- Fosi Audio MD3
- User Manual
- USB-C to USB-C Adapter
- Quick Guide
Trusted & Verified
Fosi Audio MD3 Portable Magnetic DAC Headphone Amplifier USB-C (Black)
- Portable USB-C DAC and headphone amplifier for phones, tablets, laptops, and mobile setups
- Magnetic design helps reduce dangling dongle clutter with compatible phone setups
- ESS Sabre ES9039Q2M DAC supports up to PCM 32bit/384kHz and native DSD256
- 3.5mm single-ended and 4.4mm balanced outputs support wired headphones and IEMs
- Dual USB-C ports allow listening while charging with supported connections
- Custom circular display supports uploaded images, emojis, and animations
- Compact 50g body measures 70 × 45 × 12 mm for pocket-sized carry
The Fosi Audio MD3 MagDac Portable DAC Headphone Amplifier brings wired HiFi listening to phones, tablets, laptops, and portable setups through a compact USB-C design. Its magnetic back helps the amplifier attach securely to compatible phone setups, reducing cable drag while keeping the device close to your source for cleaner everyday carry.
High Resolution DAC Performance
Powered by an ESS Sabre ES9039Q2M DAC with ESS ES9603Q amplifier chips, the MD3 supports up to PCM 32bit/384kHz and native DSD256 through UAC 2.0. It gives listeners a dedicated audio path for IEMs and headphones, with support for both 3.5mm single-ended and 4.4mm balanced connections.
Listen While Charging
Dual USB-C ports help solve a common portable audio problem. The top USB-C port supports audio decoding, image transfer, and charging, while the bottom USB-C port supports audio decoding, image transfer, and firmware upgrade. This layout lets users keep music playing while power is connected during commutes, desktop sessions, travel, or gaming.
Personalized Circular Display
The MD3 adds a customizable circular display for a more interactive portable audio setup. Users can upload images, emojis, and animations, while the Vista Button adds direct control over supported display functions. At 50g without cable and 70 × 45 × 12 mm, the MD3 is made for compact daily carry without sacrificing balanced output capability.
Product:
| Brand | Fosi Audio |
| Model | MD3 MagDac |
| Product Type | Portable DAC Headphone Amplifier |
Chipset
| DAC | ESS Sabre ES9039Q2M |
| Amplifier Chips | ESS ES9603Q ×4 |
Input
| USB-C Top Port | Audio Decoding, Image Transfer, Charging |
| USB-C Bottom Port | Audio Decoding, Image Transfer, Firmware Upgrade |
Output
| Headphone Outputs | 3.5mm Single Ended, 4.4mm Balanced |
USB Audio
| USB Audio Class | UAC 2.0, UAC 1.0 |
| UAC 2.0 Max Sampling Rate | PCM 32bit/384kHz, DSD256 Native |
| UAC 1.0 Max Sampling Rate | PCM 16bit/48kHz |
Audio Performance
| 3.5mm Max Output Power | ≥80mW ×2 @32Ω, 1kHz, THD+N <1% |
| 4.4mm Max Output Power | ≥180mW ×2 @32Ω, 1kHz, THD+N <1% |
| Frequency Response | 20Hz to 48kHz, ±0.2dB |
| 3.5mm SNR | ≥115dB |
| 4.4mm SNR | ≥116dB |
| 3.5mm Dynamic Range | ≥115dB |
| 4.4mm Dynamic Range | ≥116dB |
| 3.5mm THD+N | ≤0.00075% |
| 4.4mm THD+N | ≤0.00084% |
| 3.5mm Noise Floor | <1.7μV |
| 4.4mm Noise Floor | <2.7μV |
| Recommended Headphone Impedance | 16 to 300Ω |
Physical
| Weight Without Cable | 50g, ±2g |
| Dimensions | 70 × 45 × 12 mm, 2.76 × 1.77 × 0.47 in |
Starting at $12.49/mo
Estimated over 12 months with Affirm, subject to eligibility and approval.
Flexible payment options available
Interest-free installments and monthly financing may be available through Shop Pay on eligible purchases.
Starting at $37.50
No interest if paid in full by the promotional terms. Minimum monthly payments required and subject to credit approval.
Shipping Policy
Orders of $25 or more qualify for free standard shipping on eligible items.
Most in-stock orders placed before 1 PM EST Monday–Thursday ship the same business day. View Shipping Policy
Free Local Pickup
Please call for store stock availability. Requests made before 2:30 PM EST can be available for next-day pickup. Learn more
Tab: Frequently Asked Questions
How do I return an item?
How do I return an item?
Returns are incredibly simple. Please log into your account, find your item you wish to return and follow the prompts to make a return. If you do not have an account, click here to find your order and make a return.
Will I receive a full refund when I return an item?
Will I receive a full refund when I return an item?
You will receive a full refund when you return an item in its original manufacturer’s packaging, undamaged and unmarked. If the item you are returning is priced at less than $35, you will be charged a 15% restocking fee. Please note you will not be refunded any shipping charges.
How many days do I have to make a return?
How many days do I have to make a return?
You have 30 days to make a return. During the holiday season, from November 1 to December 31, we extend the return window to 60 days.
My item was damaged in transit. How do I place a return?
My item was damaged in transit. How do I place a return?
If your order has been noticeably damaged in transit, we strongly recommend that you refuse delivery and notify us immediately. Claims for missing items or items damaged in transit must be made within 48 hours of delivery. If there is carrier damage, please contact support@focuscamera.com with your order number and a description of the damage.
There’s an issue with my order, what should I do?
There’s an issue with my order, what should I do?
Oh no! Please contact our customer service team so we can resolve the issue immediately. You can call us on 1.800.221.0828, email us at support@focuscamera.com, or send us a message here.
Can I exchange an item?
Can I exchange an item?
We do not currently offer exchanges. Please return the item you purchased within 30 days and order what you’d like instead.
If I ordered a kit, do I have to return all the items?
If I ordered a kit, do I have to return all the items?
If you ordered a kit, you must return all components and accessories to receive a full refund.
I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?
I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?
If you ordered a product that included a free item, you must include the free item with your return. If not, your return will not be accepted and you will not receive a full refund.
Do you offer repairs?
Do you offer repairs?
We currently only offer camera repairs at our Brooklyn store. The item must be dropped off and collected in person as we do not accept shipped items for repair. For more information, please call our Brooklyn store on 1.718.431.7900.
What is your return policy?
What is your return policy?
Most items can be returned within 30 days for a full refund. Click here to read our full return policy.
