Exclusive Rotating Elliptical Lens focuses the tweeter"s high frequency response directly to your listening position for pinpoint imaging and clear detail, even from off-axis factory speaker locations: • Under the REL is a 3/4" Soft Dome Tweeter for high power handling and smooth response.• Anti-Diffraction Tweeter Post, shaped like a funnel to minimize distorting driver "bounce back."• Durable Poly/Mica cone.• Butyl Rubber Surround beats the most extreme conditions.• Multi-hole mounting pattern and low profile for easy installation in virtually any location.• Powder-coated, anti-corrosion, reinforced steel basket and grille. EX3 Series Full Range Coaxial Car Speakers are the ideal combination of high technology, high performance, drop-in flexibility and price. Replace your factory speakers with EX3 speakers with a minimum of cutting, knuckle-banging and dash-destruction. Designed to boost the performance of your stock head unit (so you don"t have to blow extra money on electronics) with more efficient power handling and the unique REL sound-tailoring technology. That"s why EX3 Series Coaxials deliver better imaging, more balance and greater clarity.Polk"s EX3 speakers combine high efficiency with good power handling - they"ll deliver great sound whether they"re powered by a factory receiver or an external amp. The EX346 4"x6" speakers employ a soft dome tweeter with a rotating lens, so you can "dial in" the imaging just the way you like it, compensating for poor factory speaker placement in the process. The moisture-resistant mica-filled polymer composite woofer cones produce full, accurate midbass, while the durable rubber surrounds increase speaker life and improve bass response. Grilles are not included. (Factory grilles are appropriate for most installations.)