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HiFiMAN RE400 Manual

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1642-hifiman-re400-manual page 1
Thank you for purchasing the HFIMAN RE400, a high performance,
in-ear headphone designed to provide excellent sound quality and
comfort while on the go. Years of painstaking research went into
the design and engineering of your RE400 to provide you with
many hours of trouble-free enjoyment. HFIMAN is one of the
leading brands of high quality headphones, amplifiers and portable
music players in the world.
Product Overview
The RE400 can be used with most portable music devices
(such as an iPod or smartphone) by using the standard mini-stereo
plug. It can also be used in hifi systems by using the adapter,
which can quickly convert the plug into a standard ¼” headphone
jack. The multiple flanges supplied help provide exceptional comfort
even when listening for extended periods.
Care and Maintenence
Following a few simple tips can add to your listening enjoyment
and lifespan of your earphones.
• When not in use, we recommend keeping your RE400 earphones
in the supplied pouch.
• Never remove the earphones by pulling on the cable. This may
cause damage to the cable and is not covered by warranty.
• Avoid hard impacts to your earphones or extreme temperatures.
• Titanium-Coated 8.5mm drivers custom designed by HIFIMAN
• Compact size utilizing powerful Neodymium magnets
• Oxygen-Free Copper Cabling
• Advanced ergonomics for comfort and extended listening
• Stylish design and light weight
• 3.5mm mini plug
• Mini adapter for regular earphone jack
• Frequency Response: 15Hz-22kHz
• Impedance: 32 Ω
• Sensitivity: 102 dB
• Rated: 10mW
• Weight: 0.45 oz (12.9g)
Package Contents
(4) Silicone Tips
(1) Pair Bi-flange (small)
(1) Pair Bi-flange (large)
(1) Pair Mono-flange (small)
(10) Filters
(1) Earphone Carry Pouch
How To Wear
Caution
• Please do not wear earphones while operating any type of vehicle.
• Use caution when using earphones while walking, jogging, cycling
• Listening at sustained high volumes may cause permament
damage to your hearing. Always listen at a lower volume.
RE400 Care and Maintenance
fig.2 - Over the Ear
fig.1 - Normal
Before using your earphones, make
sure the volume is down on your
device. There will be a small
(R) and (L) on the black stress relief
of the earphones denoting right and
left.
Place earphone in your canal and
using a gentle twisting motion push
into your ear canal until you get a
secure fit. The cable should exit
straight down (fig.1).You may have
to try different size ear tips to get the
correct fit and level of comfort.
If you desire to wear the cable in the
“over the ear” style (fig.2), follow the
steps above, but the cable should
exit to the top at a slight angle.
You may need to adjust the angle
to get the right level of comfort and
secure fit.
Features and Specications

Ask a Question

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Do you recommend RE400?

Frequently Asked Questions

A

The RE400 works with most portable music players and smartphones via its 3.5mm mini-stereo plug. A 1/4" adapter is included for use with home hi-fi gear and headphone amplifiers.

Is this answer helpful?

A

Try the supplied silicone tips (mono- and bi-flange, various sizes) to find the best seal. Insert with a gentle twist until secure; experiment with straight-down and over-ear cable routing to minimize movement and improve comfort and bass response.

Is this answer helpful?

A

Store the RE400 in the provided pouch when not in use, avoid pulling on the cable to remove them, and protect them from hard impacts and extreme temperatures. Replace or clean filters/tips periodically to maintain hygiene and sound quality.

Is this answer helpful?

A

HiFiMAN provides a one-year limited warranty against manufacturing defects. To request service, contact customer support for an RA#, include a purchase receipt and a detailed problem description, and ship the unit to the specified service address (owner pays return shipping to HiFiMAN).

Is this answer helpful?

A

They are lightweight and can be worn over the ear for a more secure fit, making them suitable for commuting and light activity. However, exercise with caution; they are not specifically marketed as sport earphones and cable handling should be careful to avoid damage.

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A

No. The RE400 is a wired, audio-focused in-ear monitor without an inline microphone or remote; it prioritizes sound quality over hands-free phone features.

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A

Expect a balanced presentation with clear mids and defined highs thanks to the titanium-coated drivers. Bass is present but not overemphasized, making these earphones well-suited for detailed listening across many genres rather than heavy sub-bass reproduction.

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Advantages and Disadvantages

Advantages

  • Detailed mids and clear highs from titanium-coated 8.5mm drivers.
  • Lightweight, ergonomic design with multiple tip options for extended comfort.
  • Includes 3.5mm plug plus 1/4" adapter for portable and hi-fi use.
  • Oxygen-free copper cable for reduced signal loss and better fidelity.
  • Compact package with carry pouch, filters, and varied tips for customization.
VS

Disadvantages

  • Bass may be limited for listeners seeking strong low-end emphasis.
  • Wired connection lacks modern wireless convenience.
  • Durability depends on careful cable handling; warranty excludes misuse.
  • No inline remote or microphone included for phone use.
  • Filters and small parts may be easy to misplace over time.

Product Description

HiFiMAN RE400 — Compact, Detailed In-Ear Monitors

The HiFiMAN RE400 offers a compact, stylish in-ear experience tuned for clarity and comfort. Built around titanium-coated 8.5mm drivers and powerful neodymium magnets, the RE400 delivers a balanced frequency response (15Hz–22kHz) with good sensitivity (102 dB) and a 32 Ω impedance that works well with most portable players and smartphones. Its oxygen-free copper cabling and lightweight construction (0.45 oz / 12.9 g) make it an attractive choice for daily listening and commuting.

Design and Comfort

Ergonomics are a clear focus: multiple silicone tips (including bi-flange and mono-flange options) allow users to tailor the seal and comfort for extended listening sessions. The cable can be worn straight down or over-the-ear for added stability during activity. The included carry pouch and durable mini-stereo 3.5mm plug (with 1/4" adapter) make the RE400 versatile for portable use or connection to home hi-fi systems.

Sound Character and Performance

With titanium-coated drivers and neodymium magnets, the RE400 emphasizes detailed mids and clear highs while maintaining a usable bass presence for everyday listening. The 15Hz–22kHz response ensures full-range coverage suitable for many genres. Rated at 10 mW, these earphones are efficient enough to perform well with smartphones and dedicated portable players.

Practical Features and Accessories

The package includes multiple ear tip sizes and styles, 10 filters, and a compact carry pouch, allowing long-term maintenance and customization. The oxygen-free copper cable aims to reduce signal loss and preserve fidelity. A standard mini plug and included adapter provide immediate compatibility with most audio sources.

Care, Usage, and Warranty

Simple care extends lifespan: store the earphones in the pouch, avoid pulling the cable to remove them, and protect them from strong impacts and extreme temperatures. The RE400 comes with a one-year limited warranty covering manufacturing defects; warranty repairs require contacting customer service for an RA# and returning the unit with proof of purchase.

Notes

  • Listen at moderate volumes to avoid hearing damage.
  • Try different tip sizes for optimal seal and bass response.
  • Use the over-ear fit for active movement to reduce cable noise.

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