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Mackie SA1521 User Manual: Introduction; Rear Panel Description

2-way active speaker system.
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INTRODUCTION

Thank you for choosing a Mackie active
sound reinforcement speaker system.
The SA1521 is a high-efficiency, extreme
output, active two-way, wide dispersion,
sound reinforcement speaker system. The
SA1521 benefits from the integration of
500 watts of amplifier power, complete active
control electronics, and RCF Precision com-
ponents. These elements
together form a speaker
system with 100 dB of
sensitivity (@ 1 watt/
1 meter). The result is
unprecedented output,
resolution and clarity.
The components
inside the SA1521
incorporate several state
of the art advancements
in transducer technology.
These advancements
have been in develop-
ment for over two years.
The compression driver
is a new 1.75-inch
titanium diaphragm
design. It features a 3-slot, low-distortion
geometry phase plug. The amplifier for the
compression driver incorporates a Class AB
topology renowned for its clarity and warmth.
The low-frequency amplifier features an
innovative Class G hybrid topology. By
incorporating a high-frequency switcher
into the amplifier power supply design and
focusing the design effort into generating
the best possible "application-specific"
amplifier design, we arrived at a high-
efficiency amplifier that delivers 400 watts
RMS (continuous), and 600 watts peak at
100 Hz. It's quite capable of dealing with
REAR PANEL DESCRIPTION
MAIN INPUT
This is a female XLR-type connector that
accepts a balanced line-level signal from a
mixing console or other signal source.
LOOP OUT
This is a male XLR-type connector that
produces exactly the same signal that is
connected to the MAIN INPUT jack. Use it
to daisy-chain several SA1521s together off
the same signal source.
4
the high phase shift characteristics of large
diameter woofers.
More importantly, the amplifier incorpo-
rates the high-voltage output required to
generate extreme SPL levels. The SA1521
also features a low-distortion, high-output
horn design. This was developed to provide
the correct power response and phase
MAIN INPUT
0dB
SA1521
LOOP OUT
-15 +5
ACTIVE SOUND REINFORCEMENT
SPEAKER SYSTEM
CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC, WOODINVILLE, WA, USA
AND MACKIE EUROPE • COPYRIGHT ©2001 •
THE FOLLOWING ARE TRADEMARKS OR REGISTERED TRADEMARKS OF MACKIE DESIGNS INC.:
"MACKIE", AND THE "RUNNING MAN" FIGURE • PATENT PENDING
ON
CAUTION
WARNING:
THIS SURFACE MAY REACH HIGH TEMPERATURE DURING
STANDARD USE. TO ENSURE PROPER OPERATION ALLOW A MINIMUM OF 6 INS.
OF CLEARANCE FROM THIS SURFACE AND ADEQUATE VENTILATION. TO REDUCE
THE RISK OF ELECTRIC SHOCK DO NOT REMOVE THIS PANEL OR ANY ATTACHED
RISK OF ELECTRIC SHOCK
COMPONENT. NO OPERATOR SERVICEABLE PARTS INSIDE. REFER SERVICING TO
DO NOT OPEN
QUALIFIED PERSONNEL. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AVIS:
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
REPLACE WITH THE SAME TYPE FUSE AND RATING.
UTILISE UN FUSIBLE DE RECHANGE DE MÊME TYPE.
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
DEBRANCHER AVANT DE REMPLACER LE FUSIBLE
SERIAL NUMBER
MANUFACTURING DATE
a large aluminum heatsink. The signal in-
put panel contains:
• an input XLR and loop through XLR
• a volume level control
• Power On indicator
• Signal Present indicator
• Limit indicator
• Thermal protection indicator
The system accepts a standard line-level
signal via an XLR input connector.
The SA1521 cabinet is constructed using
both multi-layered plywood and pressure-
injected structural resin caps. The top and
bottom sections both have handles for easy
movement and relocation.
Level Control
This controls the overall signal level at the
input to the built-in power amplifiers. This
control ranges from –15 dB to +5 dB of
gain. The center detent is 0 dB (unity gain).
Power ON Indicator
When the power switch is turned on,
and the linecord is connected to an active
AC power supply, this indicator lights green
to let you know that you're ready to rock
and roll. The cool blue LED on the front of
the cabinet works in the same way.
alignment characteristics
at the crossover frequency.
Ultra-wide, controlled
dispersion performance
continues to be one of
POWER
Mackie Designs' most
SIGNAL
LIMIT
important engineering
THERMAL
goals for sound reinforce-
ment enclosures. With the
resulting 75º x 65º disper-
sion pattern, the SA1521
provides very open, natural
sound reproduction at
extreme output levels.
The rear mounted am-
plifier assembly features
separate signal and AC
power panels separated by

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