At JBL, audio technology is at the core of everything we do. For 70 years we have employed the best methodology and tools, and, as established at the very beginning by our founder, James B. Lansing, we develop everything from the ground up. This not only ensures success in the marketplace, it guarantees our efforts exceed the needs and expectations of audio professionals throughout the world. Never straying from this exacting formula, our journey has produced a prolific list of audio achievements, groundbreaking technologies, revolutionary advances in the art and science of professional audio, many patents, and many awards. It’s a journey that is legendary worldwide and has positioned JBL as the world leader in professional audio. Not just as a brand, but as a company known for consistently blending creativity and science as a manifestation of our passion for sound and our commitment to those who create it. Purposeful invention is no accident. It requires leadership, persistence and an unfaltering commitment to JBL’s ultimate design goal: create the best tools for better, more accurate sound. The technologies highlighted in these pages are not only part of a lasting legacy, they are at work every day at the core of all JBL products used by audio professionals worldwide..
Enhanced Performance & Dramatically Reduced Driver Weight
Differential Drive technology delivers better heat dissipation, lower power compression and higher dynamic range versus conventional single-coil designs. In addition, magnetically saturated pole-pieces and an aluminum shorting ring significantly reduces nonlinear distortion.
Patented Differential Drive® Dual Voice-Coil & Magnetic Gap neodymium-magnet cone transducers
Engineering Precision Delivers Higher Power and Better Performance
JBL engineers wanted to solve the persistent challenge of all professional audio applications: how to increase performance while reducing overall system size and weight so that touring sound companies and working sound engineers alike could deliver unparalleled performance with their systems while reducing overall handling, transportation, and setup costs. The solution was a creative reconfiguration of the basic elements of the low frequency driver. Heat sinks are integrated into the driver's cast aluminum frame, and the neodymium magnets are placed inside the driver's dual voice coil assembly, completing the magnetic circuit without the heavy surrounding steel structure of conventional drivers. While dramatically reducing driver weight, all critical performance parameters are greatly enhanced: frequency response, power output and distortion. The resulting sound quality is extraordinarily transparent, even at very high SPL, while system weight and physical footprint can be reduced by as much as half when compared to conventional speaker systems. JBL's exclusive dual voice coil, dual magnetic gap Differential Drive technology is now at the core of a full range of woofer models incorporated in many JBL loudspeaker systems from touring sound and fixed installation, to studio and cinema sound.
Patented CMCD Cone Midrange Compression Driver
Throughout the history of professional audio it has been realized there are distinct performance advantages to compression and horn-loading a midrange transducer. The advantages include increased sensitivity and bandwidth, desirable pattern control, and arrayability - all provided by horn-loading. Other advantages include reduced harmonic and inter- modulation distortion, and increased maximum SPL.
High-Linearity Mid-range Cone Transducer
CMCD models include the CMCD-81J, CMCD-81H, and the CMCD-61H. Each CMCD assembly incorporates a JBL cone midrange driver, a 3 slot annular-ring phasing plug, and a thermally conductive rear chamber. An optimal 4-inch exit-diameter and a correct exponential expansion provide excellent coupling to the entire family of Progressive TransitionTM midrange wave guides.
Dual Diaphragm Dual Voice Coil Compression Driver
The revolutionary D2 Dual Driver dramatically improves the sound and performance of high frequencies, providing an extreme output advantage over conventional systems with significantly higher array power, reduced distortion, double the number of voice coils and more than double the power handling. This results in a dramatic increase in pure high frequency sound pressure levels in the same physical footprint with a 30% reduction in weight.
The Realization of Engineering Exellence
A revolutionary device that merges two compression drivers into a single compact transducer, establishing a new benchmark for pure high frequency output and low distortion. Dual Diaphragms Provide Increased Radiating Area for Higher Output
Image Control Waveguide
Unprecedented Detail, Vivid Imaging,and a Room-Friendly Broad Sweet Spot
The unique geometry of this waveguide delivers remarkable high frequency detail, imaging, and natural balance at nearly any listening position in a broad range of acoustic environments. Since design of this complexity and level of detail is an iterative process, JBL performs Finite Element Analysis, creating virtual simulations of off-axis response, pattern control, and the blend of the high frequency driver and woofer.
Impressive Imaging and Sound Stage, Exceptional High Frequency Detail, Uniform Directivity for Smooth In-Room Response, Patent Pending Design
Increased High Frequency detail
The Image Control Waveguide was developed for JBL's new flagship M2 Master Reference Monitor and with the introduction of the JBL 3 Series, is now available for the first time in an affordable, compact reference monitor. Its patent-pending design precisely controls the sound emanating from the speaker in the vertical and horizontal planes ensuring the representation of your mix is neutral and accurate at the listening position.
Low Frequency Port
The patented JBL low frequency port design works in concert with the 3 Series woofer for accurate bass response at all playback levels. The double-flared shape of the port is precisely calculated for greater low-frequency extension and reduced turbulence.
Progressive Transition™(PT) Waveguides
Balanced frequency response, pattern control, and distortion, improved sound reproduction.
Progressive Transition Waveguides provide excellent coverage control and are rotatable so the loudspeaker system can be used in either the vertical or horizontal orientation.
An Introduction to Progressive Transition Waveguides:
The modern constant-directivity horn has evolved slowly since its introduction over 25 years ago. Advances in horn design have been primary evolutionary in nature. To achieve balanced response of all parameters, JBL Professional started with a clean sheet of paper and developed Progressive Transition (PT) Waveguides.
Progressive Transition waveguides are unique because a single mathematically-continuous surface defines the waveguide from transducer- throat to waveguide-mouth. The distinctive feature is the lack of a traditional diffraction slot. Instead the sidewalls transition smoothly from the driver throat through to the square or rectangular mounting flange.
Progressive Transition Waveguide Families
PT waveguides are grouped into two families. The first is “compact”, and second is “optimized cover- age/rotatable”. Compact PT waveguides balance performance in favor of small overall package size. Frequency response is optimal, distortion is superbly low, depth is minimized for use where a shallow enclo- sure is required. Beamwidth and directivity are optimal in the horizontal plane. Vertical beamwidth and directivity are optimized to provide a good match with JBL low frequency and midrange transducers; however, vertical pattern control does not extend as low as optimized coverage PT waveguides.
VTX V25-II WaveGuide
Improved Wavefront Control
The V25‐II waveguide provides better acoustic loading conditions for the D2 driver, resulting in 10 dB higher sensitivity above 10 kHz. This sensitivity increase means that less high frequency (HF) shelving equalization is required in order to achieve the same acoustic output response and, as a result, there is a significant increase in amplifier headroom. Limiter thresholds can also be adjusted so there is less peak limiting activity and reduced distortion. All of this combines to provide higher maximum SPL and improved system packaging density since there is a better power match when V25‐II is used with Crown Audio IT4x3500HD four channel amplifiers.
Radiation Boundary Integrator™ (RBI)
Improved Broader & More Stable Horizontal Coverage
JBL’s patented Radiation Boundary Integrator combines the high frequency and mid-range so the transition across each band is uninterrupted, undistorted and seamless. A patented, tuned resonant-chamber is integrated into the waveguide itself, effectively eliminating throat-related cancellations due to back pressure from the mid-range section. Our refined RBI waveguide implementation provides improved horizontal coverage - broader and more stable
Constant Curvature Waveguide
Enable multiple drivers to work together acoustically as a single driver.
The challenge in designing a world-class line array is to create a controlled, coherent coverage pattern regardless of the number of cabinets used in the array. JBL’s Constant Curvature Array Design does that and more. Our waveguide mounts three compression drivers on a continuous arc enabling them to work together acoustically as if they were a single driver, while dramatically increasing the power handling and acoustic output when compared to a single driver system. Additional enclosures can be added creating an uninterrupted, continuous arc with all of the drivers working together seamlessly as if they were one driver on a very long waveguide. This innovative technology provides unprecedented output coherence and stunning, clear high-frequency sound quality regardless of the configuration.
Crossfired Waveguide Technology (CWT)
Even response throughout the frequency spectrum.
Crossfired Waveguide Technology delivers evenly dispersed sound across a wide coverage area without the interference and uneven sound fields produced by the typical approach of two speaker systems firing at cross angles. The dual function CWT Waveguide is loaded with two compression drivers mounted to create a seamless, 160 degree, full bandwidth coverage pattern. Its small footprint provides dramatically improved performance in about one third the space with reduced cabinets, cabling, mounting hardware, setup time, and overall cost.
Wide Coverage Waveguide
The CWT Waveguide features a wide coverage pattern designed to provide seamless horizontal coverage across a full 160°. Based on JBL patented technology, the CWT Waveguide is essentially split in half and loaded with two compression drivers facing in different directions. The waveguide delivers wide angle coverage in a single enclosure, exhibiting no interference, and providing remarkable off-axis response. By eliminating multiple sets of speakers that interfere with each other, the overall fidelity of the system is greatly improved, intelligibility is increased, and a more pleasant listening experience is provided for the audience.
Low TCR voice coil wire
Thermal Coefficient of Resistivity (TCR) Maintains constant impedance
Thermal Coefficient of Resistivity (TCR) Maintains constant impedance
For electric coil windings, particularly in moving coils such as the voice coil of a heavy duty bass loudspeaker or other electro-acoustic transducer, the present invention has found metallic materials, as alternatives to copper or aluminum in the voice coil wire, that can provide increased available maximum SPL (sound pressure level) exceeding an empirical limit, just under 120 dB/1 m, that has been found to apply to various loudspeakers of known art regardless of efficiency and structural differences. Through study of known art regarding this limitation and theoretical analysis of the factors in voice coil structure and design that limit the maximum attainable SPL, a novel basis for selecting voice coil wire material has been developed. By selecting wire material for low TCR (temperature coefficient of resistance) along with suitable resistivity and density, rather than for low resistivity alone which has conventionally dictated copper or aluminum, the present invention has led to the identification of new wire materials that can increase the available SPL. Such materials include alloys of aluminum containing between two and five component basic metals selected from the following group: magnesium, silicon, manganese, zinc and copper. The alloy Al Mg(3.5%) in extruded form yields maximum SPL 1.5 dB above that of pure aluminum and 3.32 dB above that of pure copper
Patented 1994 JBL Incorporated.
First use of Alnico magnets.
Composed of Aluminum, Nickel and Cobalt, JBL was the industry leader in introducing this strong permanent high power alloy in professional speaker systems.Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss (0.15 tesla), or about 3000 times the strength of Earth's magnetic field.
First introduced in the D130, 15-inch transducer.
First to introduce titanium in high-frequency diaphragms
JBL’s titanium diamond diaphragm structure combines the ruggedness of phenolic and composite-type diaphragms with the outstanding frequency response of fragile aluminum and exotic metal diaphragms.
First neodymium-magnet Pro Audio compression driver and woofer
Neodymium magnets and dual voice coils provide peak performance at a fraction of the weight of conventional drivers. JBL’s next generation neodymium compression drivers deliver stunningly accurate high frequencies through a new 1.5" annular polymer diaphragm design.Neodymium's magnetic properties allow a few ounces to replace pounds of conventional magnet material. While other speaker manufacturers may use neodymium, JBL engineers created a design that reduces the massive (and heavy) steel top plates,back plates, and pole pieces that complete the "magnetic circuit".