Fosi Audio / MD3 Black

＜＜September 2026 New Product！＞＞The "MD3" is a portable DAC/amp that combines sound quality, design, and ease of use.

■ Carefully Selected Audio Chipset
・ In pursuit of the ultimate resolution and listening experience, our development team rigorously compared and tested mainstream chips—such as the RT6863 and SGM8262. Rather than simply chasing high output power, we prioritized sound quality above all else and opted for high-performance ESS chips. The flagship "ES9039Q2M" DAC chip delivers exceptional resolution while maintaining low power consumption, making the MD3 an ideal audio companion for mobile use. The MD3 is equipped with four ESS "ES9603Q" operational amplifiers. It supports native playback of up to 32-bit/384kHz PCM and DSD256 audio. Furthermore, with a signal-to-noise ratio of 116dB, it ensures stable, high-quality audio performance despite its portable form factor.

■ A Balance of Resolution and Musicality
・ High-Resolution Sound: Supports PCM 32-bit/384kHz and native DSD256, with THD+N reduced to 0.00075%, delivering clear, lossless playback that captures every detail.
・ Pure Sound from Silence: An aluminum alloy body and precision circuit design thoroughly suppress unwanted noise. The noise floor is reduced to 1.7μV, achieving an S/N ratio of up to 116dB.
・ Musicality-Focused Tuning: Achieves a balance between accurate reproduction and natural resonance. The warm sound profile prevents listener fatigue, allowing for comfortable, all-day enjoyment of music.

■ Display Support for GIF Animations and Photos
・ Comes with a variety of preset animations and emojis. Customize the external display by creating your own wallpaper using your favorite photos.

■ Mobile-Optimized Design for Smartphone Integration
・ Attaches smartly via powerful magnets; 16 N52 magnets ensure a secure hold. An aluminum alloy plate minimizes magnetic interference, ensuring clear audio quality. ■ Meticulous Attention to Detail
・ Magnetic Backplate: Crafted from premium leather; protects your smartphone from scratches while offering a pleasant, tactile feel.
・ LCD Display: Features a 1.28-inch fully laminated circular display equipped with screen rotation, brightness adjustment, and auto-off functions.
・ 5-Axis CNC Fine Machining: Boasts a retro-modern aesthetic inspired by vinyl records; CNC-engraved dot-matrix patterns on the sides allow the logo to stand out naturally.
・ Refined Aluminum Unibody: Sandblasted finish resists fingerprints and provides a premium feel; seamless, curved corners create a beautiful, natural look.

■ User-Centric Design
・ Ultra-lightweight & Compact: Weighs only about 50g, making it easy to carry anywhere.
・ Slim, Optimized Design (approx. 12mm): Balances a thin profile with ease of use; prevents interference with plugs and ensures a stable fit.
・ 100-Level Volume Adjustment: Allows for precise volume control for a comfortable listening experience.
・ Volume Memory Function: Automatically remembers your preferred volume setting.

■ Usable While Charging
・ Equipped with USB Type-C ports on both the top and bottom, allowing for playback while charging.
■ Chipset:
DAC: ESS Sabre ES9039Q2M
Amp chip: ESS ES9603Q x4

■ Input ports:
USB-C (Top): Audio decoding / Image transfer / Charging
USB-C (Bottom): Audio decoding / Image transfer / Firmware updates

■ Output ports: 3.5mm single-ended, 4.4mm balanced
■ USB decoding mode: UAC 2.0, UAC 1.0
■ Maximum sampling rate:
UAC 2.0: PCM 32-bit/384kHz, DSD256 (Native)
UAC 1.0: PCM 16-bit/48kHz

■ Maximum output (1kHz, THD+N < 1%):
3.5mm: ≥75mW x2 @32Ω
4.4mm: ≥180mW x2 @32Ω

■ Frequency response: 20Hz–48kHz (±0.2dB)
■ S/N ratio:
3.5mm: ≥115dB
4.4mm: ≥116dB

■ Dynamic range:
3.5mm: ≥115dB
4.4mm: ≥116dB

■ THD+N:
3.5mm: ≤0.00075%
4.4mm: ≤0.00084%

■ Noise floor:
3.5mm: <1.7μV
4.4mm: <2.7μV

■ Supported headphone impedance: 16–300Ω
■ Weight (excluding cable): 50g (±2g)
■ Dimensions: 70x45x12mm (2.76 x 1.77 x 0.47 in)