Astell & Kern A&ultima SP4000 Copper Limited Edition Portable High-Resolution Digital Audio Player podcast Being closed back

Being closed back

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What is the main upgrade in the CMA Eighteen Master compared to the CMA Fifteen

Never miss a beat with 10 hours of battery life from the earbuds and 20 hours from the case

and guarantee superior ventilation

Astell & Kern A&ultima SP4000 Copper Limited Edition Portable High-Resolution Digital Audio Player podcast Being closed backLimited 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