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frequency boost to compen-
sate for the natural roll-off
inherent in all compression
drivers. Some speaker manu-
facturers provide external
processors with plug-in
modules for each of the
various combinations of
horns and drivers (at an
additional cost to you!) to
compensate the CD horns.
Each channel of an FR
Series power amplifier has
its own built-in CD horn
compensation circuit. All you
need to do is set the variable-
frequency horn EQ control on
the amplifier to the manu-
facturer’s recommended mass
breakpoint frequency (the
point where the frequency
response begins to roll off).
As an added feature, if you’re
not using CD horns, set the
frequency control fully clock-
wise to the AIR setting to en-
joy Mackie’s exclusive AIR
EQ, a gentle high-frequency
boost that brightens and
lightens the sound.
Low-cut filter.
Virtually all loudspeakers
have a low-frequency cutoff
point somewhere above
20Hz. Many low-frequency
drivers have a –3dB point
at 35Hz to 40Hz, while many
stage monitor speakers cut
off at about 100Hz; there’s
no sense in amplifying low-
frequency signals that the
loudspeaker cannot reproduce.
Each channel of the FR
Series amplifiers has a con-
tinuously variable low-cut
filter. Simply dial in the fre-
quency at which the loud-
speakers drop off (anywhere
from OFF to 170Hz), and
reap the benefits of saving
amplifier power with
cleaner, tighter bass.
Built-in subsonic stabilizer.
Even with the low-cut
filter set to the OFF position,
each channel of the FR Series
amplifiers has a built-in
subsonic stabilizer (technically
called infrasonic stabilizer).
This dampens the very low
frequencies, which can be
caused by microphone
handling or stage rumble.
These frequencies are below
the threshold of human
hearing, and rob the amplifier
of power and contribute to
intermodulation distortion.
Protection circuits.
Both amplifiers are
equipped with a number of
unique and innovative protec-
tion circuits to ensure the
safety of your speakers and
the amplifiers.
Separate left and right
Protect LEDs on the front
panel indicate when a protec-
tion circuit has been activated.
For example, when the am-
plifier is first turned on the
outputs are muted for three
seconds, during which time
the Protect LEDs are lit. This
allows time for all the equip-
ment in the system to power
up and stabilize, and prevents
potentially damaging thumps
or pops from propagating
to the speakers.
Separate left and right
Short LEDs indicate if there
is a short circuit at the
speaker output terminals.
This lets you know at a glance
to check the speaker wiring
for shorts (or recalculate the
speaker load impedance)
right from the get-go, so you
don’t waste precious time
searching for the problem.
Combined left and right
Cold and Hot LEDs indicate
if the amplifier has overheated.
Under normal operation,
the Cold LED remains lit. If
the Hot LED should light,
the outputs become muted
until the amplifier cools to
a safe operating temperature,
then normal operation ensues.
The FR Series: The most
affordable, full-featured
power amplifiers available.
As you can see, there is
every reason the M•1200
and M•1400 are fast becoming
the premier affordable choice
for many sound reinforcement
and recording applications.
With their proven durability,
professional features and
specs, and certainly not least,
low cost – the FR Series is
destined to be a classic.
There are no other power
amplifiers in their class with
all these features at such
an affordable price.
And that’s why people
from all professions, with
all kinds of different applica-
tions, prefer Mackie’s FR Series.
You’ll like them because of
their low price, easy-to-use
features, and rugged construc-
tion. That’s got to sound good.
And, of course, Mackie does.