When nothing but the loudest and clearest high frequencies matter but space is limited, then the PBX-PRO4H Horn Tweeter is what you need. This super efficient Tweeter is loud and clear and will not only make your highs stand out, but it will be ear catching and give your system the attention it deserves. We use a combination of different combined technologies to deliver nothing but piercing and accurate highs. When combined with the XPRO-8/8CX or XPRO-65/65CX Mid-Range drivers, you will have the brightest and loudest mids and highs in your ride that can be heard for over a mile away. Now all you need is to add some PowerBass Subwoofers and you will be the Audio King of your city! Features: 4" Pro Audio Ring Radiator Horn Tweeter Black Powder Coated Cast Aluminum Horn Housing Titanium Diaphragm Billet Aluminum CNC Cut Phase Plug Chrome Push Input Terminals 1.75" KSV Voice Coil Double Stack 25 oz. Y-35 Grade Motor Structure 4-ohm Impedance Sold Individually Specifications Nominal Impedance: 4-ohm Material: Cast Aluminum Magnet Size: 25 oz Ferrite Magnet Sensitivity (1W / 1M): 106 dB Mounting Depth: 3.11 in Size: 4" Sensitivity: 106 dB Frequency Response: 3 kHz - 20 kHz Power Handling (RMS/Peak): 150 watts / 300 watts