It's easy to build a tweeter with extended frequency response. It's hard to build one that achieves the response with minimal distortion. That's why Sony materials scientists developed Nano-Fine technology. One commonly found tweeter design binds polyamide strands with compound particles several micrometers in diameter. The difference is clearly audible.
Mechanical resistance is reduced, for extended high-frequency response.
Internal loss is doubled, for substantially reduced distortion. Sony Nano-Fine tweeters also feature the Balanced Dome design for wide dispersion and reduced distortion. In addition, ferro-fluid cooling improves power handling and resists tweeter burnout. The net result is superb performance for today's high-resolution audio discs. Sony's Advanced Super Active Woofer develops powerful bass from a cabinet that's compact.