Oppo HA-1 - Manual (Page 7)

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Introduction
The HA-1 Headphone Amplifier draws upon the proven circuit design of the BDP-95 and BDP-105 Blu-ray Disc players.
We designed the HA-1 headphone amplifier using the same universal approach we take with our Blu-ray players, so
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.
The HA-1’s analog audio section is a fully balanced, differential design with a Class A power amplifier circuit that is
capable of driving the most difficult of headphones. Throughout the design process, our emphasis was in keeping the
audio signal in the analog domain once it leaves the DAC. The HA-1 is anchored by a robust toroidal power
transformer with linear power regulators and filters with custom made capacitors to ensure the headphone amplifier has
a clean power source with plenty or energy reserves. Users have the choice between using a 4-pin balanced XLR or
traditional quarter-inch (6.35 mm) headphone connection.
The power amplification section uses hand-picked and paired discrete components to ensure symmetry. The volume
control knob is motor-driven and can be adjusted either by hand or via remote control while keeping the audio in the
analog domain. Line level RCA and balanced XLR analog inputs and outputs are available, and built-in monitoring and
protection circuitry guards against short-circuiting, overloading, and DC offset.
The HA-1 is ideally suited for high-resolution digital audio. It includes coaxial, optical, balanced AES/EBU digital inputs
as well as an asynchronous USB DAC controlled by a 16-core XMOS chipset that supports both PCM and DSD
formats. The same ESS 9018 Sabre
32 Reference DAC and output driving state used in our audiophile Blu-ray players
ensures high resolution performance with extremely low noise and distortion. You can easily connect the HA-1 to a
computer via USB and enjoy jitter-free music using your preferred playback software. For added convenience,
Bluetooth connectivity with the high quality aptX codec is also available.
Aesthetically, the HA-1 features a classic design with contemporary elements. It is housed in a thick aluminum chassis,
and its familiar volume and source selection knobs are complemented by a high-quality TFT LCD display providing
convenient access to the HA-1’s intuitive user interface. Depending on your preferences or the mood of the music
being played, you can choose between a classic VU meter, a modern spectrum display, or a simple informational
summary to be displayed on the screen. A supplied IR remote and smartphone application via Bluetooth provide
additional control and convenience.
The OPPO HA-1 Headphone Amplifier allows you to fully realize the potential of your high-end headphones. The HA-1
is a perfect match for OPPO Planar Magnetic headphones, and its power and versatility allow it to meet the demands
of the most discerning music lover.
Accessories
Ensure that the following accessories have been included with your OPPO HA-1 Headphone Amplifier:
User Manual
Power Cable , about 4.5 feet
Remote Control with Battery
Bluetooth Antenna
3.5 mm to 6.35 mm Headphone Adapter