1. Very shallow mounting depth (3.25 / 3.50 Inches)2. Very long linear excursion capability (0.60 In / 15.2 mm, one-way)3. Patented "concentric tube" architecture4. Cast alloy frame5. Rubber surround6. No pole vent: permits mounting close to rear wall of enclosure.7. Very small sealed enclosure volume requirements8. DMA-optimized motor designs9. Patented "floating cone attach method" technology10. Injection molded, mica-filled polypropylene cone11. Aluminum-alloy dust cap and rear cap with JL Audio logo