ELAC Dual Reference Series Subwoofers: Total Performance Begins with DesignExperience the incredible sound of our iconic Dual Reference Series Subwoofer - this single subwoofer can power your sound system with even, precisely tuned, crystal-clear bass. Our state-of-the-art technology delivers a clean, balanced low-frequency experience, with two powerful bass drivers with excellent linearity, producing tight and accurate bass, with minimal distortion. Perfectly tuned for the most demanding movies or music.Advanced Woofer DesignTotal Performance Begins with Design.Our High Excursion (HEX) surround technology allows for greater extrusion and less distortion.However, to facilitate the extra movement, longer voice coils were required. Meaning our Aluminum Sandwich technology was too heavy.To improve efficiency, our drivers were designed with cutouts arranged in the paper cone prior to gluing to the aluminum cone.The Die Cast backrest ensures strength under load, and a large magnet completes the custom driver.Custom Designed BASH AmplifierAll seven models utilize BASH technology.The discrete implementation of these tracking amplifiers allows for maximum voltage swing, providing all the power that is needed and additional dynamic power throughout the entire operating range of the woofers.Auto EQ and Advanced App ControlPlacement of a subwoofer can be challenging. This is becau