Full Specifications & Features


Size & Weight

Approx. 290g

General Features

Impedance (Ohm)
8ohms - 600ohms
Frequency Response
10 - 100kHz(analog section)
Volume Control
Usage Time
Approx 5hours (when digital/baranced)

Portable Headphone Amplifier

Charging indicator
Approx. 8hours(when connected to a computer), approx. 5hours(when connected to an AC outlet using the recommended USB AC adaptor(5V,at least 1.5A))


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Direct Stream Digital (DSD) playback for High-Resolution Audio 

Enjoy studio-quality sound, thanks to the Direct Stream Digital (DSD) audio codec — designed specifically for High-Resolution Audio. This 1-bit format utilises a stream of very high frequency 1s and 0s to recreate audio waveforms at a higher resolution than conventional codecs. The result is clearer, crisper, High-Resolution Audio quality.

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Balanced audio cuts cross-talk

With a supplied balanced 4-wire connection and silver-copper dual cord, audio channel separation is improved for better sound. Unlike conventional headphone cords, which share a ground wire, this cord includes left, right and independent ground wires for both channels, so you hear less distortion and cross-talk. 

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PCM support for pure quality

Get close to the original source. PCM (Pulse Code Modulation) handles up to 192kHz/32bit for a sampling rate and bit depth capable of reproducing wave characteristics that are very close to the original analogue wave. In addition to providing clear reproduction of high frequencies, PCM also enables subtle nuances and resonance to be expressed with high fidelity.

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High-Resolution Audio for uncompromised sound

Experience digital music to the fullest with High-Resolution Audio. By capturing music at a higher rate than CD, increasing both audio samples per second and the bit-rate accuracy of each sample, High-Resolution Audio offers an uncompromised rendition of an artist’s music. Savour every breath and subtle movement for a truly emotional experience.

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Clock generator for high quality playback

For high quality sound without compromise. Our built-in high precision clock generator reduces vibrations and jitters, improving conversion accuracy and overall audio stability.

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Volume control

A high quality volume dial regulates how voltage is delivered to the headphones. Low resistance ensures there is little signal lost, allowing you to precisely control the volume, for comfortable listening. 

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Control input signal with gain

Gain is the maximum amount an amplifier can increase a signal. Too little gain and your headphones might not play loud enough. Too much gain, and you will be forced to use only a small portion of the volume control’s range.

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Portable, lightweight design with durableness

Small and light at about 290 grams the PHA-2A has a rugged aluminium case to protect it from everyday knocks and shocks. Rounded edges make it easy to hold when out and about. Comes with a silicone band for comfortable carrying along with your Walkman, Xperia or iPhone.

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Improved battery life for longer listening

Never run out of power when you’re on the move. The PHA-2A holds enough charge for up to 5 hours of playing, so you don’t have to worry about finding a charger when you’re out and about.

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Superior sound with a dedicated USB DAC amp

With a dedicated USB DAC amp connecting your headphones and compatible PC, smartphone or Walkman®, you’ll’ enjoy higher quality streaming of High-Resolution Audio. The amp takes over responsibility from your portable device for processing and converting digital data, then amplifies sound using its own integrated amplifier.