Extremely compact size for explosive performance; ST 25 is the first Hertz car audio compression driver designed for SPL competitions. The 25 mm ST 25 with CCAR (Copper Clad Aluminum Ribbon) voice coil features an extra-light aluminum membrane with high thermal dissipation. An extremely powerful neodymium magnet is employed along with high efficient compression loading horn, designed for maximum high frequency acoustic pressure.
Size mm 1 inch, 25 mm Power Handling - Peak W 100 Impedance Ω 4 Frequency response Hz 3k ÷ 20k Sensitivity dB SPL 107 Voice coil Ø mm (in.) 25 (1) Magnet Neodymium Cone/Dome Aluminium - See more at: http://www.hertzaudiovideo.com/car-audio-compression_driver-spl_show-st25/#sthash.H0dTfiwE.dpuf