The JBL / Selenium ST400 is a Super Tweeter for outstanding detail and clarity in high frequencies without harshness. The ST400 may be used individually in lower power systems or arrayed for increased coverage and SPL in higher power systems and is equipped through quick coupling connectors. The base and diffuser are constructed of aluminum which contributes to better heat dissipation. The bullet shape horn design offers a longer throw 40 x 40 ° dispersion. The phenolic annular diaphragm is long lasting, cost effective and more natural sounding than metallic diaphragms. The use of high temperature materials and adhesives improves power handling and produces exceptionally high acoustic output. A precisely engineered diaphragm structure and alignment mechanism for easy, reliable, cost effective repair in case of diaphragm failure. Specifications: Power handling: 150 W RMS / 300 W maximum RMS power using crossover (active / passive): NBR 10.3 (HPF 5 hz 12 dB / OIT): 100 W / (HPF 8 hz 12 dB / OIT): 150 W Music program power using crossover (active / passive): (HPF 5 hz 12 dB / OIT): 200 W / (HPF 8 hz 12 dB / OIT): 300 W Nominal impedance: 8 ohms Voice coil diameter: 42 mm Frequency response: 4000 - 20,000 hz SPL: 111 dB 2.8 V / 1 m DC resistance: 6.2 ohms Voice coil winding length: 2.2 m Voice coil winding depth: 2 mm Sound dispersion (H x V): 40 x 40 ° Diaphragm material: phenolic Flux density: 1.7 T Volume displaced by Tweeter: 0.6 L Magnet weight: 470 g Net weight: 1690 g Connectors: quick coupling Front baffle cutout diameter: 106 mm Depth: 87 mm Magnet diameter: 102 mm Magnet height: 14 mm Package contents: ST400 Selenium speaker Owner's manual
