SONY / PHA2

Portable headphone amplifier capable of playing DSD (Direct Stream Digital)

■ Supports digital connection with Walkman, iPhone, iPad, and iPod
・Audio data stored on your Walkman, iPhone, iPad, or iPod (＊2) is transmitted digitally and converted to analog using the unit's high-quality DAC, achieving natural, high-quality sound that is faithful to the original. With Walkman, it supports 192kHz/24bit PCM audio sources. High-quality content is reproduced to the fullest.
■ Supports USB audio
・Supports 192kHz/24bit PCM audio sources and 2.8/5.6MHz DSD format (＊). Asynchronous transmission ensures high-quality content is reproduced to the fullest.
■ Thoroughly Enhanced Analog Circuit Sound Quality
・By using high-quality audio-specific components such as 35μm thick copper foil printed circuit boards and film capacitors in the audio circuits, this portable amplifier delivers exceptional sound quality. Furthermore, a layout that separates the analog and digital circuits reduces unnecessary internal electrical noise caused by interference, resulting in clear music playback.
■ Two Dedicated Master Clocks
- Two internal clock oscillators (22.5792MHz, 24.576MHz) switch between 44.1k, 88.2k, and 176.4k, and 48k, 96k, and 192k. By perfectly synchronizing and demodulating both signals, ideal analog conversion is achieved.
■ High-Quality Line-Out Operational Amplifier (LME49860)
- The line-out amplifier uses the Texas Instruments LME49860, a high-quality, low-noise, low-distortion operational amplifier. It outputs the output from the high-quality DAC at 2Vrms.
■ High-Quality DAC (PCM1795)
- The DAC uses the Texas Instruments PCM1795, which is used in high-end desktop amplifiers. It supports high-resolution audio files such as PCM up to 192/24-bit and DSD sampling at 2.6MHz and 5.6MHz.
■ Equipped with a high-quality headphone amplifier (TPA6120)
- The output stage uses the Texas Instruments TPA6120, a high-end current-feedback headphone amplifier IC. The OCL output stage uses a dual positive/negative power supply, enabling high-quality, powerful driving of headphones.
■ Line-out function
- The unit's high-quality D/A conversion output can be connected to an external device and used as a D/A converter. A variety of high-resolution sound sources can be played on your audio equipment.

■ Portable headphone amplifier
■ Decoder: USB audio, iPod/iPhone/iPad/Walkman
■ Frequency response: 10 Hz to 100 kHz (AUDIO IN input)
■ Maximum output: Approx. 165mW + 165mW (8 Ω, 10% distortion) *1
■ Audio output terminals: Stereo mini (PHONES x 1, LINE OUT x 1)
■ Audio input terminals: USB (Micro B x 1, Mini B x 1, A x 1), Stereo mini (LINE IN x 1)
■ Power source: Built-in lithium-ion rechargeable battery (DC 3.7V)
■ Battery life: Approx. 17 hours (analog connection), Approx. 6.5 hours (digital connection)
■ Charging time: Approx. 7 hours (when using a computer), Approx. 3.5 hours (when using an AC-UD20)
■ Dimensions: Approximately 68mm x 29mm x 140mm (W x H x D)
Weight: Approximately 270g