ST400TRIO JBL Selenium 8 Ohm Super Tweeter Barium Ferrite Magnet BRAND NEWBRAND NEW' ST400TRIO JBL Selenium 8 Ohm Super Tweeter w Barium Ferrite Magnet Super tweeter for amazing detail and clarity in high frequencies without the rigidness. The ST400TRIO may be used individually in lower power systems or arrayed for increased coverage and spl in stronger power systems. the base and diffuser are constructed of aluminum housing contributes to better heat dissipation of the coil moves, with finish machining of (diamond tool)