Sony PHA-1A Portable Hi-Res DAC and Headphone Amplifier (Silver)

Model: PHA-1A UPC: 027242886759 Item: 163637

Product Information

Portable Hi-Res DAC/Headphone Amplifier

Easily connect to your portable digital music device or PC via USB input to enjoy powerful, pintsize Hi-Res audio performance. The PHA-1A can playback Hi-Res music files up to 192kHz/24-bit.


PHA-1A Highlights:

  • Compact and lightweight for easy portability and use
  • Hi-Res audio DAC/amplifier supports up to PCM 192kHz/24 bit
  • Direct Digital Connection for smartphones, DMPs, iOs devices, and PCs
  • Solid Sound: Wolfson DAC w/separate operational & headphone amps
  • Sleek and durable aluminum enclosure


PHA-1A Features:

14x the detail of MP3s

  • The PHA-1A portable headphone DAC/amplifier affords a powerful high-resolution audio experience through your headphones and can decode a variety of Hi-Res PCM audio file formats up to 192kHz/24-bit format.

Multiple connection options

  • Compatible with a wide array of digital devices. The PHA-1A features a standard USB type A connection, ideal for digital interconnectivity to compatible iOs and other devices, while a second microUSB is handy for digital interconnectivity with compatible Walkman or Xperia devices. A third microUSB connector provides for charging the device using a USB AC adaptor (Sold Separately).

High-quality amplification circuits

  • The WM8740 Wolfson DAC samples PCM audio up to 192 kHz/24 bit and the LME49860 operational amp delivers outstanding signal & performance with ultra-low distortion, low noise & high slew rate. A high-bandwidth TPA6120 headphone amp minimizes noise, delivering more than 120 dB of dynamic range to ensure music is heard with every detail.

Super-smooth audio

  • An internal, asynchronous USB 2.0 clock supports the highly accurate conversion of digital signals to analog sound. This precision clock signal generator also reduces timing inaccuracies when converting digital signals into analog waveforms. The result is superior audio performance with minimal noise and distortion.

Built to last

  • A compact aluminum enclosure protects the delicate internal circuitry from outside interference and impacts while alloy bumpers protect the volume knob from external impact.

Rechargeable Lithium-ion battery

  • The internal rechargeable battery provides approximately 6 hours of hi-res music playback when connected digitally via USB input.

Flexible headphone support

  • A two position, side mounted gain switch allows you to optimize amplifier output level to match varying headphone impedances ranging from 8 to 600 Ohm. Select between Low or High settings to maximize your listening experience.



PHA-1A Specifications:

Amplifier Section

  • Impedance : Supported impedance: 8 - 600 Ohm (Normal - High)
  • Amplifier Inputs and Outputs
    • Digital Audio Input(s) : Inputs (2): USB Micro-B input (for PC, Walkman, and Xperia), USB Standard type A (for iPod/iPhone/iPad)


  • Volume Control : Rotary
  • Distortion : 0.01% or less (1 kHz)
  • Sampling Frequency : PCM (PC connection Maximum 192kHz/24-bit)
  • Frequency Response : 10 Hz - 100 kHz


  • Case Type : Aluminum chassis
  • Type of Use : Portable and Home
  • Impedance : Supports: 8 ohms - 600 ohms
  • Power On/Off : Integrated: Rotary power/volume knob

General Specifications

  • Recharging time : Approx. 3.5 hours (Connected to PC) Approx. 2 hours (Via AC-UD10, USB AC Adaptor, sold separately)

Inputs and Outputs

  • Digital Audio Input(s) : Inputs (2): USB Micro-B input (for Computer, Walkman, and Xperia), USB Standard type A (for iPod/iPhone/iPad)
  • DC-In : Inputs (1): USB Micro-B input
  • Output(s) : Output (1): Headphones (stereo mini-jack, only 3-pole supported)


  • Battery Type : Built-in Lithium ion rechargeable battery
  • Power Source : DC 3.7 V: Built-in lithium-ion rechargeable battery DC 5 V: When charging via USB
  • Battery Life (Approx.) : Approx. 6 hours
  • Battery Indicator : Red LED when charging
  • Battery Charging (Approx.) : When connected to computer: Approx. 3.5 hours from empty to full When connected to AC outlet: Approx. 2 hours from empty to full
  • Output Power : Maximum output (when using built-in lithium-ion battery):
    • Approx. 148mW+148mW (8 Ω, 10% distortion)
    • Approx. 80mW + 80mW (32 Ω, 1% distortion)
    • Approx. 26mW+26mW (300 Ω, 10% distortion)

Weights and Measurements

  • Dimensions (Approx.) : 62 mm x 18.5 mm x 1490 mm (2.4" x .73" x .22")
  • Weight (Approx.) : Approx. 5.11 oz. (145 g) - rechargeable battery included