Astell & Kern A&ultima SP4000 Portable High-Resolution Digital Audio Player headphone 2.5mm the Xelelento wireless (2nd generation)

the Xelelento wireless (2nd generation) can also be expanded

While transducer quality obviously directly impacts high-level response and speed

The WH-CH520 headphones with up to 50 hours of battery life

DAC: 32bit

2dB Peak output voltage 23Vp-p

Astell & Kern A&ultima SP4000 Portable High-Resolution Digital Audio Player headphone 2.5mm the Xelelento wireless (2nd generation)SP4000 Built on Legacy, Evolving Perfection The A&ultima SP4000 is Astell&Kern's newest flagship digital audio player, the result of three years of relentless research and innovation following the development of the SP3000. As part of the A&ultima series Astell&Kern's flagship lineup combining cutting edge technology and top tier specifications the SP4000 surpasses the boundaries set by the SP3000, once regarded as the ultimate reference. Built upon