The Fosi Audio MD3 MagDAC Portable DAC & Headphone Amplifier delivers high-resolution audio with an ESS Sabre ES9039Q2M DAC, PCM support up to 32-bit/384kHz, and native DSD256 playback. Featuring magnetic MagSafe-style attachment, a customizable rear display, and 3.5mm single-ended and 4.4mm balanced headphone outputs, the MD3 combines premium sound quality with everyday portability. Dual USB-C connections enable simultaneous listening and pass-through charging, while its lightweight 50-gram design makes it an ideal companion for compatible smartphones, tablets, and computers.
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Fosi Audio MD3 MagDAC Portable DAC & Headphone Amplifier

Experience high-resolution audio wherever you go with the Fosi Audio MD3 MagDAC Portable DAC & Headphone Amplifier, an innovative magnetic USB-C DAC designed to bring premium sound quality, convenience, and personalization to your everyday listening. Featuring a flagship ESS Sabre ES9039Q2M DAC and four ESS ES9603Q amplifier chips, the MD3 delivers detailed, low-distortion audio with support for PCM up to 32-bit/384kHz and native DSD256. With a compact magnetic design, customizable rear display, and both 3.5mm single-ended and 4.4mm balanced headphone outputs, the MD3 transforms compatible smartphones, tablets, and computers into high-performance portable listening systems.

Designed for music lovers who want exceptional sound without carrying bulky equipment, the MD3 features a strong N52 magnetic attachment system that securely connects to compatible MagSafe-style smartphones and cases. Its lightweight, pocket-sized construction weighs approximately 50 grams and features rounded corners with a premium leather-finished surface for a comfortable, refined appearance. Whether you're commuting, traveling, working, or relaxing at home, the MD3 keeps your DAC conveniently attached to your phone while delivering the clarity and dynamics expected from a dedicated headphone amplifier.

At the heart of the MD3 is its fully balanced amplification system, delivering at least 180mW per channel into 32 ohms through the 4.4mm balanced headphone output and at least 80mW per channel through the standard 3.5mm connection. Supporting headphones with impedances ranging from 16 to 300 ohms, the MD3 offers flexible pairing with modern in-ear monitors, audiophile headphones, and other compatible wired listening devices. Its ESS Sabre DAC and ultra-low noise floor help preserve subtle musical details, accurate instrument separation, and dynamic contrast across a wide range of music genres.

One of the MD3's most convenient features is its dual USB-C design, which supports simultaneous music playback and pass-through charging. Connect an external power source to the upper USB-C port while using the lower USB-C connection with your phone, allowing you to keep listening while your device charges. The MD3 also features a customizable rear display that can showcase personal photos, favorite images, emojis, and animations. Built-in mini games, including Rolling Dice, Wine Bottle, and Rock Paper Scissors, add a playful element to this unique portable audio device. Combining premium audio components, magnetic convenience, and personalized visual features, the Fosi Audio MD3 MagDAC is an excellent companion for anyone looking to upgrade their mobile listening experience.

Specifications

• Brand: Fosi Audio
• Model: MD3 MagDAC
• Product Type: Portable magnetic USB DAC and headphone amplifier
• DAC Chip: ESS Sabre ES9039Q2M
• Amplifier Chips: ESS ES9603Q ×4
• Amplification Design: Balanced headphone amplification
• USB Connectivity: Dual USB-C ports
• Upper USB-C Port: Audio decoding, image transfer, and charging input
• Lower USB-C Port: Audio decoding, image transfer, and firmware upgrades
• Pass-Through Charging: Supports simultaneous listening and charging through the dual USB-C configuration
• USB Audio Classes: UAC 1.0 and UAC 2.0
• UAC 2.0 Maximum PCM Resolution: 32-bit/384kHz
• UAC 2.0 DSD Support: Native DSD256
• UAC 1.0 Maximum Resolution: 16-bit/48kHz PCM
• Headphone Outputs: 3.5mm single-ended and 4.4mm balanced
• 3.5mm Output Power: At least 80mW ×2 at 32 ohms (1kHz, THD+N below 1%)
• 4.4mm Balanced Output Power: At least 180mW ×2 at 32 ohms (1kHz, THD+N below 1%)
• Supported Headphone Impedance: 16–300 ohms
• Frequency Response: 20Hz–48kHz (±0.2dB)
• 3.5mm Signal-to-Noise Ratio: At least 115dB
• 4.4mm Signal-to-Noise Ratio: At least 116dB
• 3.5mm Dynamic Range: At least 115dB
• 4.4mm Dynamic Range: At least 116dB
• 3.5mm Total Harmonic Distortion + Noise: 0.00075% or less
• 4.4mm Total Harmonic Distortion + Noise: 0.00084% or less
• 3.5mm Noise Floor: Less than 1.7µV
• 4.4mm Noise Floor: Less than 2.7µV
• Magnetic Attachment: MagSafe-style magnetic mounting system
• Magnet Type: Strong N52 magnets
• Compatible Mounting: MagSafe-compatible smartphones and magnetic cases
• Display: 1.28-inch customizable rear LCD display
• Display Customization: Personal images, photos, emojis, and animations
• Built-In Display Features: Photo album and interactive mini games
• Mini Games: Rolling Dice, Wine Bottle, and Rock Paper Scissors
• Design: Compact portable enclosure with rounded corners
• Exterior Finish: Premium leather-finished surface
• Available Colors: Galaxy and Obsidian
• Dimensions: 70 × 45 × 12mm (2.76 × 1.77 × 0.47 inches)
• Weight: 50g ±2g (approximately 0.11 lb), excluding cable
• Audio Source Compatibility: Compatible USB-C smartphones, tablets, and computers supporting USB audio output
• Firmware Updates: Supported through the lower USB-C port
• Manufacturer Warranty: 24 months
• Included Accessories: Fosi Audio MD3 MagDAC, USB-C to USB-C adapter, user manual, and quick guide

What It's Great At

• High-Resolution Portable Audio: The ESS Sabre ES9039Q2M DAC supports PCM up to 32-bit/384kHz and native DSD256, delivering precise digital-to-analog conversion for detailed music playback from compatible USB-C devices.
• Convenient Magnetic Smartphone Attachment: Strong N52 magnets allow the MD3 to attach to MagSafe-compatible phones and cases, creating a compact listening setup without a freely dangling DAC.
• Balanced Headphone Amplification: Four ESS ES9603Q amplifier chips provide at least 180mW per channel at 32 ohms through the 4.4mm balanced output, offering substantial power for compatible IEMs and wired headphones.
• Listen While Charging: Dual USB-C connectivity allows compatible smartphones to charge while the MD3 continues processing audio, making it particularly useful during long listening sessions, travel, and everyday use.
• Customizable Rear Display: The personalized display supports photos, images, emojis, animations, and interactive mini games, adding a unique visual experience to a high-performance portable DAC.
• Lightweight Everyday Portability: Weighing approximately 50 grams and measuring just 12mm thick, the MD3 fits easily into pockets and travel bags while providing a refined alternative to conventional USB dongle DACs.

FAQ Section

Q: What is the Fosi Audio MD3 MagDAC?
A: The Fosi Audio MD3 MagDAC is a portable USB-C digital-to-analog converter and headphone amplifier designed to improve wired headphone sound quality when connected to compatible smartphones, tablets, and computers. It combines high-resolution audio processing, magnetic smartphone attachment, balanced headphone amplification, and a customizable rear display.

Q: Does the Fosi Audio MD3 support high-resolution audio?
A: Yes. The MD3 uses an ESS Sabre ES9039Q2M DAC and supports PCM audio up to 32-bit/384kHz and native DSD256 in USB Audio Class 2.0 mode. It also supports USB Audio Class 1.0 playback up to 16-bit/48kHz for compatibility with supported devices.

Q: Does the Fosi Audio MD3 work with iPhones and Android smartphones?
A: The MD3 is designed for compatible USB-C smartphones, including supported USB-C iPhones and Android devices. Its magnetic attachment works with MagSafe-compatible phones and magnetic cases, while audio playback requires a compatible USB connection. Magnetic attachment and USB audio compatibility should be verified for individual devices and cases.

Q: Can I charge my phone while using the Fosi Audio MD3?
A: Yes. The MD3 features dual USB-C connectivity with pass-through charging support. Connecting external power to the upper USB-C port while the lower port is connected to a compatible smartphone allows the phone to charge while music continues playing.

Q: Does the Fosi Audio MD3 have a balanced headphone output?
A: Yes. The MD3 features a 4.4mm balanced headphone output delivering at least 180mW per channel at 32 ohms. It also includes a standard 3.5mm single-ended connection delivering at least 80mW per channel at 32 ohms, making it compatible with a wide selection of wired headphones and in-ear monitors.

Q: Can I customize the display on the Fosi Audio MD3?
A: Yes. The MD3 features a customizable rear display that supports personal photos, images, emojis, and animations. It also includes a photo album and interactive mini games such as Rolling Dice, Wine Bottle, and Rock Paper Scissors, bringing a personalized element to your portable listening setup.

Q: Is the Fosi Audio MD3 powerful enough for audiophile headphones?
A: The MD3 supports headphones with rated impedances between 16 and 300 ohms and offers both 3.5mm single-ended and 4.4mm balanced amplification. Its balanced output provides at least 180mW per channel at 32 ohms, making it well suited to many modern IEMs and portable headphones, although particularly demanding headphones may benefit from a more powerful dedicated amplifier.

Q: How portable is the Fosi Audio MD3 MagDAC?
A: The MD3 measures just 70 × 45 × 12mm and weighs approximately 50 grams without its cable. Its slim design, rounded corners, premium exterior finish, and magnetic attachment make it convenient for commuting, traveling, working, and listening to high-resolution music on the go.