Section 1. Introduction And System Overview - JBL HLA 4895 Owner's Manual

HLA System Owner Manual
Section 1. - INTRODUCTION AND SYSTEM OVERVIEW
Congratulations on purchasing the latest in sound reinforcement speaker technology from JBL
Professional. HLA's high acoustical power output capabilities and pattern-controlled coverage characteristics
allow fewer speakers to achieve superior results with significant weight savings when compared to systems that
rely on traditional speaker technology. HLA's superior performance is derived from not one, but a collection of
several new technologies, each offering a unique advantage over conventional speaker designs.
HLA's New Technologies
Differential Coil Drive (DCD) New voice coil and motor assemblies have twice the thermal surface area of
traditional speakers. This enables HLA systems to provide higher peak output with less power compression, better
heat dissipation and a flatter impedance curve at higher frequencies. These transducers are one-third the weight
of a traditional speaker, with 16-ohm impedance ratings which enable more efficient use of today's high-powered
amplifiers.
Direct cooling of DCD drivers provides a simple method for greater thermal transfer of heat away from the voice
coil. This allows for long-term high-power operation.
Composite magazine A non-wood speaker enclosure made of space-age man-made material contributes lighter
overall system weight and improved rigidity. Benefits include better transducer loading for low distortion, direct
cooling, and weather resistance.
MultiBand Waveguide TM Triple-section horn combines low, midrange and high-frequency waveguides into a
single device, offering wide-band acoustical pattern control with low distortion, and reduced interference from
adjacent elements. The benefit: better-sounding loudspeaker arrays.
Spaceframe TM A rigid aluminum frame structure that distributes weight and lifting stress, enabling pull tests of
25,000 pounds (11,400 kg) without failure or structural deformation. The Waveguide is tiltable within
Spaceframe.
Linear Dynamics Aperture TM
traditional subwoofer port designs. At 25 Hz, this provides for 8 dB less port compression at full output, and offers
3 dB greater output than conventional subwoofers. Approximately one-half the number of HLA Model 4897
subwoofers will typically be required for equivalent acoustical output compared to conventional subwoofers.
Any of the above technical innovations would give a sound system a competitive advantage. JBL's HLA
system combines them to provide an unprecedented high-performance package for portable sound
reinforcement.
Contoured subwoofer ports virtually eliminate high-level turbulence found in
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