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Introduction
The HD1521 Powered Loudspeaker represents the
first step into portable high-definition live sound, provid-
ing precise, articulate full-range sound at the high-out-
put levels demanded of modern PA systems. Two Class-D
Fast Recovery™ amplifiers efficiently drive 1600 Watts
of total system power, providing maximum output with
minimal distortion. True high-definition sound is pos-
sible thanks to an arsenal of technological innovations
including our patented acoustic correction processing
that was previously only available on high-end stadium
touring systems. This complex processing, along with
a phase-coherent electronic crossover and transducer
time-alignment provide unparalleled acoustic accuracy
that has to be heard to be believed.
The 15” neodymium woofer and heat-treated titanium
compression driver are custom designed by the award
winning engineering team at EAW, delivering the ulti-
mate in both quality and performance. A user-adjustable
3-band contour EQ is built into the loudspeaker and
features a sweepable mid frequency for precise tonal
shaping.
All of these high-end components are housed in a
rugged, all-wood enclosure that not only protects, but
allows for multiple mounting options including flying
and pole mounting. The HD1521 brings high-definition
sound to the world of portable PA systems.
22.
Rigging Precautions: When mounting or suspending loudspeaker enclo-
sures, it is essential that load ratings, rigging techniques, and special
safety considerations be appropriate for the installation. Use only the
mounting/rigging points on the loudspeaker enclosure intended for
this purpose. The user must determine the load requirements, dynamic
loading, and any other contributing factors affecting the loudspeaker
installation. The user must determine the proper design factor for
specific applications and the required load rating of the connection to
structure. Comply with all applicable federal, state, and local regula-
tions.
We strongly recommend the following rigging system practices:
• Documentation: Thoroughly document the mounting/rigging
design with detailed drawings and parts lists.
• Analysis: Have a licensed structural engineer or other qualified
professional review and approve the mounting/rigging design
before its implementation.
• Installation: Use personnel experienced and qualified for mount
-
ing/rigging loudspeakers in accordance with and in compliance
with all federal, state and local regulations.
DANGER: Loudspeakers should be mounted or suspended only
by persons with knowledge of the proper hardware and rigging
techniques. When stacking or pole-mounting loudspeakers, be
sure that they are stabilized and secured from falling over or being ac
-
cidentally pushed over. Failure to follow these precautions may result
in damage to the equipment, personal injury, or death.
Features
• 1600W of ultra-efficient Class-D Fast
Recovery™ amplification
• LF 700W RMS / 1400W peak
• HF 100W RMS / 200W peak
• High-definition audio processing includes:
• Revolutionary patented acoustic correction
algorithms
• Transducer time alignment and phase
correction
• Precision 2-way crossover
• Custom designed transducers by EAW
• 15” neodymium woofer with 3” voice coil
• 1.75” compression driver with heat-treated
titanium diaphragm
• User-adjustable 3-band contour EQ with
sweepable mid-frequency
• Ultra-compact and lightweight
• Integrated limiting and protection circuitry
• Rugged all wood cabinet (15mm birch plywood)
• 12 integrated fly points for horizontal and verti
-
cal rigging
• Stand / pole mountable
Owner’s Manual
Owner’s Manual
Part No. SW0739 Rev. B 05/09
©2004-2009 LOUD Technologies Inc. All Rights Reserved.
Contents
IMPORTANT SAFETY INSTRUCTIONS 2
INTRODUCTION 3
FEATURES 3
HOOKUP DIAGRAMS 4
REAR PANEL FEATURES 5
PLACEMENT 7
ROOM ACOUSTICS 7
RIGGING 8
THERMAL CONSIDERATIONS 9
AC POWER 9
CARE AND MAINTENANCE 9
APPENDIX A: SERVICE INFORMATION 10
APPENDIX B: CONNECTIONS 11
APPENDIX C: TECHNICAL INFORMATION 12
HD1521 BLOCK DIAGRAM 13
HD1521 GRAPHS AND DIMENSIONS 14
HD1521 LIMITED WARRANTY 15