Using Android OS, you can use SD-cards to augment the limited amount of storage on the eMMC. Make sure that you’re using a modern “high-speed” SD-card; something like a microSDXC UHS-I card will be suitable for this application.
Instructions:
Insert your SD-card into your VIM or Edge SBC.
Open the “Android-Settings” App (Gear Icon).
Select “Storage & Reset”.
Select your SD-card under “Removable Storage”.
Select “Set up as device storage”.
Tip: If you’ve done the above steps correctly, your SD-card will become a seamless part of your SBC’s eMMC storage. Exercise caution when unplugging your SD-card as some files and photos will become inaccessible! Make sure that you use the OS to “eject” the card first, before removing it physically.
Depending on your use-case, you may want to change/upgrade your Android OS to Ubuntu 18.04, or even run a custom dual-OS ROM. We refer to “operating system” files as “Firmware Images“, .img files, or ROMs. On our server, they are compressed into .7z containers, and will require WinRAR to unpack on Windows OS.
Tip: Changing operating systems will erase ALL the data on your eMMC. Unless the OS is meant to run from a Bootable SD-card (Booting Card), be sure to back-up all your data before following the instructions below.
VIM1/VIM2/VIM3 Upgrading Instructions:
Place VIM into Upgrade Mode.
Two ways to upgrade:
Upgrade Using A USB Cable - Burn an .img file to the eMMC, directly from a Ubuntu or Windows Host.
Upgrade Android Using An SD-Card - Burn an .img file to the MMC, directly from an SD-Card.
Edge Upgrading Instructions:
Place Edge into Upgrade Mode.
Two ways to upgrade:
Upgrade Using USB cable - Burn an .img file to the eMMC, from a Ubuntu or Windows Host.
Upgrade Android Using An SD-Card - Burn an .img file to the eMMC, from an SD-Card.
eMMC image: An eMMC image should be burned directly to the eMMC using a USB-C data cable, from a Ubuntu or Windows Host. It must not be burned into an SD-Card.
For Example: Android and Ubuntu distributions containing the EMMC mark.
SD/USB image: An SD/USB image should be copied into an SD-Card, before that card is then used to reformat the eMMC storage with a new OS.
For Example: Armbian, Ubuntu distributions containing the SD_USB mark, as well as LibreELEC and CoreELEC.
1. Join the Affiliate Program and Get Your Khadas Affiliate Link
The first thing you need to do to become a Khadas influencer is to sign up for the affiliate program. The application will require some basic information about your business and your audience. Follow the instructions to complete and submit your application.
After you submit your application, it will typically take a few days for Khadas to approve or deny your application.
Once you’re accepted, you’ll be granted access to your affiliate dashboard, where you can find and copy your unique affiliate referral link.
2. Add Your Referral Link to Relevant Content
You can start monetizing your content right away by adding your Khadas link directly to your blog posts, social medias or website.
Simply find content that shows how Khadas products will fit your audience’s needs.
Next, find the most relevant part of the post, and add your affiliate link with optimized anchor text.
Then all you have to do is keep creating content and wait for your audience to click your links. When they make purchases, you’ll earn 4%-10% per sale.
1. Easily join for free.
2. Earn 4%~10% commission from each referred sale.
3. Earn extra monthly Cash Bonus for sharing promotional activities.
4. Subscribe to our newsletter to be notified of new products and sale.
5. Continue to earn commission if the same customer buys additional products within 45 days (cookie tracking).
If you have any further questions, please do not hesitate to email us at support@khadas.com.
We will ensure that the performance of Tone2 Pro is higher than the Tone1. After formal tests are conducted with specialized equipment and test benches, we tend to leave this question to the reviewers who will review Tone2 Pro in the coming days. Qualitative sound-quality is highly subjective, with some people preferring a clean and flat output, whilst others prefer a warmer bass and a punchy high-range with more depth and space.
The single-end 3.5mm jack is designed with a depop chipset to cancel the pop noise, and has a max of 2.3Vrms output.
The balanced 4.4mm jack is designed to drive higher impedance headphones, and has a higher output at 5.0Vrms or greater; the depop chipset will draw down this performance and does not support higher outputs.
Commence your ODM project and pay the NRE cost when you are satisfied with the level of detail in both your PRD and the ERD. Experienced clients with in-house engineering teams are highly detailed; they may skip the PRD and send us an ERD. Clients conducting exploratory work or product studies, may only arrive with a PRD. In general, being more detailed results in less surprises and a smooth timeline. Being less detailed creates more space for innovation, but also a more unpredictable timeline and cost structure.
PRD means “Product Requirements Document” and should contain high-level information about the product which you intend to build. For example, it could contain the main features, and the user experience stories, labelled and prioritised from most to least important. It should be created with input from stakeholders across your company, as each stakeholder would have their unique requirements regarding your product. A holistic PRD ensures that your product will meet the requirements of both your company and your customers.
ERD means “Engineering Requirements Document”, and is usually written after the first-draft of your PRD. It contains technical details of your product's modules, their operating states, how they interact, the operating environment, required lifetime, obsolescence, and regulatory compliance. It also contains qualifying tests so that engineers can benchmark their designs against the ERD. The ERD will be written by Khadas and will also contain the estimated product BOM cost, timeline and other deliverables.
BOM means "Bill Of Materials", which is a list of parts and materials used to build your product. The BOM is a useful tool to determine the raw material unit-cost of your product. However, it does not include other external costs incurred during your "product's life-time", such as the NRE, Certification, Manufacturing, Shipping, Import Taxes, Green Taxes, Warehousing, Retail, Customer Service, Warranty, and Disposal.
During the development of your product, both the PRD and ERD will change when relevant feedback is collected from your project stakeholders, and the various development teams. When changes are made to the PRD and ERD, their impact on your timeline, costs and product quality must always be considered.
It will be useful to enforce "version control" for your PRD and ERD, with notes written down on why a particular change was made. Ensure that all stakeholders are aware of the decision, and that they are in agreement.
Yes we can do this. If you have specified your target markets in your PRD (usually this is determined by your marketing + management + logistics teams), we can figure out what type of certification is required for the markets that you have specified. Certification costs are not included in the NRE, and will be quoted separately.
Design files used within your product could be the intellectual property of Khadas (Shenzhen Wesion Technology Co. Ltd.). We understand that some clients need to acquire our design files in order to manufacture their product at home, rather than abroad in China. We are able to transfer the design files (PCB layout, BOM list, Software, Documentation, Source Code, Factory SOP, etc) after the client has paid us a "Design Transfer Fee". This fee varies from project to project.
Yes, you may send an email to: hello@khadas.com.
Customers outside of China may be subject to customs fees and / or import duties and taxes. These could be levied once a shipment reaches your country. You should contact your local customs office or tax authority for information specific to your situation.
Additionally, when ordering from this website, you are considered the importer of record and must comply with all laws and regulations of the country in which you are receiving the goods. Shenzhen Wesion Technology Co. Ltd. will not be held responsible for international orders that never make it past your country’s customs office.
Please check with your customs office before placing your order. No refund will be given for items that are seized by your local customs agents.
Control all materials and do IQC (we have stable suppliers for each component).
SMT factory will do full AOI: 1st round full-inspection of every board, focusing on PCBA functionality (We will determine the SOP for the factory).
Conduct a 4 hour PCBA aging test (for some projects).
If your product is assembled by us, we will conduct a 2nd round of testing. Qualifying tests would be specified within the ERD.
Our QC engineers will do a third and final round of testing. Our partners may test more specialised aspects, e.g. Wi-Fi antenna electromagnetic profile.
We recommend our clients to arrange for 3rd-party / in-house QC personnel to do their own QC of subjective variables, e.g. silkscreen colour printing, before commencement of packaging and shipment.
SOP means "Standard Operating Procedure" which in our case often refers to the factory's SOP. The SOP enables the assembly line workers to produce your product in a timely and accurate fashion; by following a set of sequential steps (procedures), that aims to eliminate assembly error and redundant actions.
Coaxial input. Originally we designed Tone2 Pro to support both Coax IN and OUT via the balanced RCA jack. You can use a standard RCA cable for Coax IN, and a balanced RCA cable for Coax OUT. But Tone2 Pro is likely to only support the Coax IN feature when it ships with the pre-installed firmware.
The XMOS XU216 processer is already maxed-out to achieve all features such as MQA, SPDIF OUT and PCM768. We may release special firmware to support Coaxial OUT for users who want to use the Tone2 Pro as a USB to SPDIF adapter, just note that a special cable(balanced RCA to single-end) is required to support the SPDIF Coaxial OUT.
Yes the Tone2 Pro supports external bluetooth modules via the secondary USB-C port labelled I2S. Note that the pin-layout of the USB port is non-standard. Users can select the input source using the volume knob (rotary-push encoder). Input sources: USB Data, Bluetooth (via USB-C I2S port), and Coaxial S/PDIF IN
Our official firmware will only control the headphone volume of the headphone jacks, line-out will have a fixed output volume. It’s still possible for volume knob to control the output of line-out via adjusting the volume register of the ES9038Q2M DAC. In that case, there will be two types of volumes:
DAC volume (digital) for both line-out and headphone jacks
Hardware volume (analog) for headphone jacks only
But we believe two volume controls will be too complex for most users, so we just fix the DAC's digital volume at maximum (highest performance), and only apply hardware volume control for the headphone jacks.
We may release dedicated firmware to enable control of the DAC's digital volume for the line-out, if this is required by specific users in the future.
LINEAR FAST: Linear-phase fast roll-off filter LINEAR SLOW: Linear-phase slow roll-off filter MINI FAST: Minimum-phase fast roll-off filter MINI SLOW: Minimum phase slow roll-off filter APODIZING: Apodizing fast roll-off filter HYBRID FAST: Hybrid fast roll-off filter BRICK WALL: Brick-wall filter Check the document below from ESS official website for further information: http://www.esstech.com/index.php/en/products/sabre-digital-analog-converters/audiophile-dacs/pre-tuned-reconstruction-filters/
The MagSafe attachment system is designed to only function with iPhone 12 or newer models, however Android phones can be equipped with a “magnetic ring accessory” that will mimic the behaviour of MagSafe. Note that a third-party phone case without a MagSafe ring, will weaken the attraction of the magnets.
We will produce an adapter or cable for existing products with XLR-3 connectors:
Balanced RCA to XLR-3 male adapter (0.2m)
Balanced RCA to XLR-3 male cable (1.0m)
You may purchase them at Khadas Shop.
We will also launch a balanced RCA cable when compatible products like Pre-Amp/Amp/Headphone Amps are available in the market.
The Tone2 Pro packaging is designed to be small to save on space and materials, so only a 1m length USB-C to C cable is provided inside the box. Those who require extra cables and converters can purchase them separately from Khadas Shop.
Please email us at hello@khadas.com to arrange an appointment before-hand. Our company’s address is D#2101A, Caifugang Building, Baoyuan Road, Xixiang Street, Bao'an District, Shenzhen, China 518102. (Baidu Maps: 深圳市宝安区西乡街道宝源路财富港大厦D#2101A(邮编518102))
‘Tea’ was created to satisfy a high demand from our community for a “portable Tone2 Pro”; many music streaming apps such as Spotify and Apple Music now have high-quality lossless music that can only be fully enjoyed when you connect a portable DAC such as the ‘Tea’ to your Android or iOS smartphone.
Yes, a normal USB-C adapter can work and the 4.4m JACK is wired per standard specifications. Tone2 Pro has 7 connectors:
* USB Port: it can connect to a PC/phone/tablet PC and so on. * I2S Port: it can supply audio from our Bluetooth module, or 5V power input from a linear power supply. * Orange balanced RCA: it can be used for coaxial input and coaxial output. * White balanced RCA: the left balanced signal or left unbalanced signal output. * Red balanced RCA: the right balanced signal or right unbalanced signal output. * 4.4mm headphone Jack: connect to your 4.4mm headphone. * 3.5mm headphone Jack: connect to your 3.5mm headphone.
The Tone2 Pro is designed to drive low impedance headphones with a maximum of:
* 150ohm for the 3.5mm single-end jack * 300ohm for 4.4mm balanced pentaconn jack
To drive 600ohm headphones, we will suggest that you connect an independent headphone amplifier to the RCA line-outs for more powerful and distortion-free sound.
There are three kinds of audio source inputs:
* USB 2.0 Input,“USB” marked * Coaxial(SPDIF) Input, “Coax” marked * Bluetooth Input,“I2S ”marked,which you need to buy a Bluetooth module to plug into.
I think coaxial input may be the best option for your projector. In most cases, the projector will accept HDMI input from a PC, and you can connect your PC directly to your Tone2 Pro over USB.
Most visitors from overseas will arrive at Shenzhen Bao’An International Airport (深圳宝安机场). You can request for our staff to pick you up by car from the second-floor Departure Hall, Gate 4 to 8; ask the airport staff for instructions on how to go from the Arrival Hall to the second-floor Departure Hall.
There are only 2 hotels near our office that are able to accept foreign guests (automatic local police registration, acceptance of foreign credit/debit cards).
5-Minute Walking Distance:
Avante Garde Hotel (前岸国际酒店), which is a 5-star accommodation. ~580 RMB/night.
Wandu Traders Hotel (万都酒店), which is a 4-star accommodation. ~360 RMB/night.
If you’re staying with a local friend or relative, it is required by Shenzhen law to register your residential address with the local police precinct within 24 hours after your arrival. Ask our staff for instructions on how to do so using WeChat. If you’re staying at the hotels mentioned above, they would perform this service for you automatically.
Unfortunately, not all local ATM Machines are compatible with your overseas VISA or Mastercard. The only machines known to be compatible are the ABC Bank ATMs situated directly outside Times Square Mall (时代城). You may also use Bank of China ATMs wherever you see them. Please be wary of your surroundings at all times when withdrawing cash, and avoid doing so late at night.
There is a large selection of tasty and affordable Chinese cuisine available around our office. Avoid eating too much deep-fried food, as the oil they use isn’t up to foreign-standards.
Times Square Mall (时代城) next to Pingzhou (坪洲, Line-1) metro station offers a narrow range of Western choices, e.g. McDonalds. For more options, go to Rainbow Mall (天虹) next to Xixiang (西乡, Line-1) metro station or Yi Fang Cheng (壹方城) next to Baoti (宝体, Line-1). Both are accessible from Pingzhou (坪洲, Line-1) metro station which is a 7-minute walk from our office.
For Muslim guests, you may ask our staff to recommend local Xinjiang (新疆) restaurants that offer affordable and tasty Halal meals; noodles, soups, burgers, stir-fry vegetables.
Download the WeChat app from the Apple or Android App Store. Sign-up for a new account with your telephone or email address, and add your VISA or Mastercard. You can give cash to our staff and they can send you the corresponding amount via WeChat for you to spend later. Scan a shop’s QR Code to send them RMB, or reveal your QR Code to the shop so they may deduct RMB.
China's Internet is separate from the Global Internet. In addition to using a different set of DNS servers, the Great Firewall (GFW) restricts access to foreign content, media and communications platforms.
WhatsApp, Telegram, Line, Facebook, Messenger, Slack, Discord, Gmail, Yahoo, and YouTube will be unavailable. It will be wise for you and the parties you are corresponding with to open WeChat accounts before you enter China, so that you may maintain communication with them without needing a VPN.
WeChat supports text, audio, picture, video, voice call and video call functionality, so you’ll definitely be able to keep in contact.
Before entering China, install a VPN on your smartphone and laptop: We recommend installing at least 2 different services, for example ExpressVPN (paid) and Betternet (free). The Great Firewall (GFW) uses Deep Packet Inspection (DPI), and VPNs will either be cut-off after sometime, or be very unstable with low packet transmission rates.
Having 2 different services on your devices will enable you to switch when one service becomes temporarily unavailable. The Tor-Onion-Protocol does work in China, provided you use a suitable Bridge-Relay, however it is much slower than a traditional VPN. Our office also uses a professionally managed VPN service, it may however be unstable at times.
Due to the success of the Tone2 Pro, our sales team has noticed unauthorized distributors and fake listings popping up on smaller, less regulated online sales platforms.
Please avoid buying from unauthorized sellers as there is no guarantee that an actual product will ship to your home.
In addition, we can only provide after-sales support and warranty to products purchased through official sales channels and authorised distributors.
Please refer to the "Our Partners" section found on https://khadas.com/shop, for authorized sales channels and distributors.
The ESS ES9038Q2M DAC does not support MQA decoding. In the case of Tone2 Pro, the XMOS processor XU216 does the MQA decoding. The I2S input on the USB-C port, GPIO pins, and the SPDIF-IN are routed to the ESS DAC directly, and not through the XMOS processor; therefore these inputs do not have MQA decoding support.
Contact us via Khadas Forum, or hello@khadas.com, to notify us about your issue first. Be sure to include the following details:
Email Subject:
"Repair: [Fault Description] (Purchasing Channel, Order-ID)"
Email Contents:
Description of your problem, and steps to reproduce it.
Photographs.
Videos (optional, to reproduce problem).
Purchase Channel (e.g. Khadas Shop, Gearbest, Amazon, local distributor, etc).
Order-ID.
Certain problems may be resolved locally, without incurring the cost and time of return shipment. In some cases, we may also send you a replacement, without the need for a product return.
1. Go to your local Post Office.
2. Mark value as: "$5 USD".
3. Choose type: "Gift".
4. Shipping Address:
Address: Room 2701, Floor 27, Qiancheng Center, Haicheng Road, Bao'an District, Shenzhen, China 518101
City: Shenzhen
Province: Guangdong
Country: China
Postal code: 518102
5. Shipping Recipient:
Attention: Willow
Mobile: +86-18038034175
6. If possible, please add this Chinese address to the outside of your package to speed up delivery.
Address: 深圳市宝安区海城路前城中心27楼2701室 (邮编518101)
Contact: 李春柳 +86-18038034175.
7. Add a note to the outside of your package (include Purchasing Channel, Order-ID):
"Repair: [Fault Description] (Purchase Channel, Order-ID)".