High-Fidelity Headphone Amplifier OPPO HA-2 SE EU

Nomadic sound at its peak.

Building on the success of the award-winning HA-2 EU portable headphone amplifier, the HA-2 SE EU features the new ESS Technology ES9028-Q2M DAC. With its ESS 32-bit Hyperstream parent architecture and Time Domain Jitter Eliminator, this new reference SABRE32 DAC exceeds all audiophile expectations for musical performance in portable applications. The HA-2 SE EU offers high-performance digital-to-analog conversion for Apple iPhone/iPod devices as well as many Android devices. A 3.5mm input is available for portable music players that do not have a USB digital output. With its VOOC fast charger and powerful battery that can serve as a backup power source for your device, the HA-2 SE EU is a true companion for nomadic music.

Class AB hybrid amplifier

The HA-2 SE EU’s headphone power amplifier circuit is a Class AB design built with integrated circuits (ICs) and discrete transistors. The discrete transistor output stage uses matched and hand-assembled parts. The output transistors are designed to operate in the most linear manner, including on the weakest signals, and deliver their full potential when power is needed.

Technical specifications

Class AB hybrid amplifier
DAC: ESS Sabre32 Reference ES9028-Q2M

Measurements

Frequency response 20 Hz – 200 kHz
Audio input level 1 Vrms
Audio output level 1 Vrms
Maximum headphone output voltage level
- 300 mW into 16 Ohm
- 220 mW into 32 Ohm
- 30 mW into 300 Ohm
Impedance: 0.5 Ohm
Input formats: Stereo PCM, Stereo DSD
PCM sampling frequencies 44.1 kHz - 384 kHz, 16 / 24 / 32 bits
DSD sampling frequency
- 2.8224 MHz (DSD64), 5.6448 MHz (DSD128)
- 11.2896 MHz (DSD256, native mode only)
Profiles: USB 2.0, USB Audio 2.0

Battery

3000 mAh rechargeable lithium polymer battery
Battery usage
- Approx. 13 hours for an analog source via Audio-in
- Approx. 7 hours for a digital source via USB
- Charging time: Approx. 1 hour 30 minutes