Khadas Tone2 Maker Kit

Setup

The Tone2 Maker Kit can be connected to various devices for audio input and power:

• 1. Computer / Smartphone / SBC: Provides data input and power.
• 2. Khadas BT Magic Bluetooth audio receiver module / USB-C 5V linear power supply: Provides power. (BT Magic module sold separately)
• 3. CD player: Connects via S/PDIF coaxial input.
• 4. Pre-amp: Connects via analog output to an amplifier and then to Hi-Fi speakers.
• 5. Pre-amp: Connects via analog output to an amplifier and then to Hi-Fi speakers.

Interfaces

The Tone2 Maker Kit features several interfaces:

• USB-C (USB 2.0, DC 5V): For data and power.
• USB-C (I2S, DC 5V): For I2S audio input, requires specific cables for linear power supplies.
• Balanced RCA: For coaxial input, left line out, and right line out.
• Power LED
• RGB LED
• Encoder & Button
• CPLD (Intel 5M80ZM68)
• 14-Pin 0.5mm FPC: Connects to XMOS (XU208).
• 30-Pin 0.5mm FPC
• 40-Pin 2.54mm Header: Supports USB 2.0, GPIO I2S, UART, DC 5V.
• Shield Cover: Protects the analog circuit area.
• 4-Pin 1.2mm VIN Input: Accepts DC 4.8V~14V power input.
• 14-Pin 0.5mm FPC (USB 2.0, DC 3.3V)

Maker Guide

1. Document Download Instruction: Access schematics, specifications, and CAD files at dl.khadas.com/products/tone2/.
2. Website Introduction: For detailed information on functions, usage, and pin definitions, visit docs.khadas.com/tone2. For technical issues, seek help at forum.khadas.com. Purchase accessories at www.khadas.com/shop.

Driver Installation

1. Install the Khadas ASIO USB driver: Download from dl.khadas.com/products/tone2/driver/.
2. Restart your Windows PC: The driver activates after a restart.

Windows' default USB audio driver has high latency and low sampling rates. Installing the Khadas ASIO USB driver provides better performance and ASIO support.

Firmware Upgrade

1. Open the Khadas DFU Upgrade Tool: Download from dl.khadas.com/products/tone2/dfu_tool/.
2. Download the latest Tone2 firmware: From dl.khadas.com/products/tone2/firmware/.
3. Flash new firmware to Tone2: Connect Tone2 via USB-C and use the DFU tool.
4. Power off and restart your Tone2: To activate the new firmware.

For more details, visit docs.khadas.com/tone2.

Volume Knob

The volume knob can be used for various functions:

* With the external Bluetooth Module plugged-in and Tone2 powered off (USB cable with 5V power still plugged-in), long-press the volume knob for 5s to clear the Bluetooth pairing record.

Power Priority

The Tone2 Maker Kit prioritizes power sources as follows:

* Refer to docs.khadas.com/tone2 for power input priority details.

* The USB-C (I2S) interface is not standard. Use specific cables for linear power supplies.

Light Interpretation

Volume Indicator (Turquoise):

• Mute: Red light.
• 1-20%: Single turquoise light.
• 21-40%: Two turquoise lights.
• 41-60%: Three turquoise lights.
• 61-80%: Four turquoise lights.
• 81-100%: Five turquoise lights.
• HID volume adjusting: Flashes 3 times.

Track Indicator (Red):

• Track: Red light.

* HID volume adjusting refers to the system volume of the playback device.

Input and Filter Selection

Input Selection (Yellow, Red):

• USB
• S/PDIF
• I2S
• GPIO (I2S)
• AUTO

Filter Selection (Blue, Red):

• Linear fast
• Linear slow
• Mini fast
• Mini slow
• Apodizing
• Hybrid fast
• Brick wall

* In 'S/PDIF' mode, playback controls are not supported.

* GPIO (I2S) input is supported only in the Tone2 Maker Kit.

Audio Format Indication (RGB Ring Light in USB mode)

DSD Format (White):

• 64
• 128
• 256
• 512

PCM Format (Yellow):

• 44.1 / 48K
• 88.2 / 96K
• 176.4 / 192K
• 352.8 / 384K
• 705.6 / 768K

Encoder Locked Status

Encoder locked (White): Flashes 3 times when locked.

Power off (Grey): Indicates the device is powering off.

FAQ

• Connecting Khadas single board computers: VIM1S, VIM3, VIM3L, VIM4 can be connected via the 40-pin header (requires soldering a female header) or the 14-pin 0.5mm FPC header (requires Khadas T2V adapter board for VIM3, VIM3L, VIM4). Refer to docs.khadas.com/tone2 for details. Note: Soldering may void the warranty.
• Tone2 Maker Kit not powering on: Ensure the supplied voltage is between 4.8V to 14V and check the DC power connector's pin layout. Refer to docs.khadas.com/tone2.
• Electrostatic protection: 1000V for contact, 3000V for non-contact. Avoid touching PCBA circuits when powered on.
• Windows USB driver: Provides ASIO support and improves latency and sample rate conversion compared to the default Windows driver.
• Balanced RCA: A Khadas-designed standard for small form-factor DACs, compatible with standard RCA plugs and cables. More info at https://khadas.com/balanced-rca.
• XLR-3 equipment with Balanced RCA: Use a Khadas Balanced-RCA to XLR-3 adapter.
• 'S/PDIF' input: Connect via RCA and set input to 'S/PDIF' or 'AUTO'.
• Smartphone connection via Bluetooth: Attach a Khadas Bluetooth module to the USB-C (I2S) port and set input to 'I2S'.
• USB-C input with Android phones: Tone2 can be powered by most Android smartphones via USB-C.
• 'Auto' input mode priorities: USB has the highest priority. If USB playback stops, it switches to S/PDIF.
• iPhone/iPad connection: iPhone is not supported. iPad can connect via USB-C, but device information may not appear.
• Native DSD decoding: DSD512 native decoding is supported with the Khadas USB driver.
• Balanced RCA voltage level: 4.0Vrms for balanced, 2.0Vrms for standard RCA.
• TV coaxial signal to amplifier via RCA: Yes, use 'S/PDIF' or 'Auto' input mode.
• Powering USB (I2S) from PC: Not recommended. Use a linear power supply or battery bank.
• HID (system) volume adjustment: Turning the knob clockwise increases volume. At max volume, it flashes turquoise 3 times and then adjusts PC system volume.
• HID volume adjustment with DSD audio: Not supported.

* For the latest FAQ, visit khadas.com/tone2-faq.

Troubleshooting Guide

• Volume Knob unresponsive/flashing white: It's locked. Triple-press to unlock.
• Android phone not detecting Tone2 / power LED off: Enable 'USB-OTG' in phone settings.
• No sound from PC: Check PC sound output device is set to 'Tone2'. Ensure Tone2 input mode is 'USB' or 'Auto'.
• PC not detecting Tone2 / lights on: Ensure USB-C cable is plugged into the 'USB' port.
• No sound via S/PDIF input: Ensure music is not DSD formatted, as S/PDIF does not support DSD playback.
• HID volume control not working with non-DSD audio and USB input: Close other audio players. HID volume commands are sent to only one player at a time.

* For more technical assistance, visit forum.khadas.com/c/khadas-tone.

Specifications

Balanced RCA Line-Out Performance

• THD+N: 0.000126% (-118dB)
• DNR: 121dB
• Crosstalk, 200KΩ: > 120dB
• Noise level: 3.5uVrms
• Output, 200KΩ: 4.0Vrms

Single End RCA Line-out Performance

• THD+N: 0.000158%(-116dB)
• DNR: 118dB
• Crosstalk, 200kΩ: >118dB
• Noise Level: 2.3uVrms
• Output, 100KΩ: 2.0Vrms

What's In The Box

• Tone2 Maker Kit * 1pcs
• Instruction Manual * 1pcs
• Warranty Card * 1pcs

Manufacturer Information

Manufacturer: Khadas Technology Co., Ltd.

Tel: +86 755 2307 6626

E-mail: support@khadas.com

Address: Room 2709, Floor 27, Qiancheng Center, Haicheng Road, Xixiang Street, Bao'an District, Shenzhen

Website: www.khadas.com