Sony Yeds-18 [top] Page

The driver features a reinforced pulp cone, a material choice favored by audio purists for its natural, organic sound profile. Unlike metal or woven glass cones, which can sometimes sound "metallic" or "hard," pulp cones offer a smooth, natural rolloff. The surround (the flexible ring connecting the cone to the basket) is usually treated cloth or butyl rubber, allowing for long-throw movement—essential for pushing large volumes of air required for bass frequencies.

Here’s a balanced, user-style review for the (often remembered as a vintage portable CD player from the early 1990s, part of Sony’s Discman series).