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SHORT
If this LED comes on, the M•2600 has de-
tected a short circuit in either of the outputs,
meaning that the positive (+) and negative (–)
speaker wires are touching, or a speaker itself
is shorted out. Such a condition causes the
M•2600 to engage its
PROTECT
mode
(when a signal is present), muting all signals
at the amp’s outputs.
This short-circuit LED is a Mackie exclusive
(until the other guys “borrow” the idea) and
can save precious minutes of your trouble-
shooting time. Without it, you’d still have
speaker and amp protection (via the
PROTECT
circuit), but you wouldn’t be able to determine
the source of the problem. But with the
SHORT
LED, the M•2600 comes right out and tells you!
WARNING: The
SHORT
LEDs indicate an unsafe
condition for the power
amplifier. When the short-
circuit protection is acti-
vated, the
SHORT
LED
lights, then the
PROTECT
LED lights. After
about four seconds, the protection circuit turns
off and the amplifier resumes normal operation.
If it senses the shorted condition again, the
cycle repeats until you fix the problem.
Typical causes for a “short” indication would
be either a shorted speaker cable or too many
speakers connected to the amplifier (i.e., the
load impedance is too low). If a “short” is indi-
cated, please check your cables. If the cabling
is OK, then reduce the number of speakers
driven by the amplifier.
POWER
PROFESSIONAL POWER AMPLIFIER
SIG
SIG
(short for “signal present”) is the lowest
step in the meter
ladder. It senses the signal
prior to the
GAIN
control, so when
SIG
is lit,
you know the M•2600 is receiving signal. If it’s
the only meter LED lit (meaning the other meter
LEDs are not lit), the M•2600 is receiving a
very weak signal (below –20 dB).
PROTECT
If the
PROTECT
LEDs are on, the M•2600’s
output section has shut down. That, of course,
means you won’t hear anything until you rectify
the situation. Three things can cause the
PROTECT
circuit to engage:
• Powering up the M•2600. A built-in delay
circuit saves your speakers (and ears)
from the thumps or pops that can some-
times occur when powering up a system.
During this 4-second delay, the
PROTECT
LEDs light up.
• A short circuit (or near short) in either of
the outputs. Both the
PROTECT
and the
SHORT
LEDs light up.
• The temperature in the M•2600 has risen to
an unsafe level. The
PROTECT
and the
TEMP STATUS HOT
LEDs light up.
The M•2600 amp draws its
ventilation air in from the
front and out through the
side panels. The amp
needs plenty of fresh air to
stay cool. DO NOT BLOCK
THE VENTILATION PORTS. See
“Thermal
Considerations,”
on page 29.