Find Your Optimal Sound Staying true to our philosophy of delivering original audio experiences without compromise Astell&Kern strives to design portable music players that reach beyond the capabilities of a standard playback device to enhance the listeners music enjoyment. The SP2000T combines the OP AMP configuration of our SP2000—the culmination of Astell&Kerns finest audio technology—with a nostalgic vacuum TUBE AMP adding a vintage feel to the portable player. The Triple Amp System Takes Acoustics to a New Level.Vacuum Tube Amplifier Compatible with 2.5 mm 3.5 mm and 4.4 mm Output Jacks.Equipped with ESS ES9068AS QUAD-DAC for Balanced Ultra Detailed Sound.TERATON ALPHA Astell&Kerns Ultimate Sound Solution.ReplayGain Function to Maintain Consistent Playback Levels between Tracks.Dual-Band Wi-fi Support for Uninterrupted Wireless Connection and Improved Compatibility.Internal Mechanical Design to Minimize Noise Introducing the A&ultima SP2000T. The Ingenious New Solution. SP2000T The \"T\" in SP2000T does not stand for a specific word but rather encompasses design approaches and directions made during the product development process. True - The SP2000T inherits the SP2000s true-sound philosophy Triple - Triple AMP System Timeless - Timeless Value Tube - Vintage Vacuum Tube Amplifier