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Portable Headphone Amplifier

U.S. One-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.

  • Overview
  • Features
  • Reviews
  • Q & A

  • Overview

    You don’t have to settle for wimpy, muddy sound just because you’re on the go. The AT-PHA100 Portable Headphone Amplifier is small (width and length comparable to a smartphone) but packs a powerful punch. Engineered using select audio components, and enclosed in all-aluminum casing to protect the circuitry, the AT-PHA100 gives headphones a rich, detailed boost throughout the sonic range with ultra-low distortion.

    The AT-PHA100 is equipped with both analog and digital inputs (3.5 mm jack and USB micro-B, respectively) and 3.5 mm headphone jack. It also features a high/low gain switch, machined aluminum volume knob, and five-stage sampling indicator for digital input. The internal lithium polymer rechargeable battery lasts up to 14 hours when amplifying an analog signal, and up to 6 hours when amplifying a digital signal.

    The amplifier comes with two rubber bands and a rubber mat for strapping the unit to a smartphone or other portable device, a 1.0 m USB cable (USB 2.0 to USB micro-B) and a 10 cm audio cable terminating in a 3.5 mm gold-plated stereo mini plug at each end.


    System Requirements: PC: with built-in USB port corresponding to USB 2.0

    CPU: Intel Core2 CPU2.2 GHz or equivalent

    RAM: 32-bit OS 2 GB or more, 64-bit OS 4 GB or more
    Supported OS: Windows XP (32-bit)*, Windows 7, Windows 8, Windows 8.1
    Mac OSX Mavericks (10.9)
    * Technical support by Microsoft is no longer available.

    Corresponding Headphone Impedance: 10 – 300 ohms

    Maximum Output Level: 100 mW + 100 mW (10% during 16 ohms, THD)
    80 mW + 80 mW (10% during 32 ohms, THD)
    10 mW + 10 mW (10% during 300 ohms, THD)

    Frequency Characteristic: 10 Hz – 100 kHz (-1 dB)

    Signal-to-noise Ratio: 110 dB (A-weighted)

    Total Harmonic Distortion: <=0.001% (32 ohms 10mW output)

    Input Connector: Analog: 3.5 mm (1/8") gold-plated stereo mini jack

    Digital: USB (micro-B)/asynchronous mode/
    DSD128 (DoP), DSD64 (Native / DoP): 24 – 32 bit/
    PCM 384kHz, 352.8kHz, 192kHz, 176.4kHz, 96kHz, 88.2kHz, 48kHz, 44.1kHz, 32kHz: 16 – 32 bit

    Output Connector: 3.5 mm (1/8") gold-plated stereo mini jack

    Power Supply: 5V DC, 500 mA bus power system (PC)/rechargeable lithium polymer battery (BATTERY)

    Charging Time: Up to 10 hours (DC5V, 500mA)

    Battery Life: Digital about 6 hours (JEITA) / analog about 14 hours (JEITA)

    Operating Temperature: 41 – 104° F (5° – 40° C)

    Dimensions (excluding protrusions): 1.1" (27 mm) H × 3.0" (77 mm) W × 4.6" (116 mm) D

    Weight: About 240 g

    Accessories Included: 1.0 m USB cable (USB 2.0 to USB micro-B), 10 cm audio cable (3.5 mm gold-plated stereo mini plugs x 2), rubber mat, two rubber bands

    Common spec for analog/digital without annotation
    Fs=384 kHz, 32-bit for digital input

  • Features

    • Specially selected, discrete circuitry enhances the resolution throughout the frequency range

    • NJR MUSES 8832 pre-amp delivers rich, powerful sound from low to high frequencies

    • DAC ESS ES9018K2M circuit samples 384kHz/32-bit PCM, and DSD audio sources at 2.8/5.6MHz

    • Texas Instruments LME49720 op-amp suppresses distortion for crystal clear mid to high frequencies

    • Internal rechargeable lithium polymer battery lasts up to 14 hours

    • High/low gain switch and machined aluminum volume knob

    • Five-stage sampling indicator (for digital signal input)

    • All-aluminum enclosure protects delicate circuitry

    • Includes two rubber bands and a rubber mat for strapping amp to a portable device, a 1.0 m USB cable (USB 2.0 to USB micro-B) and a 10 cm audio cable with 3.5 mm mini plugs

  • Reviews

  • Q & A

    Do you have questions about this product?

    Get answers from real customers and in-house experts with AnswerBox.

    7 Questions | 8 Answers
    Displaying questions 1-7
    • Q:

      Can I use the Audio–Technica ATH R70x on this amp
      Asked on 3/2/2018 by Ollie from FL

      1 answer

      • Staff Reviewer


        Thank you for your inquiry. Yeas you can.

        Answered on 3/13/2018 by AudioSolutionsManager from Audio-Technica U.S., Inc.
    • Q:

      How to Connect with iphone
      Asked on 6/18/2017 by Sam from undisclosed

      1 answer

      • Staff Reviewer


        You may connect the AT-PHA100 to a USB connection. You may use adapters as needed.

        Answered on 6/19/2017 by ATUS_Specialist3
    • Q:

      Where can I find the driver for win 10
      Asked on 10/15/2016 by Dennis from United States

      1 answer

    • Q:

      can i use this product with noise cancelling headphones
      Asked on 5/11/2016 by David

      1 answer

    • Q:

      Will this amplify ipad volume while watching movies?
      Asked on 12/12/2015 by ed from Albany, ny

      2 answers

      • A:

        Not sure about movies as I have not tried it for movies. I just got this amp and I noticed it does increase volume on my Samsung Galaxy Tab S 10.5 android tablet but will not blow out your ears even on highest setting- at least in my ears, however, more more noticeable is that the bass effect really shows itself when unit is switched on and just makes the music have a more "bold" sound to it. Kind of hard to more detail in explaining, I will sum it up like this: volume increase- yes....but volume does not get too crazy ...besides you control volume....biggest plus-music sounds cleaner and crisper and noticed more bass effect than without it. For an approx $40+- amp its a keeper for me. Just do not expect an ultra huge change or effect... at least on my tablet model and make.Important- I do believe this will effect the volume and bass differently on diff makes & models of phones/tablets... I recommend.

        Answered on 12/20/2015 by Rick from Godfrey, IL
      • Staff Reviewer


        You may plug the output of the iPad into the AT-PHA100 headphone amplifier and increase the volume into your connected headphones.

        Answered on 12/13/2015 by ATUS_Specialist3
    • Q:

      Hello, I want to know if AT-PHA100 is compatible with Mac OS X 10.6.8.

      Thank you.
      Asked on 8/16/2015 by Red John

      1 answer

      • Staff Reviewer


        Thank you for your inquiry.

        The AT-PHA100 requires Mac OSX Mavericks (10.9 or higher).

        Answered on 8/17/2015 by AudioSolutionsSpecialist3
    • Q:

      When it will be avaibale in the US?

      Do you have an estimate cost and launch date?
      Asked on 2/5/2015 by Robert1

      1 answer

      • A:

        MSRP will be $499.00 and it should be available April/May

        Answered on 2/11/2015 by AudioSolutionsSpec1 from Stow,OH
    Displaying questions 1-7

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