Alpha 403F

The Infinity Alpha 403F is the ideal car speaker and coaxial speaker for anyone looking to take their in-car sound to the next level without breaking the bank. With a smart design, reliable performance, and signature Infinity sound quality, this 4-inch car speaker brings crystal-clear sound to any vehicle—whether you drive a compact car, sedan, or van. Thanks to the powerful Plus One™ woofer, balanced PEI dome tweeter, and wide frequency response, you'll experience music exactly as it was meant to be heard: powerful, clear, and consistently balanced.

Deep bass and clear midrange

The Infinity Alpha 403F features the proven Plus One™ woofer cone , which is larger than standard woofer surfaces in the same size class. This allows it to move more air and produce deeper bass and warmer midrange. So your favorite music sounds fuller, even at lower volumes.

Clear highs, anytime, anywhere

The built-in PEI balanced dome tweeter delivers a sparkling high range. From subtle details in acoustic tracks to sparkling hi-hats in electronic music, everything comes through crystal clear, without distortion.

Designed for any car and easy to install

Thanks to their universal design and the new Infinity ID design, these car speakers will fit in virtually any car. Whether you're a beginner or an experienced mechanic, the included mounting kit makes installing the speakers quick and hassle-free.

Built for years of listening pleasure.

Every Infinity Alpha 403F endures rigorous reliability testing and is meticulously tuned by top audio engineers. This ensures stable performance and durable use – ride after ride.

Technical specifications

• Size: 4 inches (100 mm)
• Power: 40W RMS / 320W peak
• Sensitivity (@ 2.83 V): 88 dB
• Frequency response: 80 Hz – 20 kHz
• Impedance: 4 Ohms

Package contents

• 2x Infinity Alpha 403F coaxial car speakers (4 inches)
• 8x Screws
• 8x Cable lugs
• 2x Foam rubber seals
• 1x Mini User Manual

Note: This item/pack is sold as a pair and contains 2 speakers.