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OPPO HA-2 is a very mobile-centric portable headphone amplifier and DAC that pairs exceptionally well with iOS and Android devices to offer a significant improvement in sound quality over the amplification and DAC available in the mobile device itself. It is engineered to enhance music playback from mobile phones and portable music players.
Aesthetically, the HA-2 does not look like a typical or generic electronic device. Its genuine leather casing with contrast stitching and bevelled aluminium edges are eye-catching and cannot be confused with any other product. Its fit and finish will instil a sense of pride when using the product.
Featuring hybrid class AB amplification and a USB DAC that supports 384 kHz PCM and DSD256, the HA-2 offers high performance digital-to- analogue conversion for Apple’s iPhone/iPod products, a wide range of Android devices, PC and Mac computers.
OPPO HA-2 may be conveniently used to charge mobile devices on-the-go and itself can be efficiently charged in 30 minutes. Headphones, from very sensitive IEMs to the most power-hungry full-size headphones, can all benefit from the HA-2’s excellent performance and powerful amplification.
High-resolution audio meets portability and style.
Hybrid Class AB Amplifier
The HA-2's power amplification circuit for the headphones is Class AB built with integrated circuits (ICs) and discrete transistors. The discrete transistor output stage uses hand-picked and matched parts. The output transistors are biased to operate in their most linear range for the critical small signal, and deliver their full potential when power is required.
Made for iPod, iPhone and iPad
The HA-2 passes Apple's "MFi" certification and is compatible with the latest iPod, iPhone and iPad to be used as the digital audio output accessory of these devices. By tapping directly into the digital audio signal of these devices and converting the audio to analogue using the high performance SABRE32 Reference DAC, music from your favourite portable device will sound its best. The data cables that come with your Apple device or the supplied Lightning cable is sufficient.
Compatible with Android
The HA-2’s micro-USB input port works with Android devices that support USB OTG (USB On-The-Go) and USB Audio Class. A special USB OTG cable is supplied with the HA-2 to facilitate the connection. When used with a compatible Android device, the HA-2 can support the device's built-in music app, tones and notifications. Additionally, a high-resolution music playback app can use the HA-2 as its external DAC to play lossless PCM and DSD audio files.
Audio-In and Line-Out
The HA-2 has a 3.5 mm Audio-In port to support portable music players that do not have a USB compatible digital output. While the HA-2 is used with one of its USB digital input ports, the 3.5 mm jack acts as Line-Out for the USB DAC.
The DAC is one of the most important components for digital audio playback. The ES9018-K2M DAC chip used in the HA-2 is the mobile version of the ES9018S used in our award-winning HA-1 desktop headphone amplifier. With the ESS patented 32-bit Hyperstream DAC architecture and Time Domain Jitter Eliminator, the SABRE32 Reference DAC delivers an unprecedented performance for mobile applications.
Asynchronous USB DAC
By bypassingthe built-in DAC and headphone amplification circuit of smartphones that are often cost-constrained, the HA-2 turns a smartphone into a high performance digital audio player. The asynchronous USB DAC input of the HA-2 also works with PC and Mac computers to replace the built-in sound card and support high-resolution audio playback with PCM up to 384 kHz 32-bit and DSD up to 12 MHz (DSD256).
Clean Signal Path
There is no DSP (Digital Signal Processor) in the HA-2. Volume control is operated by a combination of the DAC chip's internal digital volume control and an analogue potentiometer (the familiar volume knob). Bass boost is performed by pure analogue audio circuits. By avoiding re-digitizing the audio signal for volume adjustment or bass boost, the HA-2 provides a clean signal path for the audio.
For those who like a bit more punch and impact with their music, the HA-2 offers a Bass Boost function. With Bass Boost off, the HA-2 delivers a ruler-flat frequency response; with Bass Boost on, the HA-2 adds force and impact to the sub-bass region without muddling the important mid- to high-frequency bands.
Two Gain Settings
The HA-2 offers two gain level settings for optimal headphone matching. The High Gain mode is capable of driving large power-hungry headphones, delivering up to 300 mW into 16Ω headphones. The Low Gain mode is intended for sensitive IEM type earphones.
The HA-2 features patented VOOC rapid charging technology from OPPO. Using the supplied rapid charger, the internal battery can be quickly and safely charged to 70% capacity in about 30 minutes. It only takes approximately 90 minutes.
Mobile Power Bank
The HA-2 functions as an external battery pack to charge your mobile device. Utility and convenience are factors we wanted to address with the HA-2, so you can ditch the bulky spare battery pack and carry just the HA-2 with you mobile phone.
The HA-2 is housed in an aluminium chassis wrapped in genuine leather. The bevelled metal edges and contrast stitching on the leather are eye-catching. Its fit and finish will instils a sense of pride when using the product. The HA-2 meshes equally well in the pocket of an urban Millennial or on the desk of a business executive.
“The OPPO HA-2 headphone amplifier is a great companion to any smartphone or portable music player for enjoying high resolution music on the go.”
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