NEO line bullet tweeters are a totally new project, lighter and more compact compared to the previous ST 25 and with superior performance thanks to the use of Neodymium N38 H for the motor units and a FEM (Finite Element Method) optimized driver/horn design. The “Active” version, ST 25A Neo provides tweeter only. Features - Powerful Neodymium magnet providing high performance with compact size. FEM (Finite Element Method) optimized phase-plug and loading horn. CCAR (Copper Clad Aluminium Ribbon) voice coil for unheard-of thermal and mechanical capability ready for an easy replacement with replacement body kit. Extra-light aluminium membrane to maximize SPL with high current, screw terminals. Body waterproofing and anti-UV treatment to allow safe outdoor use without discoloration over time. Specifications - Size mm (in.): 44 (1.8) Power Handling - Peak W: 100 Hi-pass filtered @ 5 kHz - 12 dB Oct. Impedance Ω: 4 Frequency response Hz: 3k ÷ 20k Sensitivity dB SPL: 107 Voice coil Ø mm (in.): 25 (1)