Astell&Kern A&ultima SP2000T Audio Player
Vacuum tubes are known for their warmer, vintage tone. Astell&Kern is now using one to boost the capabilities of its A&ultima SP2000T audio player. In addition to the OP AMP configuration, it has a vacuum tube amp compatible with 2.5mm, 3.5mm, and 4.4mm output jacks. It also has a quad-DAC system for superior audio quality, dual-Band Wifi, a Full HD touchscreen, and support for LDAC aptX-HD.