Alpine SPS-400

The Alpine SPS-400 is a set of 4”, 2-way coaxial speakers designed as a solution for customers seeking an upgrade from 4” OEM speakers. Each speaker utilizes a high-powered Poly-Mica cone woofer with a ¾” wide-range silk dome.

Together, they can output 140W over an 80Hz-22kHz frequency, which (sadly to say) is fairly poor per the price. However, keep in mind that the tweeters can swivel up to 10 degrees—users can therefore adjust them for optimal audio reception. Additionally, the Alpine SPS-400 is designed to work with both a built-in amplifier and an Alpine head-unit.