JL Audio C1-650 Silk component speakers (165 mm).

JL Audio C1-650se component speakers (165 mm).

2-Way Component System: 6.5-inch (165 mm) Woofer, 1-inch (25 mm) Silk Dome Tweeter
The C1-650se component system is engineered to deliver remarkable fidelity and outstanding value in a format that easily fits in factory locations.
Outfitted with pure, silk dome tweeters, the C1-650se component system stands above others in its category with silky smooth, high-frequency clarity and definition. 
The 1-inch tweeter’s edge-driven design delivers excellent off-axis response and treble extension. 
It also benefits from the damping of a silk surround suspension and Ferrofluid in the voice coil gap, along with the superior strength of a neodymium magnet circuit. Outboard, 3rd order, high-pass in-line filters, with 
Advanced Tweeter Protection Circuitry, are also included to guard against high-distortion damage and improve power handling. For maximum installation versatility, surface and flush tweeter mounts are also included. 
C1 woofer drivers benefit from proprietary FEA modeling and JL Audio's expertise in low-frequency driver design. This knowledge is used to create speakers that can play loudly while maintaining a smooth, dynamic, low-distortion sound. 
At the core of the C1-650 woofer is a proprietary, stamped, steel 6.5-inch (165 mm) frame and DMA-optimized motor system. 
A mineral-filled, injection-molded, polypropylene cone is suspended with a rubber surround on the front, and a carefully engineered flat Conex® spider at the top of the voice coil, to precisely control the voice coil's motion. 
Tinsel leads are carefully routed and attached to each spider to prevent fatigue and buzzing. These are the same kinds of features and materials normally found on much more expensive loudspeakers.
To maximize fit, multi-application adaptor rings are included for the woofers, allowing easy, drop-in installation in vehicles equipped with oversized 6.5-inch and 6.75-inch speaker openings. 
Without the ring, the woofers will also fit into many "6-inch" speaker locations as well.