SMSL
SMSL D400 MK2 Audio DAC (AK4191 + AK4499EX)
SMSL D400 MK2 Audio DAC (AK4191 + AK4499EX)
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SMSL D400 MK2
2026 Master-Class Audio DAC
Combining staggering acoustic performance with flawless precision. Engineered for audiophiles, it extracts the absolute maximum potential from your digital audio, setting a new benchmark for desktop systems.
Key Technologies
Flagship AKM
AK4191 + AK4499EX layout. Achieves an unprecedented 0.00006% (-124dB) distortion rate.
OCXO Clock
Built-in ±5ppb 10MHz Oven-Controlled Crystal Oscillator eliminates jitter perfectly.
XMOS XU-316
Native DSD512 and 32bit/768kHz PCM. Full MQA and MQA-CD hardware decoding.
Hi-Res Wireless
Qualcomm Bluetooth supporting LDAC, aptX-HD, aptX, SBC, and AAC formats.
Low-Noise Power
Multiple low-noise regulated power supplies ensure a pristine, black audio background.
Color IPS Display
Fully laminated tempered glass display within a premium CNC-machined aluminum shell.
Understanding the D400 Series
Why choose the MK2 over the EX, ES, or PRO?
The D400 ES, EX, and PRO models have been officially discontinued. We analyzed the best components of our previous lineup and engineered the MK2 to be the ultimate successor.
Does it support direct DSD and MQA playback?
Yes. The device utilizes a dedicated DSD direct access function (DSD Bypass). When enabled, the DSD signal is not processed by the internal volume control, delivering a pure, unaltered analog output directly to your amplifier. Full MQA and MQA-CD unfolding is also natively supported.
What are the interface and display features?
It features a fully laminated color IPS display covered by tempered glass for intuitive operation. Connectivity includes USB, Optical, Coaxial, AES/EBU, I2S (HDMI), alongside both Balanced (XLR) and Unbalanced (RCA) line outputs.
Technical Specifications
Inputs
USB / Optical / Coaxial / I²S / Bluetooth / AES
Outputs & Levels
XLR (Balanced): 5.0 Vrms
RCA (Unbalanced): 2.5 Vrms
THD+N
0.00006% (-124dB) (UN-WTD)
Dynamic Range & SNR
XLR: 132dB
RCA: 126dB
Sampling Rates
USB / I²S: PCM up to 32bit/768kHz, DSD up to 512
Opt/Coax: PCM up to 24bit/192kHz
Dimensions & Weight
W 254 x H 46 x D 189 mm
1.9 kg / 4.18 lbs
D400 Series Matrix
| Specifications | D400 MK2 New Flagship | D400 EX | D400 PRO | D400 ES |
|---|---|---|---|---|
| Availability | In Production | Discontinued | Discontinued | Discontinued |
| Pricing (USD) | $649.00 | $959.99 | $619.00 | $549.99 |
| DAC Architecture | AK4191 + AK4499EX | AK4191 + 2x AK4499EX | ES9039PRO | ES9039MSPRO |
| Clock System | Built-in 10MHz OCXO | CK-03 Standard | Standard | CK-03 Standard |
| Distortion (THD+N) | 0.00006% (-124dB) | 0.00006% (-124dB) | Ultra-Low | 0.00005% (-125dB) |
| USB Controller | XMOS XU-316 | XMOS XU-316 | XMOS XU-316 | XMOS XU-316 |
| Max Decoding | PCM 768kHz / DSD512 | PCM 768kHz / DSD512 | PCM 768kHz / DSD512 | PCM 768kHz / DSD512 |
| Dynamic Range (XLR) | 132dB | 133dB | >133dB | 133dB |
| Op-Amp Quantity | 5x Premium Dual | 9x Premium Dual | Flagship Array | 11x Premium Dual |
| Output Level (XLR) | 5.0 Vrms | 5.2 Vrms | 5.2 Vrms | 5.2 Vrms |
| Bluetooth & MQA | LDAC / aptX-HD / MQA-CD | LDAC / aptX-HD / MQA-CD | LDAC / aptX-HD | LDAC / aptX-HD / MQA-CD |
