Astell & Kern A&ultima SP4000 Portable High-Resolution Digital Audio Player headphone 2.5mm This design enhances both stability

This design enhances both stability and comfort for hours on end

2dB Peak output voltage 23Vp-p

Frequency response: 20Hz - 20kHz Maximum volts out: 1

and there is nothing on Earth that will look like it

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

Astell & Kern A&ultima SP4000 Portable High-Resolution Digital Audio Player headphone 2.5mm This design enhances both stabilitySP4000 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