Uncompromising Audio
built with the latest technology

The 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.

Class A Headphone Amp and Pre-Amp
Fully balanced analog inputs and outputs, purely analog volume control, and an adjustable headphone gain switch.

Toroidal Power Supply
A custom OPPO transformer provides clean power with plenty of energy reserves.

Mobile Device Support
Bluetooth with Apt-X codec for high quality wireless audio and a USB input for mobile phones and tablets.

ESS 9018 Sabre³² Reference DAC
High resolution performance with extremely low noise and distortion.

High Definition Audio Support
Numerous digital inputs including coaxial, optical, AES/EBU, and an asynchronous USB DAC input that supports PCM, DSD64 and DSD128.

Display Driven Interface
Physical volume and source selection knobs frame a 4.3-inch display for easy operation.

High Performance Audio

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 favorite playback software. The USB DAC supports PCM audio up to 384 kHz 32-bit resolution and DSD audio up to 256x the CD sample rate. The same ESS 9018 Sabre³²Reference 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 pre-amplifier, 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 aluminum 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.

Remote
Control App

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.

Uniquely Better

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 analog 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. The balanced headphone output provides twice the voltage and four times the power of the single-ended output, enabling the HA-1 to drive the most power hungry headphones. It also provides better channel seperation by eliminating the common ground return path.
Clean Signal Path – The HA-1 uses an analog potentiometer (the familar volume knob) 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 analog-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.

ESS Sabre³² Reference DAC – 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. With the ESS patented 32-bit Hyperstream™ DAC architecture and Time Domain Jitter Eliminator, the SABRE³² Reference DAC delivers an unprecedented DNR (Dynamic Range) of up to 135dB and THD+N (Total Harmonic Distortion plus Noise) of -120dB, the industry’s highest performance level that will satisfy even the most demanding audio enthusiast. To learn more about the technologies behind the exceptional performance of the SABRE DAC, please read the SABRE Technical White Paper.
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 analog through the ESS Sabre³² Reference DAC. The asynchronous transfer mode uses the high precision clock inside the HA-1 to drive the audio signal, not relying on the clock quality of the computer. HA-1's USB DAC input supports PCM up to 384 kHz 24-bit and DSD up to 12 MHz (DSD256).
Made for iPod®, iPhone® and iPad® – The HA-1 passes Apple's "MFi" certification and is compatibile 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 analog using the high performance SABRE³²Reference DAC, music from your favorite 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 Theater Bypass - The HA-1 doubles as a high fidelity stereo pre-amplifier with both RCA and XLR output ports. A special "Home Theater 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 theater sound system.
Trigger Input & Output – The HA-1 features 12V 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.
Build Quality – The HA-1 is housed in a brushed aluminum 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. Tipping the scale at 13 lbs, the HA-1 is a solidly built desktop headphone amplifier.

Specifications

Designs and specifications are subject to change without notice.

General
Dimensions (W x H x D)	10.0 x 4.8 x 12.2 inches, 254 x 80 x 333 mm
Mass	13.0 lbs, 5.9 kg
Power Supply	AC 110-120 V~ / 220-240 V~, 50/60 Hz 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, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
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, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz, 352.8 kHz, 384 kHz
PCM Word Length	16-bit, 24-bit, 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
Mobile USB Audio Input (USB A Type)
Input Format	Stereo PCM
PCM Sampling Frequencies	44.1 kHz, 48 kHz
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

DAC Performance Specifications

Specification	XLR Output	RCA Output
Output Level	4.6 ± 0.3 Vrms	2.3 ± 0.3 Vrms
Frequency Response (Tested with -10 dBFS / 384 kHz)	10 Hz – 170 kHz (+0/-3 dB) 20 Hz – 20 kHz (+0/-0.07 dB)	10 Hz – 170 kHz (+0/-3 dB) 20 Hz – 20 kHz (+0/-0.07 dB)
THD+N at 1 kHz (A Weight, 20 Hz – 20 kHz)	< 0.00056% (< -105 dB)	< 0.00056% (< -105 dB)
Channel Separation	> 105 dB	> 105 dB
Signal-to-Noise Ratio (A Weight, 20 Hz – 20 kHz)	> 115 dB	> 113 dB
Dynamic Range (1 kHz -60 dBFS, A Weight, 20 Hz – 20 kHz)	> 115 dB	> 113 dB

(Test condition: USB DAC input in Home Theater Bypass mode and the volume knob at Max position.)

Pre-amplifier Performance Specifications

Specification	XLR Input – XLR Output	RCA Input – RCA Output
Rated Output Level	4.6 Vrms	2.3 Vrms
Frequency Response	10 Hz – 200 kHz (+0/-2 dB) 20 Hz – 20 kHz (+0/-0.04 dB)	10 Hz – 200 kHz (+0/-2 dB) 20 Hz – 20 kHz (+0/-0.04 dB)
THD+N at 1 kHz (A Weight, 20 Hz – 20 kHz)	< 0.00056% (< -105 dB)	< 0.00071% (< -103 dB)
Channel Separation	> 120 dB	> 110 dB
Signal-to-Noise Ratio (A Weight, 20 Hz – 20 kHz)	> 110 dB	> 105 dB
Dynamic Range (1 kHz -60 dB, A Weight, 20 Hz – 20 kHz)	> 120 dB	> 115 dB
Maximum Gain (100 mVrms input)	6 dB	6 dB

(Test condition: Volume knob at Max position and an input signal to drive the output to the rated output level.)

Headphone Amplifier Performance Specifications

Specification	Condition	XLR Input - Balanced Output	RCA Input - 6.35 mm Output
Maximum Output Power (Per Channel)	Into 600 Ohm	2400 mW	600 mW
Maximum Output Power (Per Channel)	Into 32 Ohm	3000 mW	3500 mW
Rated Output Power (Per Channel)	Into 600 Ohm	800 mW	200 mW
Rated Output Power (Per Channel)	Into 32 Ohm	2000 mW	500 mW
Frequency Response		10 Hz – 200 kHz (+0/-1 dB) 20 Hz – 20 kHz (+0/-0.04 dB)	10 Hz – 200 kHz (+0/-1 dB) 20 Hz – 20 kHz (+0/-0.04 dB)
THD+N at 1k Hz (A Weight, 20 Hz – 20 kHz)	Rated Power	< 0.0018% (< -95 dB)	< 0.0056% (< -85 dB)
THD+N at 1k Hz (A Weight, 20 Hz – 20 kHz)	50 mW	< 0.001% (< -100 dB)	< 0.0022% (< -93dB)
Channel Separation		> 120 dB	> 90 dB
Signal-to-Noise Ratio (A Weight, 20 Hz – 20 kHz)		> 111 dB	> 111 dB
Dynamic Range (1 kHz -60 dB, A Weight, 20 Hz – 20 kHz)		> 120 dB	> 115 dB
Output Impedance		0.5 Ohm	0.7 Ohm

(Test condition: Volume knob at Max position and an input signal to drive the output with 600 Ohm loads to the rated output power, unless otherwise noted.)

"Made for iPod", "Made for iPhone", and "Made for iPad" mean that an electronic accessory has been designed to connect specifically to iPod® , iPhone®, or iPad®, respectively, and has been certified by the developer to meet Apple performance standards. Apple is not responsible for the operation of this device or its compliance with safety and regulatory standards. Please note that the use of this accessory with iPod, iPhone, or iPad may affect wireless performance.

iPad, iPhone, iPod and iPod touch® are trademarks of Apple Inc., registered in the U.S. and other countries.

Compatible iPod/iPhone/iPad Models
- USB works with iPhone 5S, iPhone 5C, iPhone 5, iPhone 4S, iPad (4th generation), iPad mini, iPod touch (5th generation).
- Bluetooth technology works with iPhone 5S, iPhone 5C, iPhone 5, iPhone 4S, iPad (4th generation), iPad mini, and iPod touch (5th generation).

All trademarks are the property of their respective owners.

Reviews

Review – Oppo HA-1 Headphone Amplifier

"... one of the most versatile audio products I’ve ever used ..."

Harris Fogel, May 29, 2014

Read More
OPPO HA-1 Headphone Amplifier Review

"... it's gorgeous to look at and dazzling to listen to."

John E. Johnson, Jr., May 15, 2014

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