{"product_id":"smsl-d400-mk2-high-resolution-usb-desktop-dac","title":"SMSL D400 Mk2 High Resolution USB Desktop DAC","description":"\u003ch1\u003e\u003cstrong\u003eFlagship DAC with 5 Dual Op-Amps\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe D400 MK2 is a high-performance desktop DAC built around AKM’s flagship AK4191 and AK4499EX conversion architecture, third-generation XMOS XU-316 processing, a precision 10 MHz OCXO clock, and five dual op-amps. It supports PCM up to 32-bit\/768 kHz, native DSD512, MQA and MQA-CD decoding, plus LDAC Bluetooth playback up to 24-bit\/96 kHz. RCA and XLR analog outputs provide flexible integration with headphone amplifiers, preamplifiers, and other audio components.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFlagship AKM conversion\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe D400 MK2 combines the AK4191 digital processing stage with the AK4499EX DAC for low-noise, low-distortion conversion. Measured XLR performance reaches 132 dB dynamic range and 132 dB SNR, with THD+N rated at 0.00006% (-124 dB, unweighted). The architecture is designed to preserve low-level detail while maintaining accurate channel performance across demanding digital sources.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eThird-generation XMOS processing\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAn XMOS XU-316 digital processing platform handles high-resolution USB and I²S signals. USB and I²S PCM playback is supported from 44.1 kHz through 768 kHz, while DSD support extends from 2.8224 MHz through 22.5792 MHz, including native DSD512. USB and I²S support 1-bit and 16- to 32-bit data.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eMQA and MQA-CD decoding\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eHardware support includes MQA decoding through USB, optical, and coaxial inputs, along with MQA-CD playback. This allows compatible encoded material to be decoded directly by the D400 MK2 rather than relying entirely on upstream software processing.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003ePrecision OCXO clocking\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA built-in ±5 ppb, 10 MHz oven-controlled crystal oscillator provides a stable timing reference for digital conversion. SMSL’s CK-04 clock processing circuit further addresses timing jitter before conversion, helping maintain consistent signal timing and stereo imaging.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eComprehensive digital inputs\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDigital connectivity includes USB, optical, coaxial, AES\/EBU, I²S, and Bluetooth. I²S supports native DSD transmission, while coaxial and optical connections support DoP64. A dedicated DoP indicator provides a clear visual reference when compatible DSD-over-PCM signals are being received.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eHigh-resolution Bluetooth\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA Qualcomm Bluetooth platform supports LDAC, aptX HD, aptX, SBC, and AAC codecs. LDAC playback reaches 24-bit\/96 kHz at up to 990 kbps, giving the D400 MK2 a wireless input option for compatible phones, tablets, computers, and streamers without replacing its higher-bandwidth wired connections.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eIndependent low-noise power regulation\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eSeparate low-noise voltage regulation supplies the DAC, op-amp, digital, and analog sections independently. This power architecture is intended to reduce interaction between critical circuit stages while maintaining stable operating conditions throughout the signal path.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFive dual op-amps\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFive high-grade dual op-amps form part of the D400 MK2 analog stage. Combined with dedicated power regulation and the AKM conversion platform, the output circuitry is designed for low residual noise and distortion across both RCA and XLR connections.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCNC-machined aluminum chassis\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe enclosure is machined from a single block of aerospace-grade aluminum alloy. Its rigid all-metal construction provides electromagnetic shielding for the internal circuitry while creating a clean, durable exterior suited to a desktop audio system.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFully laminated color display\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA tempered-glass, fully laminated IPS color display presents input, decoding, and operating information with wide viewing angles and clear visibility. The front panel also includes a multifunction control knob, indicator light, and infrared remote receiver.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eGold-plated connections\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eGold-plated input and output terminals provide strong oxidation resistance and reliable electrical contact over repeated use. The rear panel includes balanced XLR outputs, RCA outputs, AES\/EBU, coaxial, optical, USB, and I²S digital inputs, along with the Bluetooth antenna and AC power inlet.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRemote operation\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe supplied remote provides power control, directional navigation, menu and confirmation functions, input selection, mute, programmable FN control, and volume adjustment. Core functions can be accessed without reaching for the front-panel control.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAK4191 plus AK4499EX flagship AKM DAC architecture\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThird-generation XMOS XU-316 digital processing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePCM decoding up to 32-bit\/768 kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNative DSD playback up to DSD512\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMQA decoding and MQA-CD support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in ±5 ppb, 10 MHz OCXO\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCK-04 clock processing circuit\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFive high-grade dual op-amps\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLDAC Bluetooth playback up to 24-bit\/96 kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB, optical, coaxial, AES\/EBU, I²S, and Bluetooth inputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and RCA analog outputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully laminated IPS color display\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCNC-machined aluminum chassis\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGold-plated input and output terminals\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHi-Res Audio certified\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRemote control included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDAC chipset: AK4191 plus AK4499EX\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB processor: Third-generation XMOS XU-316\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInputs: USB, optical, coaxial, I²S, Bluetooth, AES\/EBU\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutputs: RCA, XLR\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXLR output level: 5 Vrms\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRCA output level: 2.5 Vrms\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXLR output impedance: 200 Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRCA output impedance: 100 Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXLR THD+N: 0.00006% (-124 dB), unweighted\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRCA THD+N: 0.00008% (-121 dB), unweighted\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXLR dynamic range: 132 dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRCA dynamic range: 126 dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXLR SNR: 132 dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRCA SNR: 126 dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB transmission: Asynchronous\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWindows compatibility: Windows 7, 8, 8.1, 10, and 11, driver required\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMac compatibility: macOS 10.6 or later\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLinux compatibility: Driverless operation supported\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMQA decoding inputs: USB, optical, coaxial\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB and I²S bit depth: 1-bit, 16- to 32-bit\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptical and coaxial bit depth: 1-bit, 16- to 24-bit\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB and I²S PCM sampling rate: 44.1 to 768 kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB and I²S DSD sampling rate: 2.8224 to 22.5792 MHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptical and coaxial PCM sampling rate: 44.1 to 192 kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLDAC: 24-bit\/96 kHz, 990 kbps, 660 kbps, or 330 kbps\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eaptX HD: 24-bit\/48 kHz, 576 kbps\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eaptX: 16-bit\/44.1 kHz, 352 kbps\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSBC: 16-bit\/44.1 kHz, 328 kbps\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAAC: 16-bit\/44.1 kHz, 320 kbps\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOCXO: ±5 ppb, 10 MHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower consumption: Less than 10 W\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStandby power: Less than 0.5 W\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: 10 × 7.44 × 1.81 in (254 × 189 × 46 mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: 4.18 lb (1.9 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eD400 MK2 DAC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRemote control\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SMSL","offers":[{"title":"Black","offer_id":48303310242028,"sku":"APS-1419-1","price":649.0,"currency_code":"USD","in_stock":false},{"title":"Silver","offer_id":48303310274796,"sku":"APS-1419-2","price":649.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/1.1851.png?v=1788455539","url":"https:\/\/apos.audio\/products\/smsl-d400-mk2-high-resolution-usb-desktop-dac","provider":"Apos","version":"1.0","type":"link"}