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FOSI : https://fosiaudio.com/products/fosi-audio-sk02-desktop-dac-headphone-amp
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 a wide range of headphones and IEMs with an impedance range of 16-300 ohms.
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.
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.
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.
The Fosi Audio SK02 is a versatile DAC and headphone amplifier designed for high-resolution audio performance. It supports both USB and optical inputs, and offers multiple outputs including 3.5mm and 4.4mm headphone jacks, as well as a 3.5mm line out. The amplifier's output power varies by connection, with the 3.5mm jack delivering up to 280mW at 32Ω in high gain mode, and the 4.4mm jack providing up to 1100mW at 32Ω. It features a frequency range of 20Hz-20kHz (±0.02dB), with a total harmonic distortion (THD) of ≤0.001% at 1kHz and a signal-to-noise ratio (SNR) of up to 120dB for the 3.5mm jack and 115dB for the 4.4mm jack in high gain mode. The SK02 can handle headphone impedances from 16-300Ω, supports PC-USB sampling rates up to 32Bit/384KHz DSD256, and optical sampling rates up to 24Bit/192KHz. Powered by an ESS Sabre ES9038Q2M DAC chip, the SK02 is compact, measuring 4.76 x 2 x 1.69 inches and weighing 0.84 lbs (380g), with power supplied via a 5V USB Type-C connection.
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