The Pioneer S-55, released in 1990, is a speaker model designed for quality sound reproduction. It features a two-way design with a 12-inch woofer and a 4-inch cone mid-range driver, providing a wide frequency response suitable for various types of music. The speaker is built with a robust cabinet that supports enhanced bass performance and clarity. It supports both home and professional audio use, making it versatile for different settings. The S-55 is also compatible with a range of amplifier outputs, allowing it to be integrated into various audio systems.