Hi-Vi B4N 4" Aluminum Cone Wide Band

Hi-Vi Research B4N 4" Aluminum Cone with Copper Anodizing

• Anodized advanced alloy cone (magnesium/aluminum), coated with special damping material
• High power handling, heat-resistant Kapton voice coil former and heat-resistant SV voice coil wire
• Shielded magnetic system with long-throw linear excursion
• Rubber surround

Good choice for small bookshelf speakers.  Often used for multimedia or computer speakers.  

In 0.1 to 0.15 cubic foot sealed box you get down to about 85Hz.  A sealed box also has a nice gradual roll off on the low end.