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There are two versions of SDA-2, the standard version and the advanced version. The other parts of the two versions are the same. The high version is especially suitable for USB-based users. It is recommended to use USB-based users.

The SDA-2 decoder is a high-performance HiFi-class audio decoding amp preamplifier. It uses XMOS's latest xCORE-200 series chip as the USB Audio solution, and uses the AKM497 of the AKM third-generation DAC as the DA conversion chip, AK4118 as a digital audio input receiver chip, uses STM32 as the control of the whole machine, Xilinx's large-scale FPGA as the processing of the clock system and digital audio stream. The amp part adopts 4-way full balance design, independent discrete class A amp drive circuit; the front stage output adopts analog pre-stage design, which is not the way of digital attenuation affecting sound dynamics; has rich input and output interfaces, including standard USB2 .0 input interface, SPDIF coaxial and AES balanced input, analog XLR balanced output, analog RCA output.

PCM supports up to 384Khz, DSD uses native direct solution technology, supports up to DSD512, and all interfaces support DSD decoding.

The DAC chip adopts AKM's flagship DAC AK4497EQ; the DSD adopts the native direct solution mode. The DSD digital stream does not pass through the internal digital filter and modulator, and works in the NOS mode. The PCM can also choose to work in the NOS mode, which is in line with the HQPlayer design concept. .

SDA-2 is the first decoding amp preamp product we developed, mainly using the following four main technologies:

 1, USB part uses our first generation isolation technology: SCIT technology (Singxer capacitor isolation technique), SCIT technology is a full isolation technology (ground isolation), high-speed signal using 150Mbps isolation chip, low-speed signal using optocoupler isolation It can completely isolate the interference from the PC; the USB version of the high version can basically reach the level of the SU-1 independent digital interface.

 2, source synchronization technology and FPGA shaping technology, re-shaping the isolated I2S signal; thus eliminating the additive jitter caused by the isolation chip;

 3, The self-developed clock system uses a femtosecond crystal oscillator as the local reference clock;

 4, 4 way class A discrete amp circuit, full balanced amplification of 8 chip transistors per route.

Technical indicators:


Sample rate supported by each input interface:

PCM: 44.1KHz,48KHz,88.2KHz,96KHz,

176.4KHz,192KHz,352.8KHz,384KHz


DSD: 2.8 MHz (DSD64) - DoP,native

5.6 MHz (DSD128) - DoP,native

11.2 MHz (DSD256) - DoP,native

22.5792 MHz (DSD512) - native


Bit width: Up to 32 bit over I2S output

              Up to 24 bit over S/PDIF

Electrical standards for each interface:
1, USB input socket is a standard USB-B type female socket, USB power supply range is 4.5V-5.1V;
2, SPDIF interface input standard S / PDIF signal, input impedance is 75 ohms, AES input impedance is 110 ohms;
3, the power input is 115V/ 230V AC, and the internal 30W O-type transformer is used for power supply;
4, I2S input is LVDS level in the form of HDMI interface, compatible with SU-1 interface;

 

Analog output performance:
Output level (0dBFS):
      PCM: RCA single-ended output is 2V RMS, XLR balanced output is 4V RMS
      DSD: RCA single-ended output is 1.8V RMS, XLR balanced output is 3.6V RMS
Output impedance: 22 ohms (RCA single ended) / 44 ohms (XLR balanced)
Frequency response: 20-20kHz +/-0.2dB
Signal to noise ratio: 125dB
Distortion characteristics:
      THD+N (1kHz, 0dBFS) 0.00025% at fs=44.1Khz (PCM)
      THD+N (1kHz, 0dBFS) 0.00030% at DSD256
Dynamic response (1kHz, -60dBFS) 125dB
Left and right channel separation >125dB

Balanced output noise floor: 2.2uv RMS

Amp balance maximum output power 3480mW@30Ω, 0dBFS

Load power
30Ω 3480mW
75Ω 1640mW
150Ω 920mW
300Ω 440mW
600Ω 220mW

1. Very clean 1K FFT with only 2-5 harmonics, no high harmonics and other spurs

2. Ultra low noise floor, about 2.0uv

3.20-20k frequency response, very straight

4.Excellent distortion performance, THD+N sweep test keeps the whole frequency band below 0.00033%

5. Excellent signal to noise ratio, measured SNR at 125.6dB

6. Rapid dynamic response, DNR reaches 126DB

What is Included

SDA-2 + a USB cable + a power cord

System compatibility:

1, Windows 7, Windows 8, Windows 10; 32/64 bit, need to install a dedicated driver 2, Native MacOS 10.6 and later, using the system comes with a 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 OTG function, in general, the Android 5.0 system is supported by default, and the following 5.0 recommendations are used with a dedicated player.

The I2S interface is input using an HDMI socket:

1. LVDS differential signal with a level of 3.3V; 2. The I2S interface is compatible with multiple I2S output signal definitions, and the FPGA has built-in PCM/DSD signal automatic identification algorithm; 3. The DSD ON signal can also be defined by itself. The DSD ON signal can be input to the PIN13, 14, 15, and 16 pins of the socket. 4. The phase of PIN1-3 and PIN7-9 is adjustable, and the user can configure the phase of the two pairs of outputs through one switch. The SDA-2 can be configured with SW switches to accommodate different I2S standards.

Chassis size and packaging:

The length and width of the chassis: 262MM*220MM*46MM, excluding the height of the feet and the protruding part of the connector behind the chassis. The weight of a single machine is about 3KG. The length and width of the carton packaging: 330MM*310MM*110MM. Shipping package weight: about 3.4KG Accessories: a USB cable and a power cord

QUESTIONS & ANSWERS

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Order confirmation

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.

Stock

All orders ship from our warehouse in China within 1-3 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.

Shipping Method

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

Tax

You are responsible for paying taxes and duties . HiFiGo will be not responsible for the import tax. But we usually declare an item at a lower value, leave us a message with the desired value if you want.

Track

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.

Shipping Policy

The estimated times stated below are not guaranteed. An international package could experience delays. 

Express Shipping ( US$500 above free)

This is the fastest and our recommended option.
The estimated time of delivery is usually 3-7 Days depending on the country. Includes detailed Tracking and confirmation of delivery.

Please note:
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.

Priority Shipping  ( VAT included, US$100 above free)

Some areas we could provide priority shipping service. Includes Tracking. The estimated time of delivery for each country is outlined in the table below.

North America & Canada

1-2 Weeks


Europe (VAT paid) 

France, Germany, United Kingdom, Italy, Netherlands, Spain,Austria, Ukraine, Belgium, Croatia, Czech Republic, Denmark, Greece, Hungary, Ireland, Luxembourg, Poland, Portugal, Romania, Slovakia, Sweden, Bulgaria : 1-2 Weeks

Russia: 15-25 Days

Asia

Japan: 5-10 Days

Oceania:

Australia: 10-15 Days


Free shipping by 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. 

FAQs

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 Days.

I've received a tracking number for my order. Why is my tracking not working?

Please allow up to 24 hours for your tracking information to update. This is usually the time it takes for your order to be logged by the shipping courier after reaching the shipping facility from our warehouse.

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.
We want to make sure you're satisfied with your order and our services.
If You Have Any Questions Or Concerns, Please Contact Us so that we can help you.

 

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).

If 7 days have gone by since you received your item, unfortunately, we can’t offer you a refund or exchange.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.

Some types of goods Such as CIEMs cannot be returned. .To complete your return, we require a receipt or proof of purchase. Please do not send your purchase back to the manufacturer. 

Refunds

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds

If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next, contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at support@hifigo.com.

Sale items

Only regular priced items may be refunded, unfortunately, sale items cannot be refunded.

Exchanges 

We only replace items if they are defective or damaged. If you need to exchange it for the same item, please contact us at support@hifigo.com.

Gifts

If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.

If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.

Shipping

To return your product please contact us for an RMA. You will be responsible for paying the shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. Depending on where you live, the time it may take for your exchanged product to reach you may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item. We may advise the use of certain shipping carriers. 

 

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 invoice.

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. 

 

How can I Request a Warranty replacement or repair?

You must email our customer service support@hifigo.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.

 

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.

FAQs

Can I cancel an order? 

Once an order is placed, you have less than 24 hours to cancel it before it processes. 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 support@hifigo.com 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.

  • Cables
  • DACs
  • Amplifiers
  • UIEMs

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 support@hifigo.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.

Financial refunds can take up to 7 business days depending on your financial institution. It usually takes 3 to 5 business days for a PayPal refund to go through. Other financial refunds can take up to 7 business days depending on your financial institution. If you paid with a credit card, it may take up to 30 days to process, depending on your card provider.

Who will pay for the return Shipping fees?

You will be responsible for paying the shipping costs for returning the item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. To provide you with the best shopping experience, we will try our best to choose the best shipping method to you. If you are shipping an item over $75, you should consider using a trackable shipping service and purchasing shipping insurance. We can't guarantee that we will receive your returned item.

Who can I contact, if I have questions about refunds or warranties?

If you have any questions, Please contact us at support@hifigo.com.