Planar (Ribbon) Magnetic Speaker. Detail of DIY construction of a large planar (ribbon) speaker. - YouTube
6moons audio reviews: Analysis Audio Epsilon
Magnepan LRS Magnetic Planar Speakers with Stands, Complete Set
Amazon.com: Aperion Audio MKII Planar-Ribbon Super Tweeter Pair for Home Theater Stereo Speaker HiFi Audiophile Ultra High-End Frequency Response up to 40kHz (Stealth Black) : Electronics
Open-source planar magnetic headphone driver project. Work in progress. : r/headphones