The SMSL D400 Pro is a full-size desktop DAC that pairs an AK4191 modulator with an AK4499EX converter and decodes up to 32bit/768kHz PCM and DSD512. USB, optical, coaxial and Bluetooth inputs plus a remote make it a fixed source for listeners building a desktop or rack system around separates.
Who the SMSL D400 Pro is for
Source-first system builders: It's built to be the fixed reference point in a chain rather than part of a plug-and-go dongle setup.
Balanced headphone amp owners: Put it ahead of a balanced headphone amplifier and let the D400 Pro be the fixed source in the system.
Rack and speaker systems: The included remote makes it just as practical parked in a rack feeding a power amp, or driving active monitors.
Multi-source listeners: USB through an XMOS XU316, optical and coaxial inputs plus Bluetooth let several digital and wireless sources share one DAC.
Skip it if: you want a single plug-and-go box; the D400 Pro is a source component meant to feed a separate headphone amp, power amp or active monitors.
vs SMSL VMV D2R: Swaps in ROHM's BD34301EKV converter as part of SMSL's flagship VMV series; pick the D400 Pro if you prefer the AK4191 + AK4499EX split architecture.
vs FiiO Warmer R2R: Takes the R2R route, with a fully balanced architecture and a tube output stage for a warmer presentation; pick the D400 Pro if you'd rather have AK4191 + AK4499EX chip conversion.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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