Fully Balanced Audio Decoder & Headphone Amplifier

  • ES9039MSPRO Decoding Chip
  • Output Power: 6W(16Ω)/3W(32Ω)
  • XMOS XU-316
  • Bluetooth 5.1
  • 4-XLR/4.4mm/6.35mm Headphone Output
  • PLFC Ultra-Low Distortion Circuit
  • PCM 32bit/768kHz
  • Built-In Power Supply
  • DSD Direct Stream Digital DSD512
  • Full-Featured Remote Control
Color :
Product Price
Terms & conditions

Free standard shipping to most countries

Free express shipping on orders over $270*. Enjoy free tax and duty paid to most countries. Please refer to our shipping FAQ to see if you apply.

Covid-19 Shipping Delay Notice

Shipping may be delayed due to covid-19 depending on your country regulations.
Free Shipping

Authenthic Products

Linsoul Audio is the authorized distributor. All products are authentic and genuine.

Free Shipping

Worldwide Free Shipping

We are located in China but send our products worldwide for free. T&Cs apply.


1 Year Warranty

We provide 1 year warranty for the all products except the cables*.

Flagship DAC for Superior Sound Quality

Experience audio in its purest form. The SMSL DO400 is equipped with the ES9039MSPRO, ESS company's flagship DAC chip, boasting 8 channels and offering unmatched dynamic range and low distortion.

Revolutionary MQA Technology

Unfold music's deepest layers. With MQA decoding, immerse yourself in a truly accurate 3D sound field, recreating the magic of live performances. Whether through USB, Optical, Coaxial, or AES, the DO400 breathes life into every note.

Powerful Headphone Amplification

Whether you're using high or low impedance headphones, the DO400 is tailored to deliver the optimal power. With output power ranging from 350mW to a staggering 6000mW, every beat resonates.

Comprehensive Connectivity

Six input options, three headphone outputs, and two line outputs. Be it USB, Bluetooth, Optical, Coaxial, AES/EBU, or 12S (HDMI) input, this device adapts to your audio needs. Simultaneously enjoy multiple outputs, including 4-XLR, 4.4mm, and 6.35mm.

State-of-the-Art Bluetooth 5.1

Go wireless without compromise. Powered by Qualcomm's latest Bluetooth 5.1 chip, the DO400 supports LDAC, APTX/HD, SBC, and AAC, ensuring high-resolution audio over the air.

Elegant Design with Functional Remote Control

The suspended display window paired with a retro knob gives the DO400 a vintage charm, while its full-featured remote control enhances user convenience.

Ultra-Low Distortion Circuitry

Achieve audio clarity like never before. With its PLFC ultra-low distortion headphone amp, enjoy distortion levels as low as 0.0001% under a 16Ω load.

RCA/XLR/4.4mm Headphone Jack/6.35mm Headphone Jack/4-Pin XLR Headphone Jack
Line Output Amplitude:
XLR: 5.2VrmsRCA: 2.5Vrms
Headphome Output Power:
6000mW x2(16Ω)700mW x2(300Ω)3000mW x2(32Ω) 350mW x2(600Ω)
XLR: 0.00005%(-125dBXUN-WTD)RCA: 0.00007%(-123dBXUN-WTD)HPA: 0.00009%(-120dBXUN-WTD)
Dynamic Range:
XLR: 133dBRCA: 128dBHPA: 126dBSNR:XLR: 133dBRCA: 128dBHPA: 126dB
Output Impedance:
Line out: 100ΩHPA out: near 0Ω
HPA High Gain:
Balanced: +20dBUnbalanced: +14dB
USB Transmission
USB Compatibility
Windows 7/8/8.1/10/11(Needs Driver)Mac OSX10.6以上、Linux(Driverless)
Sampling rate & Bit Width:
USB: PCM 44.1-708kHz(32bit)DSD: 2.8224-22.5792MHz (1bit)Opt/Coax: 44.1-192kHz(24bit)
MQA Decoder
USB / Optical / Coaxial / AES
MQA-CD Decoder
Optical / Coaxial / AES
Support SBC,AAC,aptX,aptX HD,LDAC
Power Consumption
Standby Powor

Coming soon...


Coming soon...

Customer Reviews

Be the first to write a review
Our Shipping Process

If everything goes right our system will automatically generate your order and send you a confirmation email. If you don't receive the confirmation email please double-check that it wasn't automatically stored in your spam or promotions folder.

3 Working Days*

Most of the items you see are in stock and ready to be shipped after 3 working days. If you plan to order a custom (Design or Fit) product, a pre-order, or a made to order item processing times may change on item to item basis.

Standard Shipping
15 to 30 Days.

Standard shipping is offered free worldwide for orders under $269 USD (with some exceptions), but please consider that delivery times may vary considerably depending on your country, up to 90 Days.

Express Shipping
3-6 Working Days.

Most items over $270 include free express shipping (DHL or similar). If your order total is under $270 you can manually add Express Shipping at the checkout page for $15.00 - $35.00USD

World-Wide Shipping

Shipping FAQ

Which countries do you ship to?

We are generally able to ship to most countries via Express Shipping, and many countries via Standard Shipping. You may clarify this with our team to check whether Standard Shipping is available to your country.

We cannot ship to addresses that are "PO boxes or APO/FPO".

*Note: Generally, we can only do Selected Shipping to India and Russia. We can only do Express Shipping to Africa, Argentina, Hawaii, Kuwait, Mauritius, Montenegro and Sri Lanka, to name a few.
This may be subjected to changes due to unpredictable issues such as Covid, war, and etc.

How much does shipping cost?

We have two shipping methods - Standard Shipping and Express Shipping.

Standard Shipping is free for most countries, while Express Shipping is 15-35USD depending on your country. If your order is over 270USD, Express Shipping is free*. 

*This applies for most countries. However, large items such as headphones and desktop DAC/AMPs (e.g. HarmonicDyne G200, MUSICIAN MDP-2, and etc.) are excluded.

Shipping fees exclude import taxes or processing fees that may be applicable for your country. Linsoul is not responsible for such fees. Should you refuse to pay the tax/customs fees, shipping fees will still be deducted from the amount paid for the two-way freight charges. The cost of the freight charges may be more than the amount reflected on your order due to tax and other miscellaneous fees.

Some parcels claimed to be “returned to the seller” may be destroyed by the post office or customs officers when buyers refuse to accept their parcels or fail to pay for their taxes. No refund will be processed for such cases.

Standard Shipping via YunExpress is a tax-inclusive option for some countries. However, Linsoul will not be responsible for additional administrative or handling fees charged by your local courier company or customs. Please kindly check this with your local customs.

For certain remote areas, there may be additional charges via Express Shipping. We will contact you if there is a need to make additional payments. 
Please contact us before placing an order, should you have any queries regarding shipping.  

How long does it take to receive the order after it is placed?

For in-stock products, your order will be shipped within 3 working days. You may check with our staff regarding the in-stock status of any products. 

Customized items will take a longer time. Please contact our staff for more information.

On normal non-sale days, once your parcel has been shipped out:

  • For Standard Shipping, it takes about 2-4 weeks for items to be delivered after shipping out. For some countries, it might take up to 2-3 months, depending on your country, its customs and other factors.* The duration for transit is something beyond our control. Linsoul will not be making refunds for such cases. Please consider an upgrade to Express Shipping or keep the waiting time in mind.
  • For Express Shipping, it takes about 3-7 days for items to be delivered after shipping out.

*Note: Timings might be affected due to festive seasons or other unforeseen circumstances

What happens if the parcel has been shipped but not delivered?
  1. First, kindly contact your local courier using the local tracking number.
    If your parcel were to be in transit for at least 3 months, it may have been lost in transit.
    For orders below $50USD, you may either opt for a one-time reshipment of parcel OR a full refund of the amount paid in cash via PayPal/Credit/Debit card.
    For orders above $50USD, we will only process a 50% refund of your order paid in cash via PayPal/Credit/Debit card. Should there be any concern about Standard Shipping, you are encouraged to opt for DHL Express Shipping instead.
  2. Customers are to bear the consequences and fees incurred, if the parcel was undelivered due to any of the following situation:
    • Wrong address or phone number provided by recipient
    • Recipient was uncontactable when courier company contacted
    • Refusal to sign for the package by recipient
    • Lost or damaged parcel because recipient opted for “no-signature delivery”
    • Refusal to pay for the local tax/processing fee by recipient
    • Refusal to provide supporting documents for custom clearance by recipient
Who will pay for the import tax/custom fees

Customers have to bear any form of custom/import/processing fees that are applicable for your parcel.

Should you be unwilling to pay for the fees and reject the delivery of the parcel, you will still have to pay for the shipping cost. Linsoul will only refund the amount of your order after deducting the two-way shipping fees incurred.

How do I get help for my order?

Cancellation or/and modification of orders can only be done manually via our staff, provided that our Warehouse Team has not processed your order.
As our Support Team might not be available during non-working days and weekends, please place your order wisely.
Should you really need to cancel or/and modify your order after purchase, please contact us via our support email ( or website chat. We will help you with the changes if that could be done.

In general, upon receiving your parcel, please confirm the contents of the package and ensure that the package is in good condition before signing for it. All customers are strongly advised to take an unboxing video of their parcel and packaging when opening their parcels and products.

For faulty/missing items, please send an email to for after-sale services. The following details are required.
1) Send an email to with an appropriate Subject Title 
2) Provide your order number and state the issue clearly
3) Attach photos and videos to show that your product is faulty/missing. Shipping details on the parcel packaging have to be clearly visible.

If the photos/videos provided are insufficient to prove the stated issue, we will enquire more. Once the issue has been confirmed, we will arrange for a replacement, partial refund or a full refund (where applicable). For incorrect products, Linsoul reserves all rights in deciding whether you need to return the incorrect item or not. Please kindly contact us via email first. Our team aims to review your email within 3 working days.

For other queries, the fastest way to contact us is via our website or Discord

Linsoul Audio will not be responsible for parcels that have been damaged during the transit process.

Do I get tracking details for my order?

After placing an order, you will receive the order confirmation email. After your order has been shipped out, you will also receive a tracking email. You can track your order via the tracking number online. Should you not have received the emails or face any difficulties tracking your order, please kindly contact us for support.

For more than 1 orders placed under the same account and shipping address, Linsoul will automatically combine the orders and ship them out via one tracking number. Should you have special requests to have the orders shipped separately, please kindly contact us via Discord or our website's chat. We will do our best to help.

What shipping companies do you use?

We collaborate with these courier companies:
Standard Shipping: 4PX, UBI, NinjaVan, and Yun Express
Express Shipping: DHL Express, FedEx and SF Express

Last updated: 1 November 2022

You have successfully subscribed!
This email has been registered