Input - Mackie M-2600 Owner's Manual

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
Hot (+) Pin 2
Cold (–) Pin 3
Shield (Ground) Pin 1
Balanced 1/4" TRS Plug
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.
Unbalanced 1/4" TS Plug
TRS
Tip
Ring
Shield
RING SLEEVE SLEEVE RING TIP
TIP
RING (COLD)
TIP (HOT)
SLEEVE (SHIELD)
SLEEVE SLEEVE TIP
TIP
RING (COLD)
TIP (HOT)
SLEEVE (SHIELD)
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