S.M.S.L D400 MK2 Flagship Audio DAC
The S.M.S.L D400 MK2 represents the pinnacle of modern digital-to-analog conversion, combining state-of-the-art flagship silicon with uncompromising audio engineering. Designed for discerning audiophiles and high-end desktop setups, it delivers master-grade resolution, ultra-low distortion, and an expansive soundstage that brings every nuance of your music to life.
Flagship AK4191 and AK4499EX DAC Architecture
At the heart of the D400 MK2 is AKM’s premier dual-chip architecture, utilizing the AK4191 digital filter paired with the AK4499EX DAC, driven by the third-generation XMOS XU-316 processor. By physically separating the digital processing from the analog conversion stage, this design drastically reduces noise interference and digital jitter. The result is an exceptionally pure, transparent, and lifelike audio reproduction with pinpoint imaging and rich textural detail.
Ultra-Low Phase Noise OCXO Clock
To ensure absolute signal integrity, the D400 MK2 incorporates a built-in high-precision 10MHz OCXO (Oven-Controlled Crystal Oscillator) with ±5ppb stability, paired with SMSL's self-developed CK-04 clock processing circuit. These specialized systems maintain extreme thermal stability, virtually eliminating phase noise and ensuring master-clock precision.
MQA and High-Resolution Audio Decoding
The D400 MK2 provides comprehensive hardware support for the industry's most demanding formats. It natively decodes PCM audio up to 32-bit/768kHz and Direct Stream Digital up to DSD512. Additionally, full MQA and MQA-CD decoding capabilities allow listeners to stream or play back studio-original master recordings precisely as the artist intended.
High-Performance Qualcomm Bluetooth Connectivity
Equipped with a flagship Qualcomm Bluetooth chipset, the D400 MK2 supports high-definition wireless streaming protocols including LDAC (24-bit/96kHz), aptX HD, aptX, AAC, and SBC. This ensures that users can enjoy seamless, high-resolution wireless audio from smartphones, tablets, or laptops without sacrificing sonic fidelity.
Versatile Balanced and Single-Ended Outputs
To integrate effortlessly into any audio system, the D400 MK2 features professional-grade analog outputs complete with ultra-low distortion metrics.
About SMSL
Foshan ShuangMuSanLin Electronics Co., Ltd. (SMSL) is an established manufacturer in high-fidelity desktop audio. Specializing in digital-to-analog converters, balanced headphone amplifiers, and power amps, SMSL has built a global reputation for combining rigorous bench performance, clean industrial design, and practical feature sets across various price tiers.
Technical Specifications
Input: USB / Optical / Coaxial / Bluetooth / AES / I2S
Output: XLR / RCA
THD+N: 0.00006% (-124dB)
USB Compatibility: Windows 7/8/8.1/10/11, Mac OS X, Linux
Bluetooth Support: LDAC (24-bit/96kHz), aptX HD, aptX, SBC, AAC
Sampling Rate (USB/I2S/AES): PCM up to 32-bit/768kHz, DSD up to DSD512
Sampling Rate (Optical/Coaxial): PCM up to 24-bit/192kHz, DSD64 (DoP)
Clock: 10MHz OCXO (±5ppb)
Display: Tempered glass full-laminated color IPS screen
Q&A
What DAC chips does the SMSL D400 MK2 use?
It uses flagship AKM chips consisting of 1x AK4191 and 1x AK4499EX.
What is the clock system inside the D400 MK2?
It features a built-in 10MHz OCXO crystal oscillator with ±5ppb stability and a CK-04 clock circuit.
Does the D400 MK2 support Bluetooth streaming?
Yes, it features a high-end Qualcomm Bluetooth chip supporting LDAC (24-bit/96kHz), aptX HD, and more.
What is the maximum sampling rate supported via USB?
PCM up to 32-bit/768kHz and native DSD up to DSD512.
Does the unit feature balanced outputs?
Yes, it comes with high-quality balanced XLR and single-ended RCA analog outputs.
