Horn No.1931 -- ES Front Horn for GRS PT6825 Planar Tweeter – Joseph Crowe
TWEETER PLANAR X PAPEL CELULOSE X PET MYLAR X SEDA SILK SOFT DOME RTA ALTA FIDELIDADE HI-FI HIFI - YouTube
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 (Gloss Black) : Electronics