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Featuring the Latest Flagship Mobile DAC
Oppo's HA-2SE is an elegant yet sophisticated portable headphone amplifier with built-in rechargeable battery. It is engineered to enhance music playback from mobile phones and portable music players. Its genuine leather casing with contrast stitching and bevelled aluminum edges are eye-catching. It can be conveniently used to charge mobile devices on-the-go and itself can be efficiently charged in just 30 minutes.
"This is a DAC that the market will remember," reports Nathan in a March 13, 2015 post at Headfonia.com on the original HA-2. "I will be surprised if 2015 draws to a close with a single product impressing me as thoroughly as does the HA-2... And most pricier competition simply can’t stand up to the HA-2’s good looks, great typography, nearly flawless performance, and machine quality."
"The Oppo HA-2 Portable Headphone Amp and DAC will probably be one of the most exciting products to come out in 2015," notes Stephen Hornbrook at ReferenceHomeTheater.com, March 9, 2015. "It is incredibly well built, with a fit and finish on par with Apple products, includes one of the best DAC chips on the market, and has a quality Class AB amp capable of delivering all that Hi-Res Audio to power hungry planar magnetic headphones… Highly recommended."
ESS Sabre32 Reference DAC
The DAC is one of the most important components for digital audio playback. The ES9028-Q2M DAC chip used in the HA-2SE is the latest flagship mobile DAC developed by ESS Technology. 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.
Hybrid Class AB Amplifier
The HA-2SE's headphone amplification circuit 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.
Asynchronous USB DAC
A smartphone's built-in DAC and headphone amplification circuits are often cost-constrained and suffer from poor to mediocre performance. By bypassing these compromised circuits, the HA-2SE turns a smartphone into a high performance digital audio player.
The asynchronous USB DAC input of the HA-2SE 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 are no DSPs (Digital Signal Processors) in the HA-2SE. The volume control is operated by a combination of the DAC chip's internal digital volume control and an analog potentiometer (the familiar volume knob). Bass boost is performed by pure analog audio circuits. By avoiding re-digitizing the audio signal for volume adjustment or bass boost, the HA-2SE provides a clean signal path for the audio.
Audio-In and Line-Out
The HA-2SE has a 3.5 mm Audio-In port to support portable music players that do not have a USB-compatible digital output. When the HA-2SE is used with one of its USB digital input ports, the 3.5 mm jack acts as Line-Out for the USB DAC.
For those who like a bit more punch and impact with their music, the HA-2SE offers a Bass Boost function. With Bass Boost off, the HA-2SE delivers a ruler-flat frequency response; with Bass Boost on, the HA-2SE adds force and impact to the sub-bass region without muddling the important mid- to high-frequency bands.
Two Gain Settings
The HA-2SE 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 16-Ohm headphones. The Low Gain mode is intended for sensitive in-ear monitor type earphones.
Made for iPod®, iPhone® and iPad®
The HA-2SE passes Apple's "MFi" certification and is compatible with the latest iPod, iPhone, and iPad to be used as a digital audio output accessory for these devices. By tapping directly into the digital audio signal of these devices and converting the audio to analog using the high performance SABRE32 Reference DAC, music from your favorite portable device will sound its best. Furthermore, for users with high-resolution music playback apps, the HA-2SE does not require the use of a Camera Connection Kit (CCK). The data cables that come with your Apple device or the supplied Lightning cable is sufficient.
Compatible with Android
The HA-2SE’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-2SE to facilitate the connection. When used with a compatible Android device, the HA-2SE can support the device's built-in music app, tones and notifications. Additionally, a high-resolution music playback app can use the HA-2SE as its external DAC to play lossless PCM and DSD audio files.
Mobile Power Bank
The HA-2SE functions as an external battery pack to charge your mobile device. Utility and convenience are factors we wanted to address with the HA-2SE, so you can ditch the bulky spare battery pack and carry just the HA-2SE with you mobile phone.
The HA-2SE 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 to fully charge the battery. A quick charge gives the HA-2SE hours of operation time.
The HA-2SE is housed in an aluminum chassis wrapped in genuine leather. The beveled metal edges and contrast stitching on the leather are eye-catching. Its fit and finish will instill a sense of pride when using the product. The HA-2SE meshes equally well in the pocket of an urban Millennial or on the desk of a business executive.
Praise for the Original Model HA-2
"I will be surprised if 2015 draws to a close with a single product impressing me as thoroughly as does the HA-2. While it doesn’t revolutionize how you listen to your music, the HA-2 pushes quality features, safety, and class into a price bracket that has forever lacked anything but good price/performance splits. And most pricier competition simply can’t stand up to the HA-2’s good looks, great typography, nearly flawless performance, and machine quality."
"This is a DAC that the market will remember."
- Nathan, Headfonia.com, March 13, 2015
"The Oppo HA-2 Portable Headphone Amp and DAC will probably be one of the most exciting products to come out in 2015. It is incredibly well built, with a fit and finish on par with Apple products, includes one of the best DAC chips on the market, and has a quality Class AB amp capable of delivering all that Hi-Res Audio to power hungry planar magnetic headphones."
"The Oppo HA-2 is highly recommended by Reference Home Theater."
- Stephen Hornbrook, ReferenceHomeTheater.com, March 9, 2015