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Ordinarily, applying a positive
voltage to a speaker’s positive
input and negative voltage to
the negative input results in
an outward excursion of the
woofer. But some woofers are
built with reverse polarity, meaning that the
above conditions result in an inward excursion.
If you’re not sure which type of speakers you
have, take a look at their literature. If you’re
still not sure, here is a simple test: remove the
speaker wires from the back of the speakers,
then take a 1.5V flashlight battery and connect
the positive terminal of the battery to the posi-
tive (+) input of the speaker, and connect the
negative terminal of the battery to the negative
(–) input of the speaker. Observe the motion of
the speaker cone. It should move out when volt-
age is applied, and return to rest when voltage
is removed. Make sure all the speakers in the
system move in the same direction (there are
a few exceptions — some speakers are deliber-
ately designed with reverse-polarity woofers).
INPUT
The M•2600 amplifier gives you a choice —
it has the traditional XLR inputs, as well as 1/4"
TRS (tip-ring-sleeve) input jacks. Sonically
(and electrically) they’re identical, so choose
either one, but do not use both at the same
time to send signals into the M•2600.
Each can be used with either balanced or
unbalanced signals.
When connecting a balanced signal using the
XLR or 1/4" jacks, they’re wired as shown, per
AES (Audio Engineering Society) standards:
XLR TRS
Hot (+) Pin 2 Tip
Cold (–) Pin 3 Ring
Shield (Ground) Pin 1 Shield
STEREO
TYPICAL
1
CHANNEL
S
U
B
W
O
O
F
E
R
TYPICAL
35 Hz
CHANNEL
2
ON
TYPICAL
IN
IN
LOW CUT FILTER
INPUT
INPUT
CROSSOVER
SWITCHED OUTPUT
SWITCHED OUTPUT
BALANCED
OR
UNBALANCED
170 Hz
100 Hz
OFF
STAGE
MONITOR
90Hz
LOW
OUT
HIGH
OUT
THRU
LOW
OUT
HIGH
OUT
THRU
120Hz
60Hz
CROSSOVER
90Hz
120Hz
60Hz
AMP MODE
B
R
ID
G
E
D
M
O
N
O
OUTPUT APPLICATION
BALANCED
OR
UNBALANCED
LIMITER
(CH1 & CH2)
LOW OUT
(SUB WOOFER)
OFF
CH's
SUMMED
FULL
RANGE
LOW CUT FILTER
170 Hz
100 Hz
OFF
STAGE
MONITOR
S
U
B
W
O
O
F
E
R
TYPICAL
35 Hz
THRU
THRU
SLEEVE (SHIELD)
TIPSLEEVE
TIP (HOT)
RING (COLD)
RING
TIP
SLEEVERING
TIPSLEEVE
TIP
SLEEVE
SLEEVE (SHIELD)
TIP (HOT)
RING (COLD)
Unbalanced TS (tip-sleeve) lines can be
accommodated 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.
Balanced 1/4" TRS Plug
Unbalanced 1/4" TS Plug