Designed and engineered in JBLs world-famous acoustic engineering facility in Northridge, California, and using the most advanced technologies and best components available, Project Everest DD67000 is one of the most sophisticated and sought-after speaker system available at any price. This three-way speaker features dual 15-inch (380mm) three-layer sandwich cone woofers, a 4-inch (100mm) pure beryllium compression driver and a 1-inch (25mm) pure-beryllium ultra high-frequency driver for a superlative listening experience.