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Tone2 Pro

Mini Desktop DAC & Headphone Amplifier
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XMOS XU216

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Balanced RCA

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ESS ES9038Q2M

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Multifunctional  Knob

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MQA Full Decoder

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Bluetooth Extension

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DSD 512 (Native)

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4 Output Channels

Pristine & Authentic Hi-Fi Experience

XMOS XU216 Audio DAC Chip with 16 cores & 16 threads
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XMOS XU216 processor for MQA Full Decoder, PCM 768KHz and DSD 512 (Native). Enjoy digital master-quality audio.

ESS High Performance DAC Chip
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Tone2 Pro continues with the time-tested ESS ES9038Q2M DAC chip paired with four TI OPA1612 operational amplifiers and three RT6863D power amplifiers at the buffer stage to provide balanced RCA output at ultra-low distortion (0.000126%) . Tone2 Pro can provide high power output and drive up to 300 ohm high-impedance Hi-Fi headphones easily, unlocking the true potential of your headphones for a high-fidelity listening experience.

Multiple Input/Output Methods

Tone2 Pro has multiple I/O interfaces on its compact chassis. 

Input: USB, S/PDIF, Bluetooth (external BT Magic dongle is required)

Output: Balanced RCA, Single-end RCA, 4.4mm balanced jack, 3.5mm single-end jack

You will be able to manually switch between a variety of audio input and output devices easily.

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Patented Balanced RCA

Khadas Balanced RCA is a new connector standard designed by Khadas with a 3-pin audio interface (positive / negative / ground). All metal contacts are gold-plated. Using a Khadas "Balanced RCA Male to XLR-3 Male Hi-Fi Audio Cable", Tone2 Pro is able to output balanced audio to legacy XLR-3 equipment.

Ground (Zero)

 Cold Line (Negative)

Hot Line (Positive)

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Solid Foundation
for a Low Noise Floor

A pair of low noise LDOs manufactured by ADI supplies power to the operational amplifiers. The DAC's analog output reference supply is channeled through ultra-low noise (1.2uVrms) LDO ES9311Q, with low loss, low temperature drift, and long life film capacitors to ensure the stability and reliability of the power supply, effectively controlling the noise from the  original stage.

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Precise Clock Management

Various audio components are carefully arranged on Tone2 Pro’s PCB layout. Two Accusilicon AS318-B series, active crystal oscillators with low phase noise and low jitter and one SiTime SiT8209 high performance active crystal oscillator at 100M enhance the low noise characteristics. The phase jitter is controlled within 0.5ps and the frequency drift is only ±10PPM, thus the data can be precisely shaped to achieve a unified clock.

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Ultra-low  Distortion
Accurate Reproduction

Two NJU72315 audio volume control chips with extremely low-distortion are embedded in the analog circuit. These chips control the distortion within 0.00016% and provide linear volume control and accurate reproduction of audio sources.

The analog IV and LPF circuits use four high-performance TI OPA1612 operational amplifiers, with 28 high-precision resistors at an accuracy of 0.1% and a low temperature drift of ±25PPM. This provides an accurate and stable RCA output.

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Couple Listening

Up to two people can listen together with a single Tone2 Pro. There are two headphone jacks on the right-side, a 3.5mm single-end and a 4.4mm balanced.  Listen with those we love.

The headphone jack uses three RT1238Q analog switches with a distortion of 0.000126%. These switches output high-quality audio signals and reduce the loudness of pop noises in the audio stream.

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One-Piece Machined Aluminium Shell

The upper shell and knob are made from one-piece of machined aluminum alloy. The logo on the shell and knob are accented with anodized gold. The shape of the chassis is avant-garde while the details comes in a variety of  colors to choose from.

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Selecting Power Supply

Tone2 Pro is powered by USB-C (USB) or I2S (Linear Power Supply), with a power path management chip from Texas Instruments. Power selection is easy.

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Multifunction Knob

Tone2 Pro integrates all its functional operations into the knob, by rotating and pressing the knob, you can select the input methods, change the output volume, and choose different hearing senses.
There is only one knob on the whole fuselage which makes Tone2 Pro concise and beautiful.

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External Bluetooth Module
Wireless in Seconds

BT Magic - a dedicated Bluetooth module developed for the Tone2 series which will be available soon supports AAC / SBC /

LDAC / aptX / aptX HD / aptX low latency and other common Bluetooth encoding formats.  Tone2 Pro  become wireless just in seconds with BT Magic, enjoy a wireless music experience.

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Audio Architecture

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Performance Parameters

Frequency Respond:

RCA Balanced:±0.15dB(20Hz~20KHz)

RCA Single End:±0.15dB(20Hz~20KHz)

4.4 Balanced:±0.15dB(20Hz~20KHz)

3.5 Single End:±0.2dB(20Hz~20KHz)

DNR:

RCA Balanced:121dB

RCA Single End:119dB

4.4 Balanced:121dB

3.5 Single End:119dB

Supported Sampling Rate:

USB:PCM 16-32bit/44.1-768KHz

            DSD Native DSD64-DSD512;Dop DSD64-DSD256

 

Coaxial:PCM 16-32bit/44.1-192KHz

                 DSD 64(Dop)

4.4 Balanced Output Parameter:

Output Power and Out Voltage:

42mW(5.0Vrms)@600Ω

83mW(5.0Vrms)@300Ω

167mW(5.0Vrms)@150Ω

211mW(2.6Vrms)@32Ω

154mW(1.57Vrms)@16Ω

THD+N:

-116dB(0.000158%)@600Ω

-116dB(0.000158%)@300Ω

-116dB(0.000158%)@150Ω

-110dB(0.000316%)@32Ω

-105dB(0.000501%)@16Ω

 

SNR:

121dB

Crosstalk:

>117dB@32Ω

3.5 Single End Output Parameter:

Output Power and Out Voltage:

8.8mW(2.3Vrms)@600Ω

17.6mW(2.3Vrms)@300Ω

35.3mW(2.3Vrms)@150Ω

125mW(2.0Vrms)@32Ω

114mW(1.35Vrms)@16Ω

THD+N:

-114dB(0.0002%)@600Ω

-114dB(0.000158%)@300Ω

-114dB(0.000158%)@150Ω

-108dB(0.000398%)@32Ω

-103dB(0.000708%)@16Ω

 

SNR:

119dB

Crosstalk:

>69dB@32Ω

Resources

FAQ

Why does Windows require the Khadas USB driver?

The Khadas USB driver provides ASIO support and removes the latency and sample rate conversion issue experienced with the default Windows USB driver for DACs.

What does MQA stand for?

MQA(Master Quality Authenticated) is an award-winning audio codec technology. The master MQA file is fully authenticated for high sample rate audio and is small enough to stream and download. 

What is balanced-RCA?

A new balanced audio connector standard, designed by Khadas for small form-factor desktop DACs. It is backwards compatible with standard RCA plugs and cables, more details visit https://khadas.com/balanced-rca

How do I use my existing XLR-3 equipment with Balanced-RCA?

Purchase the Khadas Balanced-RCA to XLR-3 adapter, it is a male Balanced-RCA plug connected to a male XLR-3 plug.

Add-ons

Expand the capabilities of your Tone2 Pro.
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