Start with what SD63 and f38 have in common: despite a plasticy feel that runs almost from top to bottom of each headphone, each one has a perforated, foam-filled headband with color-matched padded earcups, a long headphone cable, and chrome metal extension arms—standouts because they’re the primary metal pieces on the otherwise synthetic designs. The more compact SD63 has one 40mm speaker inside each of its earcups, while the larger f38…
