Power Acoustik XP-402K XP Series Speakers: * Black texture coat stamped steel frame * Chrome back plate * Polypropylene injection cone * Butyl rubber surround * 3-ohm impedance * 1" silk midrange (694K) * 0.75" silk tweeter * Configuration: 4", 2-way * Frequency Response: 100 - 20KHz * System Impedance: 3 ohm * Max Power Handling: 180W * RMS Power Handling: 180W * System Efficiency: 86 dB * Midbass Voice Coil: 1" aluminum * Midbass Magnet: 5.3 oz * Midbass Cone Material: Polypropylene * Top Mount Depth: 1.875" * Bottom Mount Depth: 2.125" * Cutout Dimension: 3.625"