Tone 1 | Khadas

Tone1

Professional Hi-Fi DAC for Audiophiles

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ES9038Q2M

ESS' flagship audio DAC provides unparalleled decoding quality.

XMOS XU208

XMOS's multi-core RISC controller provides rock-solid USB connectivity.

Professional Tuning

Professional Instrument's APx555 was used for tuning the Tone Board.

Lab Testing

THD + N, SNR, DNR, crosstalk and frequency response were measured.

XMOS XU208-128-QF48

8 cores up to 500MIPS, compatible with USB 2.0.

Ultra-Quiet Power

Ultra-low noise, high PSRR LDO designed to power Hi-Fi applications.

RCA Connector

High-quality RCA connectors, let you enjoy audio with delicate, clear, powerful and rich sound details.

ESS ES9038Q2M DAC

The industry's highest performance 32-bit mobile DAC with unprecedented dynamic range and ultra-low distortion.

Accurate Low-Noise Clock

Ultra-low phase noise crystal oscillator with excellent phase noise characteristics.

Compatible Audio File Formats

APE, FLAC, OGG, WAV, ACC, ALAC, MP3, WMA, DSD, and more!

Description

The Khadas Tone Board is a USB external Hi-Fi sound card specially developed for Khadas VIM SBCs by Khadas. Its superior performance and compatibility take the audio/visual experience to a whole new level. We integrated the advanced XMOS multi-core RISC micro-controller and ESS flagship 32-bit stereo mobile audio DAC ES9038Q2M into a small PCB. At the same time, we selected three independent high-performance OPAs and four ultra-low phase jitter oscillators for the audio system. Each power path is controlled by a separate ultra-low noise CMOS linear regulator with an OPA of ± 5.5V. In addition to the powerful hardware configuration, we also maximize the performance through excellent PCB design.

Performance

Data from ESS professional labs

Total Harmonic Distortion + Noise ≤ 0.000337%

Signal / Noise Ratio ≥ 120dB

Dynamic Noise Reduction ≥ 120dB

Crosstalk (Channel Separation) ≥ 127dB

Frequency Response ± 0.08dB

Sampling Rate and Compatibility

Ultra-Low Phase Noise Clock Jitter

Supports Multiple Lossless Audio Formats

Total Harmonic Distortion + Noise ≤ 0.000337%

Signal / Noise Ratio ≥ 120dB

Dynamic Noise Reduction ≥ 120dB

Crosstalk (Channel Separation) ≥ 127dB

Frequency Response ± 0.08dB

Two Versions

Generic and VIM editions

Generic Edition

The universal version is designed to work with a standalone Mac, PC or SBC via the built-in USB-C data and power port. There are additional un-soldered GPIO headers on the board.

VIM Edition

The VIM version is designed to "dock" with a Khadas Edge-V, VIM3L, VIM3, VIM2 and VIM1 SBC to form a complete Hi-Fi audio computer device. You can also use radiators and fans with the Tone Board.

Interfaces

Flexible I/O supports development

Khadas aims to gradually realize the ideas and dreams of makers to help them grow. The two versions of the Tone Board's RCA output interface are the same, both have 2 RCA for analog output @ 2.0Vrms, and 1 RCA for S/PDIF input or output.

Expansion:

x1 30-pin FPC connector for 8-channel analog output expansion
x2 10-pin FPC connectors for OLED display and I2S expansion

Other:

x1 40-pin female connector for VIM
x1 20-pin SMT header for debugging XMOS and VIM.

Users can directly connect their Tone Board to the PC via the USB-C interface, and the Tone Board is the ideal choice for audio developers. Khadas' New VIM Heatsink can also be used with VIM and Tone Board.

Compatibility

Tone board supports multiple oses

How to Install

Specifications

[1] Android supports only 44.1KHz output due to the Sample Rate Conversion(SRC) resampling implementations.
[2] Will also support other Single Board Computers (SBCs).