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HA-2SE

OPPO

Portable Headphone Amplifier and DAC

€399 €359

OPPO HA-2SE

Hybrid Class AB Amplifier

The HA-2SE’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

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.

Asynchronous USB DAC
By bypassing the smartphone’s built-in DAC and headphone amplification circuit that are often cost-constrained, 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 is no DSP (Digital Signal Processor) in the HA-2SE. 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.

Bass Boost
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.

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. While 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.

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.

Brand

Preamplifier (Info)

DAC, Headphone Amplifier, USB Input, 3.5mm Input (Aux)

Technical Specifications:

Dimensions (W x H x D):  68 x 137 x 12 mm
Weight: 175 grams
Frequency Response: 20 Hz – 200 kHz
Audio-in Level: 1 Vrms
Line-out Level: 1 Vrms
Recommended Headphone Impedance: 16 Ohm – 300 Ohm
Maximum Headphone Output Power(Per Channel): 300 mW into 16 Ohm
220 mW into 32 Ohm
30 mW into 300 Ohm
Headphone Amplifier Output Impedance: 0.5 Ohm
Output Jacks: 3.5 mm stereo headphone
3.5 mm stereo line-out
Input Ports: Analog: 3.5 mm stereo audio-in
Digital: USB A for iPod / iPhone / iPad; USB micro-B for smartphones with USB OTG feature and computers.
DAC Chip: ESS Sabre32 Reference ES9028-Q2M
Input Format: Stereo PCM, Stereo DSD (DoP v1.1 or native)
PCM Sampling Frequencies: 44.1 kHz  –  384 kHz, 16 / 24 / 32-bit
DSD Sampling Frequencies: 2.8224 MHz (DSD64), 5.6448 MHz (DSD128), 11.2896 MHz (DSD256, native mode only)
Profile: USB 2.0, USB Audio 2.0
Included Accessories: Power Supply Unit (Rapid Charging Charger)
USB A – USB micro-B data and rapid charging cable
USB A – Lightning data cable (for Apple devices)
USB micro-B to micro-B data cable (for Android and other smartphones)
3.5 mm – 3.5 mm stereo audio cable
Silicone rubber band (2 pieces)
User guide and warranty documents
Built-in Battery type: 3000 mAh lithium polymer rechargeable battery
Battery Operation Time: Approx. 13 hours for analog source via Audio-in; approx. 7 hours for digital sources via USB
Charging Time: Approx. 1 hour 30 minutes

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