The SU-2 digital interface is a high-performance USB digital audio interface. The microprocessor with the latest ARM Cortex-M4 as the core is used as the main control of the USB data part. SU-2 uses a self-developed ultra-low jitter clock system (ACCUSILICON's AS-318B series, which achieves ultra-low jitter at the femtosecond level). A large-capacity FPGA serves as the digital audio data processing core and has a standard USB2.0 input interface. Rich output interface, including XLR balanced output AES, coaxial RCA and BNC, I2S interface with HDMI socket output, perfect master clock and word clock (WCLK) output. SU-2 supports external 10Mhz clock input, using common 50 ohm input impedance design.
The SU-2 is not only a USB interface, it can also be used as an independent master clock product.
1. When used as an independent master clock, it can output a word clock of 44.1K-384K, or output a master clock of 22.5792Mhz-49.152Mhz. (When not connected to USB, it will be used as the master clock device by default)
2. When using an external 10Mhz clock input, it can also be used as a frequency converter; support 10Mhz to 44.1K-384K word clock, or output 22.5792Mhz-49.152Mhz master clock.
SU-2 is a new architecture USB interface developed by us to replace the original SU-1; PCM sampling rate supports up to PCM 768K, and DSD supports up to DSD1024. Using a large FPGA as the core of the processing processing, we decentralized some of the FPGA algorithm technology of the flagship interface SU-6 to the SU-2; its positioning in the mid-to-high-end interface mainly uses the following three unique technologies:
1. Full isolation technology (ground isolation), using 150Mbps full isolation chip, can completely isolate the interference from the PC;
2. Source synchronization technology and FPGA shaping technology, reshape the I2S signal after isolation; thus eliminating the additive jitter brought by the isolation chip;
3. Self-developed clock system, using ACCUSILICON high-performance crystal oscillator, low phase noise, low jitter; you can also choose external 10Mhz clock, support various atomic clocks, constant temperature crystal, GPDSO input.
This product supports two kinds of AC power voltage, 230V and 115V respectively. Please choose the volts suitable for your country's voltage. The driver was updated in June 2019. The latest version is V4.67. The latest driver supports DSD1024 and DSD NATIVE modes.
Sampling rates supported by each output interface:
PCM: 44.1KHz, 48KHz, 88.2KHz, 96KHz,
176.4KHz, 192KHz, 352.8KHz, 384KHz, 705.6KHz, 768KHz
[Where I2S out supports all sampling rates, S / PDIF supports up to 384KHz, DOP128]
2.8 MHz (DSD64)-DOP, native
5.6 MHz (DSD128)-DOP, native
11.2 MHz (DSD256)-DOP, native
22.5792 MHz (DSD512)-DOP, native
45.1584 MHz (DSD1024)-native
[Which I2S out supports all DSD formats, S / PDIF and AES / EBU support DSD128 DOP mode]
Bit width: up to 32 bit over I2S output
24 bit over S / PDIF
Electrical standards for each interface:
1. The USB input socket is a standard USB-B female socket, and the USB power supply range is 4.5V-5.1V;
2. The RCA interface outputs standard S / PDIF signals with a level of 550mV (connected to a standard load) and an output impedance of 75 ohms;
3. The power input is 115V / 230V AC, and the internally imported transformer is used for power supply.
1. We attach great importance to the design of power supply circuits, using LDOs with high performance, low noise and fast response as the main power supply. The entire board uses multiple independent LDO power supplies, and the clock part even uses ADI's ultra-low noise LDO, which lays a solid foundation for ensuring the ultimate output performance.
2. The PCB main board adopts a 4-layer circuit board design to ensure a complete ground plane and power layer. A high-speed digital design method is used to ensure the signal integrity and power integrity of the entire board. The clock signal is specially processed, and the grounded design and precise impedance control are adopted to ensure the clock signal quality and improve its anti-interference ability. The input and output signals follow the standard design, especially the USB high-speed signals use 90 ohm differential impedance control.
1, Windows 7, Windows 8, Windows 10; 32/64 bit, special drivers need to be installed
2, Native MacOS 10.6 and later, using the system's own driver
3.Native Linux with UAC2 compliant kernel, using the system's own driver, (tested on Ubuntu and Daphile systems, based on INTEL X86 platform)
4, Android OS 4.2 and above, the device needs to support the OTG function. Generally speaking, Android 9.0 and above systems are supported by default. It is recommended to use it with specialized players below 9.0.
I2S interface uses HDMI socket output:
1. 3.3V LVDS differential signal;
2. DSD ON signal, 5V power supply (small current), CPLD has been processed inside the MUTE signal, and there is no need to output the MUTE signal;
3. The DSD ON signal can be defined by itself. The DSD ON signal can be arbitrarily output to the PIN 13, 14, 15, 16 pins of the socket.
Flexible I2S and clock output configuration:
1. Switches 1-4 correspond to the PIN13-16 pins of the HDMI socket. Pull to the ON position, it means that the HDMI PIN has the function of DSD_ON.
2. Switches 5 and 6 are the modes that configure the clock output:
When the switch 5 is OFF, the clock outputs MCLK, and when it is ON, the clock outputs WCK.
Switch 6 configures the frequency of MCLK, which is 22.5792M / 24.576M when OFF, and 45.1584M / 49.152M when ON;
The configuration of switch 6 is valid for CLK OUT, RJ45-I2S, and HDMI-I2S.
3. Switch 7 can set the left and right channels in DSD mode in I2S signal separately.
4. Switch 8 can set the BCLK line sequence in the I2S signal; when OFF, PIN4 is BCLK + and PIN6 is BCLK-;
5. Switch 9 can set the line sequence of LRCLK in I2S signal; when OFF, PIN7 is LRCLK + and PIN9 is LRCLK-;
6. Switch 10 can set the line sequence of DATA in I2S signal; when OFF, PIN1 is DATA + and PIN3 is DATA-;
The SU-2 can be configured via SW switches to suit different I2S standards.
However, as far as we know, HDMI-I2S is different for every manufacturer in the world. For most manufacturers, HDMI-I2S is a proprietary protocol of the manufacturer. Therefore, I'm sorry, SU-2 cannot adapt to all HDMI-I2S machines, so we cannot accept returns due to incompatible I2S interfaces.
Case size and packaging:
Case L*W*H: 234MM * 170MM * 46MM, excluding the height of the feet and the protruding part of the connector on the back of the case.
Stand-alone weight: 1.8KG.
L*W*H of carton package: 350MM * 230MM * 110MM.
Shipping package weight: 2.3KG
Accessories: a USB cable and a power cable.
QUESTIONS & ANSWERS
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The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 2 International shipping methods. Priority worldwide shipping and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays.
Option 1. Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way)
!!!Express Free worldwide for orders over US$500!!!
The estimated time of delivery is usually 3-7 Days depending on the country. Includes detailed Tracking and confirmation of delivery.
For some remote areas, there may be an additional surcharge of US$ 35.
If you are unsure whether your location is considered a remote area, we recommend contacting us to confirm.
Option 2. Priority shippingSome areas we could provide priority shipping service, The estimated time of delivery for each country is outlined in the table below. We offer EU*/JP/US/CA priority shipping free if order value is over $100. And most countries are with tax and duty free if we marked it is with all tax and duty paid.
America (with all tax & duty paid)
Europe (with all tax & duty paid)
Oceania (with all tax & duty paid)
Australia: 1-2weeks ,average 10days
South Africa: 1-2weeks, average 7days
Registered Airmail service
We have stopped the normal registered airmail service due to the extremely long delivery times which made us unable to guarantee the delivery of your order before a certain date. Due to these circumstances and lack of tracking information. We've decided to not offer this shipping option. We appreciate your understanding.
If you chose Express (DHL/UPS/Fedex etc) : You are responsible for paying taxes and duties. But we usually declare an item at a lower value , leave us a message with the desired value if you want.
If you chose Priority service: All tax and duty paid by Hifigo.
You can Track Your Order by clicking here.
Please note: It can take up to 24 business hours for your tracking number to become active. In some cases, It may take up to 3 business days to update.
Shopify supports only one currency that is US Dollars. On payment, it gets automatically transferred to US dollars. Due to the currency exchange rates fluctuating almost daily, the prices in other currencies on our store at HiFiGo is just for your reference. Final price might be a little bit higher or lower depending on the current dollar rate.
After you place your order, you will receive an email with your order confirmation.
After your order processes, you will receive another email with tracking information and you will soon be able to track your order.
1.All orders ship from our warehouse in China within 1-3 business days unless stated otherwise. Please allow 1-3 days of processing time. Some items may require a longer ship-out and/or delivery timeframe. We will notify you immediately about the expected delivery timeframe, with the option of canceling your order for a full refund.
2.We will ship the product with the correct power voltage selection and adapter according to your country in shipping address. If your requirement is different with your country standard, please email us.
Packaging samples for different size of items
Why hasn't my order shipped yet?
Typically, it takes about 1-3 Business Days of processing time before we ship your order. We ask that you allow us 1-3 Business Days to process your order!
We want is to make sure that all the items of your order are prepared correctly before they are shipped out. You will receive an email to confirm that your order has been shipped. So please check your inbox in 1-3 Business Days.
I've received a tracking number for my order. Why is my tracking not working?
Although your order can "ship", sometimes the online tracking will not update until 24 hours later. Usually, expect to see updated tracking information on the next business day after you receive your confirmation email/SMS. We appreciate your patience.
How can I track my order?
- Simply click on this link here to be redirected to the order tracking page.
- Enter the tracking number found on your order confirmation email.
- You will see up-to-date shipping information about the status of your order.
If You Have Any Questions Or Concerns, Please Contact Us so that we can help you.
Non condition Returns
We offer a 7-Day Return Policy. You have 7 days to return an item from the date that you received it. (confirmed by Shipping Tracking record). To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in it's original packaging. If it is plastic sealled when you get it , it should remain plastic sealled. Some types of goods such as CIEMs cannot be returned.
You will be responsible for paying the shipping costs for returning your item. Shipping costs we send the product to you are non-refundable（ write us in advance how much it is）and Custom Duty when it come back to China is non-refundable too ( we will send you receipt after we get it ). If 7 days have gone by since you received your item, unfortunately, we can’t offer you a refund or exchange.
Warranty Reason Returns
If the product doesnt work properly during warranty leadtime and confirmed to be defective , the item could be returned for repair and HiFiGo will afford half freight to ship it back. HiFiGo also will afford the freight to send it back to you after repair.
Wrong Item reason Returns
Pls contact us at very first time if you get the wrong item and dont use the product , keep the package as original as it is and we will cover all the freight and tax back and send you correct one immediately.
We may refund you for following reasons,
1. Returned items due to the policy of returns once we get it.
2. Order cancellation
3. Other reasons.
If you paid by credit card, It will arrive you within 7 working days usually. The time will depends on the bank handling time. If you pay by paypal, It will arrive you within few hours. If you didnt get the refund during above leadtime, write us to check the reason.
Refunded amount may be slightly different with your original national currency payment due to Currency Exchange rates varying, HiFiGo is not responsible for the difference.
There may be transaction fee deducted by your bank when order is cancelled or refunded fully or partially, HiFiGo is not repsonsible for this if your bank charge you any additional fee.
We only replace items if they are defective or damaged.
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.
How long is the warranty period?
HiFiGo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the brands listed below:
Topping, Matrix, Gustard: 2 years warranty
Fiio music Player: 2 years warranty
Should the Product(s) supplied by HiFiGo prove defective because of improper workmanship or material as reasonably determined by us, HiFiGo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.This warranty extends only to personal use & does not extend to any product that has been used for commercial use, rental use, or use which is not intended. There are no warranties other than expressly set forth herein.
THE WARRANTY DOES NOT APPLY TO THE FOLLOWING
- Damage due to user negligence, accidents, dis-assembly, waterlog, misuse, abuse, alterations or vandalism.
- Improper or inadequate maintenance.
- Failure to perform required preventive maintenance
- use not following the ‘User Guide’ or any additional safety, use, or warnings included in the product materials.
- Unauthorized modification or commercial use.
- Damage in return transit.
- Unsupervised use by children under 18 years of age.
- Accidents, abuse, misuse, improper installation, problems with electrical power, acts of third parties.
- Products that are altered or repaired by anyone not authorized by HiFiGo
- usage not following instructions accompanying the Product(s)
- failure to perform required preventive maintenance,
- weather conditions, lightning, fire, water, or any acts of nature
- Furthermore, HiFiGo is not liable for incidental or consequential damages of any nature resulting from the use of this product and any liability shall not exceed the purchase price of the product.
Disclaimer of Warranties - Except as set forth herein, HiFiGo disclaims any and all warranties and representations other than those explicitly specified in this contract; any warranties, if separately provided in writing, are extended only to the Buyer whose name is shown on this invoice/contract. Warranties do not cover product damaged by external causes, including accident, abuse, misuse, improper installation, problems with electrical power, acts of third parties, Products that are altered or repaired by anyone not authorized by HiFiGo, usage not following instructions accompanying the Product(s), or failure to perform required preventive maintenance, including but not limited to backups, problems caused by use of software, parts and components not supplied by HiFiGo, weather conditions, lightning, fire, water, or any acts of nature; HiFiGo shall not be obligated to provide any warranty service or obligations unless customer has paid its invoices in full under this or any other HiFiGo invoice. HiFiGo shall have the sole discretion in determining whether the Product is covered under the warranty for labor and/or warranty for parts
Governing Law - This contract shall be governed and construed per the laws of the People's Republic of China. Buyer agrees that competent courts in the People's Republic of China shall have the exclusive jurisdiction over any legal action concerning this contract. In the event of any dispute related to this contract, the prevailing party shall be entitled to reasonable attorneys' fee and costs.
How can I Request a Warranty replacement or repair?
You must email our customer service email@example.com within the applicable warranty period with your order number and your specific inquiries. Please describe your problems that you encountered with as musch detail as you can.
Can I cancel an order?
Once an order is placed, you have less than 24 hours to cancel it if it is not processed yet. Once the order processes and is accepted by our warehouse, you may still request cancellation, however please know that cancellation at that stage is not guaranteed.
Can I return the products that I don’t like and get a refund?You may request to return an item in the condition it was received if you change your mind. Some items may be returned for either money back or exchange subject to the following conditions. Our policy is within 7days after receiving according to the tracking record. If 7 days after receiving have gone , unfortunately we can’t offer you a refund or exchange.
- Any item returned must be complete with all accessories, hardware, manuals or instructions, and in the same "new" condition as when it was when shipped to you. Please send us the photos or videos of it.
- Any item returned incomplete or with physical damage such as scratches etc., excessive signs of use or abuse will not be accepted for return.
- Any item returned will be evaluated upon receipt. Of course, we cannot give refunds on defective merchandise resulting from mishandling, misuse, tampering or improper use.
Can I exchange a product that I ordered?We offer exchange service if the items in following conditions. (*Except Non-refundable & Non-exchangeable items)
- Products must in “Good Condition” with no damaged in any way.
- To exchange a product, the product must be available to purchase on Hifigo.com and its price must be higher or equal to the original order amount.
- The customer will have to pay the difference in price if s/he selects a product of a higher price.
- If you have purchased any items with any discount offered by a joint promotion or other promotional activities but the discount offer has expired at the time of the exchange, the discount shall not be taken into account. Discounts offered by companies other than HiFiGo shall be dealt with per the terms and conditions of the relevant companies.
What’s the process of cancelling, returning or requesting a refund ?Please email our customer service firstname.lastname@example.org with your order number and the reason for the return. Please pack the product carefully.
You must return an item in the same condition as it was received. You must also include, in the same condition as it was received:
- All packaging such as boxes, bags, and tags
- Accessories such as cords and remotes
- Certificates, manuals, and warranty cards
- "Free gifts" or bonus items
- All items included in a bundle
What are the items that can be returned?
We accept the following items for return only if they are retuned in the same condition in which they were received, and the items should include all items that were in the original package.
We do not accept the return of CIEM products. Defective products covered under warranty could be returned for servicing, but NOT for refund. If the returned item is used, damaged, or missing any parts, or is damaged during return shipping because it wasn't packaged correctly, we might provide a partial refund to account for the loss in the item's value.
When do I need to return the items? When is the deadline?
Items can be returned within 7 days of receipt of delivery according to the online shipping tracking record.
Where do I ship the items so that I can get a refund?
If you want to ship back to us, please contact us at email@example.com.
When will I receive my refund?
In most cases, we will issue your refund within six business days after receiving and checking the returned item.
How much will I receive for a refund?
You’ll be refunded the amount you paid minus 30% of the MSRP which shall be deducted as a restocking fee. For example, if the MSRP is $100, we will refund you $70. If the item is returned without its complete original packaging (original box, foam padding etc.), additional 10% packing fee will apply.
Who can I contact, if I have questions about refunds or warranties?
If you have any questions, Please contact us at firstname.lastname@example.org.