Uncompromising Audio, built with the latest technologyThe analog audio section of the HA-1 is a fully balanced design with an emphasis on keeping the audio signal in the analog domain once it leaves the DAC. The HA-1 is anchored by a hefty toroidal power transformer, and linear power regulators and filters with custom made capacitors ensure that the headphone amplifier has a clean power source with plenty of reserve energy. The fully balanced Class A power amplification section uses hand-picked and paired discrete components to ensure symmetry, and a motor-driven precision volume control knob allows for both manual and remote control volume adjustment while keeping the audio in a pure analog audio path.
The HA-1 is especially suitable for high-resolution digital audio playback. Its digital inputs include coaxial, optical, balanced AES/EBU, and an asynchronous USB DAC. It is easy to connect the HA-1 to digital audio players or to a computer running the listener’s favourite playback software. The USB DAC supports PCM audio up to 384kHz 32-bit resolution and DSD audio up to 256x the CD sample rate. The same ESS 9018 Sabre32 Reference DAC and output driving stage used in OPPO audiophile Blu-ray players ensure extremely low noise and low distortion performance. The HA-1 is compatible with Apple’s iPod, iPhone and iPad for use as an external DAC, enabling the listener to directly tap into digital music played from these devices. For additional convenience, the Bluetooth audio transport with high quality aptX CODEC sets music free from your mobile phones with a performance boost.
OPPO designs the HA-1 headphone amplifier with the same versatile approach as the Blu-ray players. The HA-1 is a high performance headphone amplifier, and it doubles as an asynchronous USB DAC, a stereo preamplifier, a digital audio dock for mobile devices, and a Bluetooth audio transport. Users have a choice of using the 4-pin balanced XLR or the traditional quarter-inch headphone jack. Line level analog inputs and outputs are provided with both RCA and balanced XLR sockets.
The HA-1 sports a classic design with contemporary elements. It is a desktop component housed in an aluminium chassis, and the familiar volume and source selection knobs are complemented by a 4.3-inch color screen for easy operation. While music is playing, the screen can show a classic VU meter, a modern spectrum display, or detailed technical information about the audio signal. A supplied IR remote and a smartphone app provide complete control and convenience.
The OPPO Remote Control app provides a convenient way to control your OPPO HA-1 Headphone Amplifier from your mobile device. You will be able to switch input sources, adjust volume, mute/unmute audio, set the screen brightness level, and even control playback of digital audio sources.
SpecificationsGeneral Dimensions (W x H x D) 10.0 x 3.1 x 13.1 inches, 254 x 80 x 333 mm Mass 13.0 lbs, 5.9 kg Power Supply AC 110-120 V~ / 220-240 V~, 50/60Hz auto-sensing Power Consumption 70 W (operation), 0.5 W (standby) Trigger Input 3.5 V – 15 V, 10mA minimum Trigger Output 12 V, 100 mA maximum Operating Temperature 41 °F - 95 °F, 5 °C - 35 °C Operating Humidity 15% - 75% No condensation Recommended Headphone Impedance 32 ohm – 600 ohm Balanced Headphone Jack Output (XLR-4) Pin order 1: L+, 2: L-, 3: R+, 4: R-, Shell: GND 6.35 mm Headphone Jack Output Pin order Tip: L, Ring: R, Sleeve: GND XLR Balanced Audio Input Input Impedance 15k ohm Maximum Input Level 18 Vrms, +27.3 dBu (0 dBu = 0.775 Vrms) RCA Stereo Audio Input Input Impedance 10k ohm Maximum Input Level 9 Vrms, +21.3 dBu (0 dBu = 0.775 Vrms) Coaxial, Optical, AES/EBU Digital Inputs Input Format Stereo PCM Sampling Frequencies 44.1 kHz, 48kHz, 88.2 kHz, 96kHz, 176.4 kHz, 192KHz Word Length 16-bit, 24-bit USB DAC Audio Input (USB B Type) Input Format Stereo PCM, Stereo DSD (DoP v1.1 or native) PCM Sampling Frequencies 44.1 kHz, 48kHz, 88.2 kHz, 96kHz, 176.4 kHz, 192KHz, 352.8kHz, 384kHz PCM Word Length 16-bit, 24-bit, 32-bit DSD Sampling Frequencies 2.8224 MHz (DSD 64), 5.6448 MHz (DSD128), 11.2896 MHz (DSD256, native mode only) Profile USB 2.0, USB Audio 2.0 Mobile USB Audio Input (USB A Type) Input Format Stereo PCM PCM Sampling Frequencies 44.1 kHz, 48kHz Profile USB 2.0, USB Audio 2.0 VBUS Power Output +5 V, 2.1 A Bluetooth Audio Input Standard Bluetooth 2.1+EDR Profile iAP, SPP, AVRCP, A2DP Audio Transmission Format SBC, aptX