ONIX Zenith XDA20 High End DAC/Headphone Amplifier - Black

A Reference DAC That Takes Headphones Seriously

The ONIX Zenith XDA20 is the digital heart of ONIX's flagship Zenith series: a reference-grade DAC with a true high-power headphone amplifier built in. Where most DACs at this level treat the headphone jack as an afterthought, the XDA20 delivers up to 1,620mW into 32 ohms, real amplification for serious headphones.

Conversion is handled by dual flagship ESS ES9039PRO chips, one per channel, feeding a custom current-to-voltage circuit built from eight OPA1611 op-amps. An XMOS XU316 USB processor accepts PCM up to 32-bit/768kHz and native DSD512. The measured results are reference class: 0.0003% distortion and a 127dB signal-to-noise ratio from the balanced outputs.

A 3.4" color touchscreen and an included remote handle control, with high and low gain settings to match the headphone output to sensitive and demanding loads alike.

Built Like Separates, Sized Like One Box

Power comes from dual Talema transformers, separate supplies for digital and analog sections, filtered by four large Vishay capacitors, the kind of power-supply architecture usually found in separate components. The chassis is CNC-machined aluminum alloy, 12.6 pounds of it, designed to damp vibration.

Inputs cover USB, optical, coaxial, and I²S, with ten selectable I²S pin-out configurations to match virtually any transport, including ONIX's own XST20 SACD transport. Line outputs include both RCA (2.1V) and balanced XLR (4.2V), so the XDA20 can feed a preamp, integrated amp, or powered speakers as the digital centerpiece of a full system.

What Reviewers Are Saying

Steven Stone of The Absolute Sound, in a March 14, 2026 review pairing the XDA20 with ONIX's XST20 transport, found the combination "extremely transparent," writing that it "introduced no audible coloration to the harmonic spectrum and preserved the detail present in the recordings," and that the DAC "clearly revealed differences in recording techniques and mastering choices."

Who Is This DAC/Amp Best For?

• You want one reference source for headphones and speakers — flagship conversion plus a genuine 1.6-watt headphone stage.
• You own an SACD or CD transport — I²S with ten pin-out options, plus coaxial and optical, connect any disc spinner properly.
• You care about measured performance — dual ES9039PRO chips and 127dB SNR put it in reference territory.
• You want it to anchor a full system — balanced XLR and RCA outputs feed your amplification downstream.
• If you mainly want streaming built in, the XDA20 is a pure DAC/amp — pair it with a streamer or look at an all-in-one instead.

How Does It Connect to Your System?

Connect a computer over USB, a transport over I²S, coaxial, or optical, and headphones to the front 6.35mm jack with gain set to match. The RCA or balanced XLR outputs feed your preamp, integrated amplifier, or powered speakers.

The touchscreen handles input selection, filters, and settings, and the included XRC-3C remote controls it from the listening chair.

Pairs Well With

Building your system? Here are some great companions for the XDA20:

• Headphones: 1.6 watts deserves a reference headphone — see our Headphones.
• CD Player or Transport: Put the I²S and coaxial inputs to work — see our CD Players and Transports.
• Cables: Quality digital and XLR cables complete the chain — see our Interconnect Cables.
• Audio Rack: Give this 12.6-pound component a proper home — see our Audio Racks.

Frequently Asked Questions

How powerful is the headphone output?

Up to 1,620mW into 32 ohms in high gain (101mW in low gain for sensitive headphones), and 252mW into 300 ohms.

What DAC chips does it use?

Dual flagship ESS ES9039PRO chips, one per channel, with a custom eight-op-amp conversion stage.

What formats does it support?

PCM up to 32-bit/768kHz and native DSD512 over USB and I²S; up to 24-bit/192kHz over coaxial and optical.

What is the I²S input for?

It's a direct digital connection favored for disc transports, with ten selectable pin-out configurations for broad compatibility.

Can it feed my speaker system?

Yes. Balanced XLR (4.2V) and RCA (2.1V) outputs connect to a preamp, integrated amp, or powered speakers.

Does it include a remote?

Yes, the XRC-3C remote is included, alongside the 3.4" touchscreen.

See It in Action

tiyotiyo-Channel reviews the Zenith XDA20 up close:

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Learn More

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