Fosi SK02 USB DAC Amplifier Amp Audio Decoder Support DSD 256 PCM For 3.5MM & 4.4MM Balanced Headphone

Fosi Audio SK02 DAC Headphone Amplifier Preamp Support DSD 256 PCM For 3.5MM & 4.4MM Balanced Headphone Notice: If you choose to ship from the Brazil warehouse, Aliexpress currently does not offer the option of collecting and paying ICMS fees on behalf of the buyer. If it is found later by the tax authorities that ICMS fees need to be paid, the buyer is responsible for paying them, and the seller will not bear the responsibility. if you mind to pay 18% of the ICMS fee, please choose to ship from China, thank you for your understanding! Features *1.Compact Yet Powerful: The SK02 employs a minimalist and stylish design language. Despite its small size, it boasts mighty features. It supports DSD256 and PCM 32bit/384kHz high-resolution decoding, along with 3.5mm single-ended and 4.4mm balanced headphone outputs. Its robust power can easily drive wide range of headphones and IEMs with an impedance range of 16-300 ohms. *2.Stunning Performance: It features a high-end ESS SABRE ES9038Q2M DAC and SGM8262 op-amps. Its excellent circuit design ensures superior parameters with a SNR as high as 120dB, a low noise floor of only 3.7μV, and an incredibly low THD of 0.001%. The 4.4mm balanced output power reaches an impressive 1100mW at 32 ohms. The exceptional high-resolution capability and pure sound quality make every listening experience an extraordinary sensory journey. *3.User-Friendly Design: The SK02 requires no drivers and offers plug-and-play convenience. It integrates a big multi-functional control knob, allowing easy access to power on/off, play/pause, and volume adjustments. The unit features quick-switch buttons for high/low gain and input modes. Additionally, its colorful indicator lights enable effortless identification of the current working mode and the song's sampling rate. *4.Remarkable Versatility: Supports USB and optical input, widely applicable for decoding with computers, laptops, CD players, TVs, and projectors. Not only can it function as a headphone amplifier, but it can also serve as a preamp, pairing with active speakers or an amplifier like Fosi Audio V3, ZA3, TB10D amp and passive speakers to form a desktop listening or home audio system. *5.Exquisite and Durable: The SK02 is crafted from a single piece of aluminum alloy using CNC machining and a delicate sandblasting process. This not only gives it an exquisite appearance but also ensures lasting durability. In addition, Fosi Audio pledges to provide a 24-month worry-free warranty and responsive customer service to all users. Highlight Model: SK02 Input : USB/OPT Output : 3.5mm Headphone, 4.4mm Headphone, 3.5MM line out/OPT Powe Supply:5V Power Input Interface: USB Type-C THD≤0.001% @ 1kHz SNR: 3.5mm Headphone: Low Gain:116dB  High Gain:120dB 4.4mm Headphone: Low Gain:110dB  High Gain:115dB Frequency response: 20Hz-20kHz (±0.02dB) Amp output maximum power: 3.5MM： High Gain: 280mW@32Ω, 130mW@64Ω, 40mW@250Ω, 30mW@300Ω Low Gain: 90mW@32Ω, 50mW@64Ω, 1 15mW@250Ω, 10mW@300Ω 4.4MM： High Gain: 1100mW@32Ω, 550mW@64Ω, 150mW@250Ω, 120mW@300Ω Low Gain: 350mW@32Ω, 180mW@64Ω, 50mW@250Ω, 40mW@300Ω Headphone matching impedance: 16-300Ω PC-USB Sampling Rate: 32Bit/384KHz DSD256 OPT Sampling Rate: 24Bit/192KHz DAC Chip: ES9038Q2M Size (L*W*H): 4.76*2*1.69inch (121*51*43mm) Net Weight: 0.84lb/380g Package Include *1x Fosi Audio Sk02 Headphone Amp *1x 2-in-1 USB Type-A/C to Type-C Cable *1x User’s Manual QA Q1:Why isn't my SK02 working? Press and hold the volume button for 3 seconds to power on. Please make sure the 2-in-1 USB Type-C plug is fully inserted into the source device. Restart your computer and reconnect the SK02, then select SK02 as the sound output device. If you're using an Android phone, check that both USB debugging and OTG functions are enabled in your phone settings. Also, try using a different USB OTG cable to rule out any cable-related issues. Try to connect it to different sources. Q2：Is it normal for the knob to make noise when turning? It is normal for the knob to make noise when turned, as this knob is designed to be omnidirectional.