4200 Series
4400 Series

LSR12P Linear Spatial
Reference Subwoofer
LSR12P Specification Sheet 

The LSR12P is a powered subwoofer 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 LSR12P Powered Subwoofer is made up of the 252F low-frequency transducer and the LSR12P Amplifier with 250-watts continuous power providing the proper drive levels for optimized frequency response. This highly accurate subwoofer is designed to be compatible for both the LSR28P self-powered speaker system and the LSR 32, as well as offering multiformat compatibility with Dolby® AC-3, DTS® and other surround audio systems. 

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.

All of the new powered LSR speaker systems also incorporate other JBL innovations, including JBL's Differential Drive® technology. This 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 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 increases 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 ridged 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.

"The new JBL powered LSR products are designed to take the LSR series further into the new generation of recording, mixing and mastering suites, offering them both the new benchmark of excellence that the LSR technology represents and the choice of both passive and active reference monitoring systems," said David Kimm, Director, Recording & Broadcast, JBL Professional. "The LSR28P and LSR12P systems are solutions designed to create a mid-field and near-field monitoring environment second to none, and that is exactly what they accomplish."

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