HIFIMAN at Audio46

Hifiman EF400 Amplifier and DAC (Open Box)


Product SKU: EF400 (110V) OB


Ready TODAY Tomorrow

Order in the next for shipping today Order now for shipping tomorrow

30 day Returns

Sometimes it's not meant to be. Let us know within 30 days.

Open Box ItemLearn more

Guaranteed to work like new

Authorized U.S. Dealer

Having issues after 30 days? Comes with HIFIMAN's 1 year limited warranty

This item is NOT eligible for promotional codes.
You may still redeem Audio46 Rewards .

$529.00 Retail
$359.00 Save $170.00 (32% OFF)

zero units left
Notify me when available

Need help or product is sold out? Call (212) 354-6424, Chat or Email us

Product Details

↓ Details provided by HIFIMAN
(Specifications and appearance of this product are subject to change without notice)

Massive Power and Superior Sound from a Sleek and Stylish Chassis

In 2012, Dr. Fang Bian and his team at HIFIMAN introduced the EF6, the legendary desktop DAC/amplifier that delivers gobs of power for a wide, detailed soundstage.

Ten years later, HIFIMAN is proud to introduce a new model, EF400, that incorporates the best of recently developed technologies, especially the company's advanced HIMALAYA R2R DAC. The EF400 is the modern desktop DAC/Amp solution, with a compact footprint and price to match, but with sonics that outperform products many times its size.

  • Oxygen free copper wire wounded toroidal transformer
  • High current amplifier circuit
  • 30000uf large capacitors

Full Balance

The four-channel differential structure features a DAC, buffer and active filter that add up to unbeatable fully balanced output for stunning performance from a Class AB DAC/amplifier.

The four-channel fully differential amplifier circuit features a maximum output of 10.7 Vrms (THD<1%) on a 36, resistor equivalent load. The result: fully balanced output that is beyond compare.

  • Signal to Noise Ratio : 118+/-3dB (A Weighted)
  • THD+N (Line out) : Between 0.002% and 0.004%
  • Channel Separation : 125+/-3dB
  • Maximum Power Output : 4.4 W per channel
  • Dimensions : 246.5mm(L)×228mm(W)×61mm(H)
  • Weight : 3.08kg

Experience the prized performance of the R2R DAC: a rare treat made possible by HIFIMAN

  • Headphone Out
    • 4.4mm Balanced
    • 6.35mm Single-ended
    • 3.5mm Single-ended
    • XLR 4-Pin Balanced Output
  • 4-level Function Switch: High Gain NOS, High Gain OS, Low Gain OS, Low Gain NOS
  • Volume Control
  • USB Type C
  • USB-B
  • AC Power Connector/Power Switch
  • Line Out
    • RCA (Single-ended)
    • Balanced Output


*The voltage selector is on the bottom of the EF400. Select the appropriate voltage for your country before connecting the power cord.

The value displayed on the red voltage switch is the current voltage: 115V / 230V

Open Boxes at Audio46

Save big on the gear you need with Audio46's open boxes!

Get great discounts on preowned equipment that's just as good as brand new

  • "What is the condition?" It's going to be like-new with no signs of wear unless the title mentions otherwise
  • "Does it have any issues?" We never list products that have any compromise on their ability to function on par with a brand new item
  • "Were repairs done on it?" We don't do repairs at our store; we send lemons back to the manufacturer
  • "What is its history?" Open Box units could be: a customer return, a review unit, or store demo that has less than 5 hours of use

Our expert team tests and verifies every item to ensure it meets or exceeds your expectations, and with free shippingno restocking fees, and 30 day returns, purchasing open box audio gear from us is a risk-free way to save. Try Audio46 today and experience the difference.

Product Reviews


Your cart