Infinity Alpha 403F

The Infinity Alpha 403F coaxial car speakers, with a diameter of 100mm, are the ideal solution for upgrading your vehicle's sound system. They use a patented Plus One polypropylene woofer cone, which, combined with a PEI dome tweeter, creates a balanced soundscape. The speakers offer a continuous power output of 40W RMS and are designed for easy installation in a wide range of cars and lorries. Thanks to their nominal 4-ohm impedance, you can connect them to both standard car stereos and external amplifiers.

Patented Plus One cone

The woofer uses the patented Plus One cone architecture. This technology provides a larger active cone area compared to standard speakers of the same size. The result is higher sensitivity and a noticeably better low-frequency response. This makes the bass sound tighter and fuller, which you'll appreciate when listening to any music genre.

Balanced sound performance

The overall sound is delivered by a combination of two drivers. While the polypropylene woofer forms a solid foundation in the bass and mid-range frequencies, it is complemented by a PEI dome tweeter. This adds clear, distortion-free high frequencies up to 20kHz, even at higher volume levels. The soundscape is therefore detailed and easy to understand.

Compatibility and reliability

Thanks to their nominal 4-ohm impedance, the speakers are compatible with most standard car stereos as well as more powerful external amplifiers. You can therefore use them for a basic audio system upgrade or as part of a more advanced setup. In addition, the speakers have passed demanding reliability and durability tests to handle the specific operating conditions in a car environment, including temperature changes and vibrations.