Description: The Hifonics Colossus Classic 4-inch 2-way coaxial car speakers deliver clear, dynamic sound with aluminum dome tweeters for crisp highs and butyl rubber surrounds for deep bass. Built for durability and performance, these speakers are a perfect upgrade to any car audio system. Features: Tweeters: 1-inch aluminum dome tweeters deliver high output, extend frequency response, and keep music reproduction feeling natural. Cone Material: Lightweight blue woven fiber cones enables faster midrange response. Surround / Cone Coupling: Butyl rubber surrounds provide durability and deeper mid-bass impact. Voice Coil / Former Assembly: Pure copper voice coil creates strong magnetic field with a very thin extrusion. The Kapton former assembly is lightweight and efficiently dissipates heat. Spider: Epoxy infused natural fiber allows flexibility while the epoxy which gives strength during the manufacturing process. Cooling System: Over coil cooling system allows air to be exchanged over the voice coil through the spider. Crossover: Passive Butterworth crossover gives smooth transition of frequencies from midrange/midbass to the tweeter element. Frame: Anti-resonant stamped steel basket strengthens the whole speaker assembly with minimal harmonics or distortion from flex and ringing. Motor: Ferrite magnet creates a strong magnetic field while remaining small enough to fit nearly every application. Connectors: Spade connectors or solder direct for the best connection. Grills: No: Typical installation mounts speakers behind a panel or dash. Specifications: Type: Speaker Series: COLOSSUS Classic Color: Black/Blue Compatible Vehicles: Universal RMS Power Handling: 40 watts Peak Power Handling: 75 watts Frequency Response: 80Hz - 20kHz Sensitivity: 88 dB Crossover Slope: 6 kHz, 12 dB Mounting Diameter / Cut Out: 3.69 in Outside Diameter: 5.39 in Mounting Depth / Chassis Depth: 3.0 in Speaker Size: 4 in Weight: 2.7 lbs Dimensions: 12 × 6 × 3 in