HIFIMAN HM901U - High Resolution Portable Music Player with Musical Amp Card

HIFIMAN HM901U - High Resolution Portable Music Player with Musical Amp Card

HIFIMAN HM901U - High Resolution Portable Music Player with Musical Amp Card

HIFIMAN HM901U - High Resolution Portable Music Player with Musical Amp Card

HIFIMAN HM901U - High Resolution Portable Music Player with Musical Amp Card

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Expected availability: 7-14 business days 

Product Highlights

  • 2x ES9018 DAC Chips
  • 2x OPA627 and 2x OPA2107 Op-Amps
  • Frequency Range: 20 Hz to 20 kHz
  • Dual Voltage Battery Reduces Noise
  • 9 Hour Battery Life
  • SD Card: Supports Up to 256GB
  • Advanced Step Analog Volume Control
  • Modular Headphone Amplifier Card Slot
  • Includes Musical Amp Card Pre-Installed
  • Includes Charger, USB, and RCA Cables
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  • 1Description

The HM901U from HIFIMAN is a reference-level portable music player that ships with the Musical Amp card and features a number of enhancements resulting in mastering-quality sound for audio engineers, audiophiles, and serious audio enthusiasts. The unit offers up to 256GB of storage via SD card memory and supports multiple music formats including MP3, AAC, WMA, OGG, APE, WAV, FLAC, AIFF, ALAC (M4A), and DSD (DFF).

The HM901U utilizes a pair of ES9018 DAC chips to achieve a wide sound stage and extremely high-detail separation. The analog circuit design utilizes two OPA627 and two OPA2107 op-amps that have been integrated into a highly optimized custom circuit specifically designed for the ES9018 DACs. The dual-voltage battery runs for up to 9 hours and delivers ±7.4V, 2000mA of power, which helps eliminate noise from the power supply and allows you to focus on your music without distractions. An advanced and patented step analog volume control offers precise and accurate channel balance at all levels, particularly at lower volumes, which accommodates highly sensitive in-ear monitors.

The HM901U features a modular approach to headphone amplification by utilizing a user-replaceable slot for amplifier cards. With so many different styles of headphones available, it proved difficult to optimize only one amplifier. The card slot allows the user to integrate the amplifier of their choice, which best complements their style of headphone. The included Musical Amp card uses discrete components that are designed to reveal a mellow and silky vacuum-tube style that excels at classical music, vocals, and jazz performances. The CNC machined enclosure is designed to prevent system crashes due to temperature issues and other disturbances. The HM901U ships with the dual-battery module, a USB cable, an RCA cable, a charger, and the pre-installed Musical Amp card.

The HM901U utilizes a pair of ESS Technology ES9018 DAC chips, one for each channel. The result is a warm and neutral sound, emphasizing mid-range reproduction, largely improving upon the dry, cold, and analytical nature commonly found with other implementations using a single ES9018 chips. Using a pair of ES9018 chips achieves a wider sound stage, while realizing extremely high-detail separation
Optimized Analog Circuit Design
Using two OPA627 and two OPA2107 op-amps, the HM901U brings balanced, high-quality live-music reproduction straight to the listener. Additionally, the HM901U uses a highly optimized, custom circuit design for the ES9018. The switchable high and low gain modes allow for better optimization depending on the headphone and earphone loads
Dual-Voltage Design
The HM901U utilizes a dual-voltage solution, delivering ±7.4 V and 2000 mA, which results in substantially lower noise from the power supply, allowing you to focus on your music without distractions. No coupling capacitors results in a wider frequency response to accurately reproduce live concert recordings. Moreover, the MH901U relies on a unique relay design to further improve the sound quality
Advanced Step Potentiometer
The patented step analog volume control is designed for precise control and accurate channel balance (with less than 0.001 in errors). The resistors in both the channels of the step potentiometer are painstakingly paired to ensure that they are functionally identical. This results in an excellent channel balance and sound stage. Furthermore, in order to drive earphones of high sensitivity, the HIFIMAN's advanced step potentiometer has a better and smarter gradual attenuation design, particularly at low volumes. This helps avoid inconsistent volume levels and channel imbalance when increasing or decreasing the volume
Modular Amplifier Card Options
The HM901U features a user-replaceable slot for amplifier cards. As a result, it is now possible to use different cards to best fit the specific requirements of each headphone/earphone. The HM901U offers true balanced output capability, increasing resistance to interference, widening the soundstage, and improving detail and separation. The selection for amplifier cards includes an option for sensitive in-ear monitors, and a MINIBOX and MINIBOX Gold card specifically designed for over-the-ear headphones. The balanced card is designed for headphones with a balanced termination, often indicated with a 4-pin XLR connector
Fully Discrete Musical Amp Card Included
The HM901U ships with the Musical Amp Card, the first optimized discrete component designed for a portable music player. The discrete amp card has the advantage of breaking free from the limits of an op-amp design to feature a better listening experience and higher-end performance. The HIFMAN engineering team has achieved very fine tuning based on a long-term, wide-ranging, and tedious trial and adjustment period. The resulting Music Amp Card reveals a mellow and silky vacuum-tube style. Not only does it provide solid ground for classical music, but it also renders vocals, jazz, and small chamber orchestra even more pleasant to your ears
Advanced Craftsmanship
The HM901U's CNC alloy casing combines sleekness and high durability. It helps prevent system crashes due to temperature issues and other disturbances, resulting in a largely improved system stability
UPC: 703510596376
In the Box
HIFIMAN HM901U - High Resolution Portable Music Player with Musical Amp Card
  • Battery
  • USB Cable
  • RCA Cable
  • Power Cable
  • Amp Card (Pre-Installed)
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description
    Media Player
    DAC 2x ES9018
    Op Amp 2x OPA627
    2x OPA2107
    Frequency Response 20 Hz to 20 kHz
    THD Line Out: 0.008%
    Signal to Noise Ratio (SNR) 106 dB
    Memory Card Compatibility SD Card Memory: Up to 256 GB
    Battery Life 9 hours
    Supported File Formats MP3, AAC, WMA, OGG, APE, WAV, FLAC, AIFF, ALAC(M4A), DSD(DFF)
    Output Card
    Power Output 90 mW
    THD <0.03%
    Frequency Response 20 Hz to 20 kHz (±3 dB)
    Separation 96 dB
    Signal to Noise Ratio (SNR) 104 dB (A-weighted)
    General Specifications
    Dimensions (L x W x D) 4.6 x 2.8 x 1.1" / 117.0 x 72.0 x 27.0 mm
    Weight 7.1 oz / 200.0 g
    Packaging Info
    Package Weight 2.9 lb
    Box Dimensions (LxWxH) 9.9 x 8.0 x 4.6"

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