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HiFiMan HM901s Digital Audio Player

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HiFiMan HM901S portable media player with switchable headphone and earphone modes so you can choose how you listen.

Now available in 2 versions - Balanced Amp Card and Gold Minibox Amp Card. The HM901s NO LONGER comes with the standard amp card!

Main Features:

  • Includes DAC ES9018 for upgraded performance
  • Replaceable amp card design
  • Dual-battery solution for reduced noise interference
  • Step potentiometer volume control
  • Adaptive to both balanced and single-ended outputs
  • Sleek new look
  • TAICHI II for most intuitive user interface
  • 3 second power on / off
  • Decodes 24-bit 192kHz high definition music files
  • Offers upsampling to 24/192
  • Supports DSD 2.8MHZ
  • 9 hour battery life

Supports Multiple Audio Formats

The HM901s decodes 24-bit 192kHz high definition music files and offers upsampling to 24/194.


DAC ES9018 for best sound experience

The ES9018 is currently the most expensive DAC chip available. HiFiMan's design team refined this DAC chip by adding an extra oscillator for upgraded performance. The result creates an all new reference among portable and mobile high-res players.

The ES9018 also achieves a wider sound stage with enhance separation.

Optimized Analog Circuit

The HM901s brings balanced, high quality reproduction of live music to your ears.

  • Get excellent sound with the OPA2107
  • Two filter response curves, vintage and HD, give you two different sound experiences
  • Switch between high & low gain modes for headphones and earphones
  • Replaceable card design

Dual-Voltage Doubly Divine Sound

The dual-battery solution of the HM901s provides enhanced performance delivering +/- 7.4 volts, 2,000mA. This reduces the power-supply noise and allows you to enjoy more of your music.

Advanced Step Potentiometer

The patented step analog volume control is designed for precise control and accurate channel balance. The step potentiometer removes the carbon film that tends to easily wear out. The resistors in both channels of the step potentiometer can be paired to make sure they are 100% identical. No-gain control circuit delivers performance unmatched by the digital volume chip.

Digital volume control chips with no abatement from digital high frequency noise can result in poor sound quality.

HM901s is compatible to most earphones and heapdhones in the market by simply changing the amp module.

Balanced Output for Perfected Sound Experience

The HM901s brings balanced, high quality music reproduction creating joy for your ears. Designed to be adaptive for both balanced and single-ended output, HM901s offers wider balanced output signals with even more powerful resistance to interference. The soundstage and separation are largely improved.

Replaceable Amp Card Design

HiFiMan uses an open interface for headphone amplifiers to allow for more compatible designs and a chance for third-party designers to collaborate with HiFiMan.

New Look

  • Aluminum alloy modeled and crafted for higher precision and durability.
  • Exceptionally durable anti-glare screen.
  • Processed surface quality of the sapphire substrate for scratch resistance.
  • Newly optimized design with increased shock proof intensity.


This newly improved system is the most intuitive user interface possible. Features only a 3 second power on / off ability.

DAC Chip:



OPA627*2, OPA2107*2

Frequency response:



0.008% (Line out)



SD card memory:

up to 256GB

Battery life:

9 hours

Supported music formats:


4.0 / 5.0
1 Review
5 Stars
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1 Star
Musical Eargasm!
First off, props do Drew and his crew for the excellent service and care. (the speed at which these guys/ladies operate and ship orders is second to none).

I have listened to various iPhones, 4 and 6, as well as, in recent times, an Astell and Kern AK100 MK2, an iBasso DX90, all in naked form and amped up to various portable amps such as the ALO Audio RX MK2, TTVJ Slim, Fiio Montblanc and Vorzuge Vorzamp Pure 2 plus. So my review will be coming from that perspective. As for headphones, I have tried this DAP with the Ultrasone Edition 8, Ultrasone Signature Pros and the Shure SE535's.

First off, straight out of the box I could already discern a beefier sound when compared to say, the DX90 and iPhones, though the iPhone/ iPod has a sound charm of its own (another discussion). The DX90, though heavily detailed, sounded as though it lacked some soul which the HM901S clearly had. But it was only when I tweaked some of the settings in the UI and plugged into the Balanced output did the sound signature suddenly go from highly polished to something magical.

It was as though the musicality suddenly appeared and tickled a nerve in the pit of my stomach.

The best way I can describe it is that its kind of like "Worcestershire Sauce." You can't quite put your fingers on what the secret ingredient/s are but you know its there, and its tasty. I wouldn't say its neutral, or warm, or analytical or even coloured.. It might be a little of each, or none at all. In all it is a lot of fun and I'm only 40 minutes in lol... Just my opinion.
June 24, 2015
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