER
OUTPUT APPLICATION
BALANCED
OR
UNBALANCED
BALANCED
OR
UNBALANCED
AIR EQ
ON
/ BRIDGE / MONO
170 Hz
OFF
4.5k Hz
5.6k Hz
2k Hz
AIR EQ
170 Hz
100 Hz
OFF
STAGE
MONITOR
100 Hz
STAGE
MONITOR
OFF
TYPICAL
ON
OFF
TYPICAL
TYPICAL
35 Hz
TYPICAL
35 Hz
STEREO
TYPICAL
STEREO
TYPICAL
AIR EQ
AIR EQ
2
2
3
1
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1
SLEEVE (SHIELD)
TIPSLEEVE
TIP (HOT)
RING (COLD)
RING
TIP
SLEEVERING
TIPSLEEVE
TIP
SLEEVE
SLEEVE (SHIELD)
TIP (HOT)
RING (COLD)
You can connect an unbalanced XLR cable
to the M•1200/M•1400, although this would be
unusual — as unusual as an unbalanced XLR
output. However, if you have an unbalanced
XLR connection to make, refer to the “Connec-
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
–10dBV “semipro” and +4 dBu “pro” standards,
meaning almost any line-level mixer or other
device can be plugged into the amp’s
INPUT
s.
Use the
GAIN
controls to adjust the gain of
the amplifier to match the signal level you’re using.
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.
Balanced XLR Connectors
Balanced
1
⁄
4
" TRS Plugs
Unbalanced 1/4" TS plug