Sony CDX-C90 & XDP-4000X
From XES-P1 to XES-Z50, and Finally to a More Flexible High-End System When talking about Sony’s high-end car audio history in the 1990s, one name inevitably comes up: Mobile ES. Within that legendary lineup, several products stand out — the early XES-P1, the 1996 XES-Z50, and later, the CDX-C90 and XDP-4000X. At first glance, they…