3
Part No. 820-062-10 Rev. 1 4/98
©1998 Mackie Designs, All Rights Reserved. Printed in the U.S.A.
Lend Me Your Ears
Exposure to extremely high
noise levels may cause per-
manent hearing loss.
Individuals vary considerably
in susceptibility to noise-induced hearing loss, but
nearly everyone will lose some hearing if exposed
to suffi-
ciently
intense
noise for a
period of
time. The
U.S.
Government’s
Occupa-
tional
Safety and
Health Ad-
ministration (OSHA) has specified the permissible
noise level exposures shown in this chart.
®
Duration Per Day
Sound Level dBA,
Typical
In Hours
Slow Response
Example
8
90
Duo in small club
6
92
4
95
Subway Train
3
97
2
100
Very loud classical music
1.5
102
1
105
Lori screaming at Ron about deadlines
0.5
110
0.25 or less
115
Loudest parts at a rock concert
According to OSHA, any exposure in excess of
these permissible limits could result in some hear-
ing loss. To ensure against potentially dangerous
exposure to high sound pressure levels, it is recom-
mended that all persons exposed to equipment
capable of producing high sound pressure levels
(such as this amplification system) use hearing
protectors
while this
unit is in
operation.
Ear plugs
or protec-
tors in the
ear canals
or over the
ears must
be worn
when oper-
ating this amplification system in order to prevent
a permanent hearing loss if exposure is in excess of
the limits set forth here.
INTRODUCTION
amplifier to handle is clipping. Conventional
designs use lots of negative feedback to provide
stability and lower distortion. When clipping
occurs, this “feedback” causes high-frequency
sticking, keeping the amplifier “latched” in the
clipping state longer than necessary. This re-
sults in painfully audible distortion. Our Fast
Recovery design eliminates this high-frequency
sticking and allows the amplifier to remain
stable when powering highly reactive loads at
high volume levels.
You may wonder why a power amp even
needs an owner’s manual. After all, you just
plug in a few cables and power it up. Well, it’s
almost that simple. There’s just a few things
that we’d like you to be aware of, and we’ll dis-
cuss those right away — please see the
Quick
Start
on the next page.
Then go ahead and read the entire manual.
The M•1400i amplifier has a wealth of useful
features, and each of them is explained in de-
tail.
Please write your serial number here for
future reference (i.e., insurance claims,
tech support, return authorization, etc.):
Purchased at:
Date of purchase:
Thank you for choosing a Mackie Designs
power amplifier! We appreciate your vote of
confidence for the folks in Woodinville who
specialize in awesome and affordable audio.
The Mackie Designs M•1400i power amplifier
is designed to fulfill the amplification needs of
almost any type of application. It boasts a wealth
of features you’d expect to pay extra for — like
subwoofer filtering, constant directivity equal-
ization, speaker-protecting limiter, and gobs of
ultra-clean power, to name a few.
Perhaps the most important feature of the
FR Series™ Power Amplifiers is the attention
to detail in every aspect of the design. At Mackie,
we know what it takes to be roadworthy. After
all, our mixers have traveled all over the world
under the worst of conditions, and we’ve applied
what we’ve learned to the mechanical design of
our amplifiers.
Roadworthiness is only part of the picture.
We know that reliability is paramount to sound
reinforcement. That’s why we use double-sided
thru-hole-plated fiberglass printed circuit boards.
That’s why our engineers have subjected the ampli-
fier to the most rigorous and punishing tests
imaginable, to fine-tune the design and extend
its limits beyond those of ordinary amplifiers.
Fast Recovery — where the “FR” comes
from — is more than a buzzword. It is based on
real, proven design principles. The result is an
amplifier that performs better than conventional
designs when presented with adverse conditions.
One of the most difficult things for a power
