Editing Tweeter (section)

===Ribbon tweeter===<!-- This section is linked from [[Decca Records]] -->
[[File:TweeterSpeakerCone.jpg|upright|thumb|A [[Philips]] ribbon tweeter]]

A ribbon tweeter uses a very thin diaphragm (often of aluminum, or perhaps metalized plastic film) that supports a planar coil frequently made by deposition of aluminium vapor, suspended in a powerful magnetic field (typically provided by [[neodymium]] magnets) to reproduce high frequencies. The development of ribbon tweeters has more or less followed the development of [[ribbon microphone]]s. The ribbon is of very lightweight material and so capable of very high acceleration and extended high frequency response. Ribbons have traditionally been incapable of high output (large magnet gaps leading to poor magnetic coupling is the main reason). But higher power versions of ribbon tweeters are becoming common in large-scale sound reinforcement line array systems, which can serve audiences of thousands. They are attractive in these applications since nearly all ribbon tweeters inherently exhibit useful directional properties, with very wide horizontal dispersion (coverage) and very tight vertical dispersion. These drivers can easily be stacked vertically, building a high frequency line array that produces high sound pressure levels much farther away from the speaker locations than do conventional tweeters.