The technology of transducers is truly the starting place for the entire JBL engineering legacy. Building on James B. Lansing's historic foundation, JBL engineers continue to break ground on new and better ways to design transducers, reaching beyond what is commonly understood as possible and consistently setting new performance benchmarks for the audio industry. Starting from scratch and often developing patents in the process, JBL engineers always develop from the ground up, resulting in technologies, such as Differential Drive woofers, CMCD Cone Midrange drivers, and the D2 Dual Voice Coil Compression Driver, that cover the entire practical bandwidth of professional audio devices. Simultaneously addressing performance-robbing challenges such as power compression, heat dissipation, distortion, component weight, and physical footprint, JBL has created a range of transducers that are unparalleled in their ability to deliver extraordinary performance throughout a wide range of applications.

Differential Drive®

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 Transition™ 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