Rockford Fosgate Car Audio 1.5 Inch 400 Watt 4 Ohm High SPL Punch Pro PP4-T Tweeters The PP4-T Punch Pro is a 1.5 inch tweeter with integral 6dB high-pass crossover designed for high SPL (sound pressure level) conditions. The oversized motor structure and high power diaphragm, combined with a billet machined aluminum phase plug create the foundation for a highly sensitive speaker that can handle plenty of power. You'll be proud, because these things are loud! Mounting hardware is included in the package. Highlights: - Aluminum diaphragm. - Metal input spring terminal connection. - High temperature Kapton front voice coil. - Die-cast aluminum housing. - Billet machined aluminum phase plug. - Mounting hardware included. - Sold as individual units (not pairs). - Built-in 6dB/Octave crossover. - 1 Year manufacturer warranty. This listing includes: (4) Rockford Fosgate 1.5 PP4-T Tweeters SPECIFICATIONS PER TWEETER: Nominal Diameter: 1.5 (1.500 in) Nominal Impedance: 4 Ohms MAX Power Handling: 100 Watts RMS Power Handling: 50 Watts Sensitivity (1w/3.3 ft): 105dB Sensitivity (2.83V/1M). ): 108dB Frequency Response: 4.5KHz~20KHz Crossover: 4.5KHz @ 6dB/Octave MOTOR: Voice Coil Diameter: 1.475 (1.476 in) Voice Coil Former Material: High Temperature Kapton Diaphragm Material: Aluminum Free Air Resonance: Fs - 3KHz DIMENSIONS PER TWEETER: Overall Diameter: 5.288 (134) mm) Tweeter Mounting Diameter: 4.33 (4.331 in) Mounting Depth: 2.59 (2.591 in) Overall Depth: 3.24 (3.239 in) Motor Diameter: 4.33 (4.331 in)