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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

    Little wonder


    I choose this headphones amp just because I trust A-T. I already got ATH-MSR7NC headphones so I would like to deepen the sound experience. Both headphones and amp were blind bought, in this case 'deaf'. And I never was disappointed. The quality and the sound are mine, what I always wanted. The sound is astonishing, though it is my first Hi-Res experience. I am very happy with it. Period. I am never 100% satisfied and insatiable in wishing to improve things, so it looks like there more cons than pros. No way. I am happy yet it could be a bit better. The volume knob is very smooth in rotating though some anti-slip finishing would be a plus. Three little switchers could be better fixed but they are too loose to my taste. Pity there are no nice whole cable to pair iPhone to AT-PHA100, I had to buy a thick and stiff Apple usb3 lightning adapter. Unfortunately the pair micro-USB OTG > short USB Lightning cable do not work. Since I have no more iPhone 5 but a brand new X, nice silicone bands and pad neither can be used.

    Currently Moscow, Russia


    AT-PHA100 Portable Headphone Amplifier

    4.0 1


  • Q & A

    Can I use the Audio-Technica ATH R70x on this amp


    Thank you for your inquiry. Yeas you can.


    How to Connect with iphone


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


    Where can I find the driver for win 10


    Thank you for your inquiry. Here is a link to the drivers:


    can i use this product with noise cancelling headphones




    Will this amplify ipad volume while watching movies?


    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.


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


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

    Red John

    Thank you for your inquiry. The AT-PHA100 requires Mac OSX Mavericks (10.9 or higher).


    When it will be avaibale in the US? Do you have an estimate cost and launch date?


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