Ribbon tweeters fall into 3 main categories:
- 'True' Ribbon,
- Air Motion Transformer (AMT).
Magnetostatic ribbon tweeters feature a thin film diaphragm / circuit board mounted directly above the magnets. These tweeters are relatively inexpensive and offer good results with high sensitivity.
True ribbon tweeters feature a flat (or sometimes pleated) ribbon suspended under tension within the magnetic gap. Due to the very low impedance of the ribbon, this type of tweeter has an inbuilt impedance matching transformer.
Air Motion Transformer tweeters are similar in build to the 'true' ribbon tweeter but the mode of operation is entirely different: the pleated diaphragm has no forward / aft movement, instead it expands and contracts along its length like a bellows. AMT tweeters do not require an impedance matching transformer.
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