HIFIMAN EF400: a desktop R2R DAC and headphone amp built around HIFIMAN's in-house Himalaya R2R module, rated at up to 4.4W per channel, with four headphone jacks including 4-pin XLR and a front switch for gain and NOS/OS. Made for computer-fed desks driving power-hungry planar headphones.
Who the HIFIMAN EF400 is for
Hungry planars and low-sensitivity headphones: HIFIMAN rates the amp at up to 4.4W per channel and earmarks the 6.35mm and 4-pin XLR jacks for low-sensitivity headphones.
Balanced-cable owners: The front panel takes almost any cable: 4-pin XLR and 4.4mm balanced, plus 6.35mm and 3.5mm single-ended.
Computer or phone as the source: USB-B and USB-C inputs connect a computer, tablet or phone, and macOS or Windows 10 and later need no driver.
NOS/OS experimenters: A four-position front switch sets gain and filter mode together: High Gain NOS, High Gain OS, Low Gain OS or Low Gain NOS.
Skip it if: you need to connect a TV, console or CD transport: USB-B and USB-C are its only inputs, with no optical, coaxial or Bluetooth, and the 3.08kg chassis runs on AC mains.
HIFIMAN EF400 key specs
DAC: HIFIMAN Himalaya discrete R2R (FPGA-based)
Output power: Up to 4.4W per channel (maximum)
Headphone outputs: 6.35mm and 3.5mm single-ended; 4.4mm and 4-pin XLR balanced
Line outputs: XLR balanced, RCA
Inputs: USB-C, USB-B
Modes: High/Low gain with NOS or OS (4-position switch)
SNR: 118 ±3dB (A-weighted)
THD+N (line out): 0.002%–0.004%
Power: AC mains, 115V/230V selector
Size and weight: 246.5 × 228 × 61mm; 3.08kg
Genuine HIFIMAN stock, 1-year warranty.
HIFIMAN EF400 vs similar options
vs FiiO K13 R2R: Also R2R with NOS/OS, but adds optical, coaxial and LDAC Bluetooth inputs, a remote and 10-band PEQ, rated 2,400mW per channel at 32Ω; pick the EF400 for a 4-pin XLR headphone jack.
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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