Product: iBasso Audio D55 USB-DAC Built-in Portable Headphone Amplifier I was occasionally listening to it connected to the final e5000, but I am selling it because I am switching to a different DAC. All functions are working properly. Also, this D55 is in very good condition, with no noticeable scratches. This is a rare DAC that uses the "Asahi Kasei Electronics high-performance 32-bit DAC 'AK4480'," which is also attracting attention from audio enthusiasts. I connected the final e5000 and listened to 24bit/96kHz and 192kHz high-resolution sound sources with Mid gain, and I recommend it for its beautiful sound with warmth despite its high resolution. Features: - Uses Asahi Kasei Electronics high-performance 32-bit DAC "AK4480". It can input high-resolution sound sources up to 24bit/192kHz via USB and output them with high quality. - Equipped with XMOS Semiconductor developed PLD "XMOS". It operates in asynchronous mode and independently generates a clock on the main unit, realizing high-quality sound with reduced jitter. - Inputs and outputs are USB digital input, analog line input/output, and headphone output, and it operates on bus power, so it can be connected without a power supply. - It also features LR independent op-amps and a 3-stage gain switching function (High/Mid/Low). Specifications: - Frequency/bit: 44.1kHz～192kHz/16bit, 24bit - DAC: Asahi Kasei Electronics AK4480 - Frequency Response: 10Hz～100kHz - S/N: 115dB - Headphone Impedance: 8～300Ω - Input Terminals: USB x 1 (Mini B), Stereo Mini x 1 - Output Terminals: Stereo Mini x 1 - Dimensions: 51W x 21H x 92Dmm - Weight: 120g *This is a sale of the main unit only. It will be carefully packaged and shipped in a separate box. *I am also selling it elsewhere, so please understand if it sells out.