[Pre-Sale]Douk Audio ST-02 HIFI Integrated Bluetooth Tube Amplifier

· A More Complete HiFi Amp: Evolved from the proven ST-01 PRO and refined around real HiFi needs, ST-02 combines a DAC, stereo amplifier, and headphone amplifier in a single unit. Bluetooth 5.4, PC-USB, optical, coaxial, and RCA cover both digital and analog sources, with direct lossless playback from USB drives. · Power Meets Precise 2.1 Control: TPA3255 delivers up to 300W×2 for strong drive with 4–8Ω passive speakers. Post-Filter Feedback (PFFB) keeps frequency response more consistent across speaker loads. Adjustable 20–230Hz HPF reduces deep-bass load on the mains, while a 150Hz LPF SUB OUT feeds a powered subwoofer for cleaner, better-integrated 2.1 sound. · Tube Warmth Meets Dynamic VU: A custom ECC83 tube stage adds classic warmth and texture, while 180V high-voltage operation keeps musical dynamics more composed. Large VU meters make every swing visible, with AGC adapting meter sensitivity across signal levels, while 34 backlight colors and 10 brightness levels let the display fit your setup.