S.M.S.L - D400 Pro

Desktop Digital To Analog Converter (DAC)
Sale price₹ 59,999 Regular priceMRP: ₹ 61,999

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Color: Silver

Talk to a Headphone Guru


1. What is a Pre-Order product?
A Pre-order product is a product that we especially order for you from the brand. Once you place an order with us, we will order it from the brand for you.

2. How do I know when the product will be delivered?
There is a rough timeline on the product availability and once it has been confirmed with the brand, we will inform you.

3. Do you order the product from the brand as soon as I place the order?
We do not immediately order the product but add it in the upcoming order.

4. Will you be giving me updates?
Once we have ordered the product and have a confirmed timeline, we will give you an update.

5. I’d like to make changes to/cancel my order?
You can only cancel/make changes to your order until we place the order with the brand. Since the product is specifically being ordered for you, we will be unable to cancel/make changes once we order the product from the brand.

Free Shipping
7 Day Replacement Guarantee

In case you receive the S.M.S.L - D400 Pro with a manufacturing defect, please raise a return request within 7 days of delivery.

However, if you receive an incorrect / damaged / different product or one with missing accessories, please raise a return request within 24 hours of delivery. In case you receive a product with a missing, incorrect, or faulty accessory, you will be given a replacement accessory instead of the entire product.

Please make sure that the product is in the original packaging with all the accessories it came with. We'll also need an unboxing video and images of the parcel to investigate about the discrepancy. You may be asked to share images of the product and the packaging received for us to determine the damage or defect prior to approving the return request. The free replacement will be shipped only once the original order is returned.

A replacement will be issued only if:

- It is found to be defective
- It is determined that the product was not damaged while in your possession
- The product is not different from what was shipped to you
- The product is returned in original condition (with brand’s/manufacturer's box, MRP tag intact, user manual, warranty card and all the accessories therein)


Warranty & Services

Don't sweat it, this S.M.S.L - D400 Pro comes with a 1 Year warranty from S.M.S.L that covers manufacturing defects. All products featured on Headphone Zone are backed by an original manufacturer's warranty.

Read more about S.M.S.L's warranty in India.

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1 Year of

Ideal for Audiophiles

These DAC & Amps are designed for discerning music lovers. If audio quality is important to you, a set of DAC & Amps like these would be ideal.

You can expect these DAC & Amps to present you with a refined listening experience. The audio quality exhibited by these DAC & Amps is a beautiful mix of musicality, technical brilliance and high precision.

These DAC & Amps deliver a spacious & open soundstage that makes you feel you are sitting at a live concert. Experience the magic and delve into pure sonic tranquility!

Ideal for
Desktop Use

Bluetooth with
LDAC, aptX HD, aptX & AAC

XLR Balanced

AKM AK4191 + AK4499EX
Dual DAC Chip

Pair with Laptop via USB

A majority of people use a laptop as the primary source device to listen to music or watch movies. Since the laptop is an essential part of the audio chain there are headphones and devices designed to work a laptop or computer system flawlessly. With the availability of USB connectivity, it becomes easier to pair various devices like an Amp, DAC or even headphones without worrying about drivers or any additional piece of software.

Connect With Optical,
Coaxial, I²S & AES, USB


Volume Controls

If your DAC & Amps include volume controls or volume rockers, you can easily change the volume with a button press or volume knob turn.

DAC & Amps that have volume controls make its operation incredibly simple; turn up the volume on your smartphone or your source devices and then change the volume on DAC & Amps to the desired level.

This design feature allows you to have complete control over the desired volume according to your listening preferences.


SMSL launched the D400 Pro, an all-new DAC designed to deliver excellent sound performance, with MQA and MQA-CD decoding, which decodes MQA-encoded content from CDs using MQA technology. It provides various digital input formats and a high-resolution audio output and equips the flagship DAC chipsets AK4191 and AK4499EX, known for their high-quality audio performance. The SMSL D400 Pro features a built-in low-noise power processing, which improves power efficiency and lowers power consumption. Additionally, it features a Qualcomm high-end Bluetooth chip that supports LDAC (24bit/96kHz), aptX, aptX HD, SBC and AAC audio codecs for high-quality wireless audio transmission. SMSL also offers a full-featured remote control for enhanced convenience and control over the device's functions. It is a Hi-Res Audio and JAS Hi-Res certified product, which proves its capability to deliver sound in exceptional quality.



The SMSL D400 Pro features a flagship DAC chipset from AKM technologies, the AK4191 and AK4499EX. The chipsets are renowned for their excellent audio decoding abilities, and the SMSL D400 Pro ensures exceptional audio quality with accurate sound clarity and detail thanks to these chipsets. Speaking about the AK4499EX chip, in particular, offers an incredibly low total harmonic distortion plus noise (THD+N) level of as low as 0.00006%. The SMSL D400 Pro enables the reproduction of audio signals with utmost fidelity, minimizing distortion and preserving the original audio quality. The SMSL D400 also provides various digital filters with up to 7 modes, specially tailored for processing PCM signals. These filters allow you to fine-tune the audio output to suit your sound style by simply adjusting the frequency response or emphasizing certain aspects of the sound.



The SMSL D400 Pro utilizes the latest 3rd generation XMOS XU-316 technology to offer enhanced audio performance, ensuring that your music is delivered with the utmost quality. This advanced XMOS technology enables the DAC to support PCM audio up to 32-bit/768kHz and DSD audio up to DSD512, providing high-resolution audio playback with exceptional detail and clarity. SMSL has also equipped the D400 Pro with a high-end Bluetooth chip from Qualcomm. This Bluetooth chip supports a range of codecs, which includes the LDAC (24bit/96kHz), APTX/HD, SBC, and AAC, ensuring compatibility with various devices and delivering high-quality wireless audio transmission. The SMSL D400 Pro provides convenient and reliable Bluetooth connectivity within an effective distance of 0-15 meters, allowing you to enjoy your favourite music with a wireless connection efficiently.



The SMSL D400 Pro incorporates five high-end dual op-amps and numerous audiophile components for superior audio performance. SMSL has also featured the D400 Pro with a new self-developed CK-03 clock processing circuit which effectively reduces clock jitter for improved sound quality. Along with these components, the utilisation of a 2nd PLL helps eliminate jitter during SPDIF transmission. The SMSL D400 Pro also features a built-in low-noise power processor with multiple regulated power supplies. These components ensure stable, reliable and sufficient power with minimal noise interference.



The SMSL D400 Pro DAC supports MQA decoding, allowing you to enjoy high-resolution audio from MQA-encoded music files. It also supports MQA-CD, which means it can decode MQA-encoded content from your CDs. This feature ensures you can experience the full potential of MQA audio with authentic sound delivery. The MQA technology in your SMSL D400 Pro eliminates distortion and time blurring, resulting in lifelike and transparent audio reproduction. You can get a live performance kind of music listening experience with the all-new SMSL D400 Pro. The D400PRO DAC achieves precise sound by effortlessly decoding large-resolution files, ensuring compatibility with various playback devices.



SMSL offers versatile input and output options for connecting to various audio sources and devices. It supports input formats such as XMOS USB receiver, USB, Coaxial, Optical, I2S and AES/EBU and for output formats, it supports RCA and XLR, ensuring compatibility of your SMSL D400 Pro with a wide range of audio equipment. The SMSL D400 Pro also supports DSD transmission through USB, optical fibre, coaxial, and AES inputs, with coaxial and optical fibre supporting DOP64 for enhanced audio quality. The input and output connection terminals are gold-plated, ensuring a high-quality and reliable audio connection. The SMSL D400 Pro also supports DSD transmission through USB, optical fibre, coaxial and AES inputs and with coaxial and optical fibre supporting DOP64 for enhanced audio quality.



SMSL has crafted the D400 Pro into an aesthetically pleasing minimalist design with aluminium alloy housing and advanced manufacturing processes. The design features a fresh exterior that catches the eye, highlighted by a fully laminated display with a smooth texture and improved light transmission. The SMSL D400 Pro design features a durable tempered glass display panel and a newly designed UI interface with a non-air-gap IPS display for clear visuals. It offers a range of settings like PCM and DSD filters, sound colour adjustment and preamp mode, all of which can be easily accessed using a full-function remote control. The compact and durable remote control provided is fast and easy to use, adding to the overall user-friendly experience with your SMSL D400 Pro. You can also upgrade the firmware on your own, contributing to your seamless operational experience.

1 Year Warranty

Don't sweat it, this S.M.S.L - D400 Pro comes with a 1 Year warranty from S.M.S.L that covers manufacturing defects. All products featured on Headphone Zone are backed by an original manufacturer's warranty.

Read more about S.M.S.L's warranty in India.

Unveiling Cutting-Edge Audio Technology

Established in 2009, Foshan ShuangMuSanLin Technology Co. Ltd. is based in Shenzhen, China. S.M.S.L specializes in audio equipment including DACs, stereo headphone amplifiers, and power amplifiers. With an in-house R&D, manufacturing, and marketing team, S.M.S.L has built an extensive sales network covering 33 cities in China. Additionally, S.M.S.L has developed strategic partnerships with several countries, including Japan, Britain, Germany, Portugal, and Singapore. Their products are exported to over 30 countries worldwide and have garnered high customer satisfaction.

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