HIFIMAN HM901 + Grado RS1E

Hi-Fi Portable Music Player w/ Standard Amp Card and Reference Series Wired On-Ear Open Back Headphones

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High Fidelity Portable Music Player w/ Standard Amp Card
Quantity: 1

General Features:

  • State of the art portable audiophile-grade music player
  • Unrivaled sound reproduction thanks to two internal ES9018 32 bit DAC chips
    • Each chip converts digital signals to analog signals for each channel
  • Intuitive on-board controls and user interface
  • Balanced output earphone jack
  • Comes with standard amplifier card
  • Expandable via multiple amp cards including:
    • Balanced card
    • IEM card
    • Minibox card
  • Amplifier cards offer different listening experiences catered to meet different sound preferences
  • Compatible Music Formats:
    • 24 bit: WAV, FLAC, ALAC (MP4)
    • 16 bit: AIFF, AAC, APE (16bit/44.1 KHz & 48 KHz)
  • Frequency Response: 20-20,000 Hz
  • Signal-to-Noise Ratio: 106dB
  • Distortion: 0.008%
  • High quality full color LCD display
  • Memory: Supports up to 128GB SD card
  • Replaceable rechargeable Lithium ion battery
  • Battery Life: Up to 9 Hours
  • Dimensions: 2.83"W x 4.6"H x 1.14"D
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

What's in the Box?

  • HIFIMAN HM-901 High Fidelity Portable Music Player
  • Standard Amplifier Card
  • USB Cable
  • S/P DIF Input/RCA Line Out Cable
  • Charging Cable
  • User Guide

Is this the Player for You?

Check out the HIFIMAN HM-901 User Manual

Note: HiFiMAN products can only be shipped to customers in the United States

Also found as: HM901

Grado RS 1e

Reference Series Wired On-Ear Open Back Headphones w/ Large Mahogany Wood Enclosures
Quantity: 1

General Features:

  • Wired Reference Series On-Ear Headphones
  • Handcrafted mahogany earpieces
    • Intricate curing process optimizes the tonal quality
  • Oversized wooden air chambers deliver outstanding sound quality while minimizing distortion and coloration
  • Specially designed vented diaphragms provide a natural sound and extended bass response
  • Drivers precisely matched to within 0.05dB for improved stereo imaging
  • Ultra-High Purity Long-Crystal Copper voice coil wire
  • Adjustable leather headband for comfortable listening sessions
  • Primary Color: Mahogany
  • Accent Colors: Black
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product Specifications:

  • Driver Size: 50mm
  • Frequency Response: 12-30,000 Hz
  • Sensitivity: 99.8dB
  • Nominal Impedance: 32 Ohms
  • Ultra High Purity 8-Conductor Cable:
    • Detachable: No
    • 15' extension cable included
  • Plug Size: 3.5mm
  • 1/4" plug adapter included

What's in the Box?

  • Grado RS 1e Headphones
  • 15' Extension Cable
  • 1/4" Adapter Plug
  • Grado Story Sheet
  • User Guide

General Features

Primary Color
This is the main color of the item.
Bluetooth Connectivity
Bluetooth® technology allows two or more electronic devices to communicate with each other wirelessly, such as using your cell phones "hands-free" or transmitting music to Bluetooth enabled receiver. If a unit is Bluetooth capable, it typically can allow you to connect to your Bluetooth cell phone to make and receive calls. Others can access your phone and address book too via Bluetooth. Other Bluetooth capable units offer even more services, such as live traffic information and map upgrades.

More uses of Bluetooth technology include transmitting music to a compatible receiver, printing wirelessly from a computer, and many other wireless uses. Please see the item description for more specific information regarding what features the unit includes.

Built-In Microphone
This will designate if thedevice has a built-in microphone for the recording or transmitting of audio.
Built-In Speakers
This means that the unit comes with speakers already built into the unit.
Does not allow water to pass through the device keeping it dry.


3.5mm Stereo Jack
Uses a 3.5mm stereo jack to connect to an audio source. This is the common size found on most CD and Mp3 players, as well as most home computers.


Power Source
The power source is the method in which the unit receives power. Some units will be powered by batteries, while others will need to be plugged in to an AC or DC power source.
Rechargeable Battery

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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Product Summary


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Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: HIFIMAN HM901 + Grado RS1E

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HIFIMAN HM901 + Grado RS1E

Hi-Fi Portable Music Player w/ Standard Amp Card and Reference Series Wired On-Ear Open Back Headphones


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