Astell & Kern A&ultima SP4000 Copper Limited Edition Portable High-Resolution Digital Audio Player exclude from earzfit 5mm TRRS analog cable (1

5mm TRRS analog cable (1

And if the earbuds get dirty

OK0300PRO Optical cable

true to its name

MC (lo) 60 dB (+/- 1 dB)

Astell & Kern A&ultima SP4000 Copper Limited Edition Portable High-Resolution Digital Audio Player exclude from earzfit 5mm TRRS analog cable (1Limited Edition Copper The A&ultima SP4000 Copper Limited Edition goes beyond a high end portable audio player. It represents the culmination of Astell&Kerns expertise in material engineering, precision manufacturing, and refined analog sound design. SP4000 Copper is the brands most definitive answer to a single question: how far can we go in the pursuit of the ultimate sound? Copper is theoretically one of the most ideal materials for audio, yet