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OPPO designed the HA-1 headphone amplifier using the same universal approach taken with their Blu-ray players. Apart from being a high performance headphone amplifier, the HA-1 functions as an asynchronous USB DAC, stereo pre-amplifier, digital audio dock for mobile devices and a Bluetooth audio transport.
A fully balanced analogue audio section of the HA-1 with an emphasis on keeping the audio signal in the analogue domain once it leaves the DAC. Anchored by a hefty toroidal power transformer, OPPO HA-1 features linear power regulators and filters with custom made capacitors to ensure the headphone amplifier has a clean power source with plenty of reserve energy.
Hand-picked and paired discrete components of the fully balanced Class A power amplification section used ensures symmetry, and a motor-driven precision volume control knob allows for both manual and remote control volume adjustment of the OPPO HA-1 while keeping the audio signal in a pure analogue audio path.
Compatible with Apple iPod, iPhone and iPad for use as an external DAC, the HA-1 enables the listener to directly tap into digital music played from these devices.
Uncompromising audio performance.
Discrete Class A Amplifier
A Class A amplifier conducts signal over the entire range of the input signal cycle. The output transistors are biased to operate in their most linear range, and there is no crossover distortion caused by switching the signal between two push-pull devices. The HA-1's power amplification circuit for the headphones is Class A built with discrete transistors. The discrete design allows us to hand-pick and match the best parts to build the HA-1.
Fully Balanced Design
The internal analogue audio signal path of the HA-1 is fully balanced. For digital audio, the signal runs in balanced mode all the way from the DAC to the output jacks. Balanced analog input is kept intact, and single-ended input is converted to balanced at the input buffer. All single-ended outputs are derived from the balanced signal as well. The balanced design provides better common-mode noise rejection and improves signal quality.
Clean Signal Path
The HA-1 uses an analogue potentiometer to control the volume. By avoiding re-digitizing the audio signal for volume adjustment, the HA-1 provides a clean signal path for the audio. At the same time, the convenience of modern digital volume control is not lost - a remote-controlled motor turns the volume knob and a 10-bit analogue -to-digital converter samples the signal to display a numeric dB level.
Toroidal Power Supply
A toroidal power transformer offers superior power efficiency and much lower exterior magnetic fields over traditional laminated steel core transformers. The HA-1's toroidal linear power supply provides a very clean and robust power source to the audio components.
The DAC is one of the most important components for digital audio playback. The SABRE32 Reference ES9018 from ESS Technology is the world’s best performing 32-bit audio DAC solution targeted for high-end consumer applications and professional studio equipment.
Asynchronous USB DAC
By bypassing the low fidelity, poor quality DAC of traditional computer soundcards, the HA-1 turns any computer into a high performance multi-media source by converting digital audio to analogue through the ESS Sabre32 Reference DAC.
Made for iPod, iPhone and iPad
The HA-1 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.
Wireless Audio via Bluetooth
The HA-1 supports Bluetooth Advanced Audio Distribution Profile (A2DP) with both the standard and aptX high quality codec. Simply pair your phone with the HA-1 and set music free wirelessly from your mobile phone.
Stereo Pre-Amplifier with Home Theatre Bypass
The HA-1 doubles as a high fidelity stereo pre-amplifier with both RCA and XLR output ports. A special 'Home Theatre Bypass' mode can be assigned to any input source, making it very easy to integrate the HA-1 as a stereo pre-amplifier into a home theatre sound system.
Trigger Input and Output
When used as a stereo pre-amplifier, the trigger output can turn on your power amplifiers automatically when the HA-1 is turned on. You can also turn on the HA-1 automatically by connecting its trigger input to the trigger output of a source device or a surround sound processor.
Remote Control & App
The HA-1 comes with a remote control that provides volume control, direct source selection and even playback control for digital audio sources. A remote control app is available for both Apple's iPhone and Android-based smartphones. The app works over Bluetooth and offers the same functionality as the physical remote control.
Adjustable Gain Setting
The headphone power amplifier has an adjustable gain setting. For optimal sound quality and to best match your headphones' sensitivity, you can choose between Normal and High for the Headphone Gain setting.
The HA-1 is housed in a brushed aluminium chassis. The Class A amplifier naturally consumes more power and generate more heat than other types of amplifiers, so the HA-1 is designed with ample ventilation and built with the finest components to ensure long term stability and performance.
“The HA-1's ability to reveal more low-level detailing was immediately apparent. I could hear more of my recordings' reverberation and ambience.”
“The HA-1 is surely the best do-it-all DAC/preamplifier/headphone stage at the price.”
“The HA-1 is a well thought out and thoroughly engineered product at a competitive price. Its headphone amplifier stage is up there with the finest, and on high sampling rate material delivered via S/PDIF you hear it at its considerable best.”
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