Go toLog in Go toSign up
Skip to content


Khadas & HiFiGo present the Tone2 Pro!
Your mini desktop Hi-Fi anytime, anywhere.

In collaboration with:


DAC + OPA1612 Op-Amps

Tone2 Pro combines the ESS ES9038Q2M with x4 OPA1612 operational amplifiers that deliver superior audio quality.

High Performance

Up to 32bit 384KHz sample rate, bit-perfect DSD512, and -118dB THD+N (line-out).

Hardware MQA Decoding

XMOS XU216 processor for full MQA decoding, enabling next-gen "original master quality" web streaming and audio playback.

Balanced RCA

Next-generation "balanced RCA line-out" with 3-pin output, sets a new interface standard for the Hi-Fi industry.

Linear Power Supply

Tone2 Pro has a second USB-C (I2S) port that supports 5V linear power supplies for ultra clean signal-to-noise ratios.


Tone2 Pro is our second generation Tone Board from Khadas that incorporates a variety of user feedback from our first-gen product, the Tone1. ESS ES9038Q2M DAC has been paired with four powerful OPA1612 operational amplifiers, and three buffer amplifiers. This 3-stage amplification pathway enables Tone2 Pro to drive a wide-range of demanding audiophile-grade headphones with impedances of up to 150 ohms. The OPA1612 was selected because it provides superior audio quality and excellent distortion characteristics; THD + noise is below 0.00008% throughout the audio range (20Hz to 20kHz).


Other additions to the Tone2 Pro include a 4.4mm balanced headphone jack in addition to the standard 3.5mm single-end jack. The Tone2 Pro's aluminum enclosure incorporates a hybrid digital/analog volume control knob, allowing you to rely entirely on analog signal attenuation for accurate sound reproduction. With not one, but two USB-C ports, you can connect a 5V linear power supply to the second USB-C port whilst having USB-C data on the first for excellent power-noise isolation. Finally we've added an industry-first balanced RCA line-out. These novel RCA ports have three signal-pins instead of two, yet retain the same size and form factor as regular RCA ports.


The latest addition to file format support is MQA decoding. The onboard XMOS XU216 processor enables bit-perfect, hardware-native, USB class II, asynchronous "unfolding" of MQA data for both web streaming and local high fidelity audio playback, enabling future-proof "original master quality" audio reproduction just as the artist intended, but at reasonable file sizes and streaming bandwidth requirements.



  • Tone2 Pro is as small as a pack of cards, and you can take it anywhere.

  • Powered by USB-C, compatible with PCs, laptops, tablets and phones.

  • Get a full-featured desktop Hi-Fi experience in a portable form factor.


  • Hybrid digital-analog control knob for headphone volume.

  • RGB LED ring for status indication and feedback.

  • Rotary-push encoder for mode selection.


  • Compatible with 5V USB-C linear power supplies.

  • Connect via Tone 2's secondary USB-C port (I2S).

  • Your LPS will take higher priority over USB power.


  • Tone 2 is designed to be used with those we love.

  • 3.5mm single-end headphone jack, paired with a 4.4mm balanced jack.

  • Each headphone jack is powered by an independent amplification pathway.


  • Custom designed slim-profile RCA jacks, ideal for portable applications.

  • Each Balanced RCA jack includes a third pin, for an inverse analog signal.

  • Backwards-compatible with standard RCA plugs (single-end mode).

To celebrate the release of upcoming Khadas Tone 2 Pro MQA Balanced DAC/AMP presented by Khadas and HiFiGo, We are giving away a unit of the Tone 2 Pro!! Now is your chance to be the first person in the world to experience this excellent device.

Upcoming Khadas Tone2 Pro Giveaway