JBL LSR 28P

The LSR28P is a bi-amplified system that builds on the foundations of JBL's proprietary Linear Spatial Reference (LSR) technology, which has created a new standard in studio reference monitoring. The JBL LSR28P utilizes two new JBL LSR transducers. This system also incorporates other recent JBL transducer technology innovations, including Differential Drive technology and the carbon fiber composite materials. The advent of new self-powered configurations for these technologies redefines what an accurate near-field monitoring system can be. All of the new self-powered JBL LSR speaker systems are based upon Linear Spatial Reference (LSR) technology - which has redefined what a sound reproduction system can and should be. Linear Spatial Reference is a collection of carefully calculated techniques that go far beyond simple on-axis frequency response measurements. Instead, LSR technology measures the performance of a speaker over a sphere that encompasses all energy radiated into the listening environment in every direction and analyzed algorithmically via known psycho-acoustic principles to calculate complete and accurate optimization of the sound field, including the direct sound field, the reflected sound field and the reverberant sound field. The LSR28P combines two high-power amplifiers with an active crossover system. Active crossover circuitry results in a high Linkwitz-Riley electroacoustic response between low and high frequency devices for smooth transition in both the frequency and time domains. This results in exception imaging and a lack of time smear. All of the new LSR speaker systems incorporate other JBL innovations, including JBL's Differential Drive (DD) technology. DD utilizes two voice coils in each driver, with their magnetic gaps set 180 degrees out of phase with each other. A third coil acts as dynamic brake at maximum excursion to reduce audible distortion. The net effect is to double the power handling capability of each driver, allowing the Differential Drive drivers to deliver virtually distortion-free audio at higher power levels than ever before. In combination with other new design elements, such as the nested magnetic structure and preferential airflow design which further increase efficiency by more rapidly dissipating heat, the JBL Differential Drive driver is the most effective on the market. Other JBL-designed or developed components and technologies include the latest in composite materials, such as a carbon-fiber composite baffle to reduce resonances and a rigid inertial ground for the transducers to reduce box loses. A Linear Dynamic Aperture (LDA) reinforces the low frequency response for an exceptionally well-defined bass. Flared inner and outer sections reduce port compression and air noise, fully optimizing the low power compression designs of the Differential Drive woofers.