HiFiMAN EF400 DAC/Amplifier, Wired

HiFiMAN EF400 DAC/Amplifier (Wired)

Turn your headphones into a concert hall with discrete R2R magic and real-world power

If you crave the organic tone of vinyl with the precision of modern digital, the EF400 is the desktop hub that makes music feel alive again. HiFiMAN’s proprietary HIMALAYA discrete R2R DAC architecture delivers richly textured timbre, while the built‑in fully balanced headphone amp provides the muscle and control planar headphones demand—all in a single, elegantly compact chassis. Four front‑panel headphone outputs, OS/NOS voicing at the twist of a knob, and plug‑and‑play USB make it effortless to sit down, press play, and disappear into your library.

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Why Audiophiles Choose This Product

• Strong, lifelike sound
  • HIMALAYA discrete R2R DAC serves up natural, “analog‑like” tone with excellent dynamic swing, paired to a powerful balanced amplifier that drives demanding planars with confidence. Max output is rated at 4.4 W per channel.
• Engineering that matters
  • Discrete resistor‑ladder conversion guided by a custom FPGA, selectable Oversampling (OS) or Non‑Oversampling (NOS), and a four‑level gain/voicing switch let you tailor the presentation to your headphones and recordings.
• Everyday usability
  • Two USB inputs (USB‑B and USB‑C) for flexible desktop setups, plus plug‑and‑play on macOS and Windows 10+. The rear‑panel 115/230V selector makes it travel‑ready for different regions.
• Broad, practical connectivity
  • Four headphone jacks up front—3.5 mm and 6.35 mm single‑ended, 4.4 mm balanced, and 4‑pin XLR balanced—plus balanced XLR and RCA line outputs in back for speakers or external amps.
• A distinct value proposition
  • Few single‑box DAC/amps combine discrete R2R conversion, genuinely high power, and this breadth of balanced I/O at the EF400’s footprint. It’s a rare, long‑term anchor for an evolving headphone system.

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What’s Included

• Main unit: HiFiMAN EF400 Balanced Desktop DAC/Headphone Amplifier (HIMALAYA R2R DAC; OS/NOS voicing; four front‑panel headphone outputs)
• Primary accessory: AC power cable (IEC)
• Documentation: Owner’s Guide; downloadable USB driver for legacy Windows if needed (via HiFiMAN support site)

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Technical Specifications

Specification	Value	Notes
Product Type	Wired desktop balanced DAC/headphone amplifier	USB‑B and USB‑C digital inputs; no wireless features.
DAC topology	HIMALAYA discrete R2R (ladder)	Natural timbre and OS/NOS voicing options.
Gain/Voicing	4 modes: High‑Gain NOS, High‑Gain OS, Low‑Gain OS, Low‑Gain NOS	Quick tuning for headphone sensitivity and preferred sound.
Headphone outputs	3.5 mm SE, 6.35 mm SE, 4.4 mm balanced, 4‑pin XLR balanced	Versatility for IEMs to full‑size planars.
Line outputs	XLR (balanced L/R), RCA (single‑ended)	Feed powered speakers or an external amp.
Max output power	4.4 W per channel	Drives most low‑efficiency planars with headroom.
SNR	118 ±3 dB (A‑weighted)	Low noise floor for black‑background listening.
THD+N (line out)	0.002–0.004%	Clean conversion and amplification.
Channel separation	125 ±3 dB	Wide, stable stereo image.
Inputs	USB‑B, USB‑C	Plug‑and‑play on macOS/Windows 10+. Driver for older Windows.
Mains voltage	115/230 V switchable (bottom panel)	World‑ready power selection.
Dimensions	246.5 × 228 × 61 mm	Compact, low‑profile desktop footprint.
Weight	3,080 g	Solid build quality for vibration control.
Output impedance (balanced hp out)	Approx. 9.6 Ω (measured)	Best synergy with planars and many over‑ear dynamics; use Low‑Gain for sensitive IEMs.

Practical pairing notes:

• HiFiMAN recommends using the 3.5 mm and 4.4 mm outputs in Low‑Gain for high‑sensitivity IEMs; the 6.35 mm and 4‑pin XLR suit lower‑sensitivity headphones.

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Professional Recognition

• Reviews
  • “The EF400 has unique attributes that are hard to find in a single package… high output power coupled with the R2R DAC is a rarity.” — Headphonesty.
  • “This is an analogue sounding DAC with the most natural timbre and an organic texture.” — Head‑Fi community review.
  • Headphones.com’s full measurement suite documents output impedance and performance characteristics; best objective results were in Low‑Gain OS mode.
• Heritage
  • HiFiMAN was founded by Dr. Fang Bian and is renowned for planar‑magnetic headphones and desktop amplification, bringing decades of R&D to the EF-series.
• Innovation
  • HIMALAYA is HiFiMAN’s in‑house, discrete R2R DAC module guided by a custom FPGA algorithm to optimize noise, distortion, and efficiency for high‑performance audio.

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The Bottom Line

EF400 is for listeners who want more music in their music—tone, texture, and drive—without juggling multiple boxes. Its discrete R2R conversion, real‑world power, and unusually complete I/O make it a standout one‑box upgrade for serious headphone rigs and streamlined desktop systems. Choose OS or NOS, pick the output that suits your cans, and enjoy a sound that is engaging, resolving, and built for long sessions.

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Notes for system matching and setup:

• macOS and Windows 10+ connect driver‑free via USB; HiFiMAN provides a legacy Windows driver via its support page. Always set the bottom‑panel selector to your local mains voltage before powering on.
• Given the measured output impedance, low‑impedance, multi‑driver IEMs may exhibit audible interaction; use Low‑Gain and consider the 3.5 mm output for best control. Planar over‑ears from HiFiMAN and others are an excellent match.

This description is based on the official owner’s guide and product page, cross‑checked with independent measurements and reviews to ensure accurate specs and credible, real‑world guidance.