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E1DA Cosmos ADC Hi-Precision Analog To Digital Converter For Audio Testing

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SKU HG0021930CNCosmos

Cosmos ADC


Bundle 1 is Grade C.


Bundle 2 is Grade B.


Bundle 3 is Grade A.


>Premium ES9822 Pro ADC chip.

>Capable of measuring low THD+N signals.

>Can be used to Rip high-resolution Vinyl signals.

>Premium Audio Components including OPA1612 OPAMPs, Susumu & Viking Resistors, Murata & Samsung COG Capacitors, Taiwanese connectors, and switches.

>Rich sandblasted finish with Black Anodized Aluminum.

Technical Specifications:-

>Input: Comtrue CT7601CR Custom FW USB Bridge, XLR L/R(FDA) up to 10Vrms.

>Aux 2.5mm jack up to 43Vrms.

>Output: USB Type-C, PCM up to 32-Bit/384kHz.

>Power Input: USB Type-C, <250mA Current.

>Latency: 5mS@192kHz ASIO4ALL REW.

>Input Range: 1.7Vrms 640Ω, 2.7Vrms 1kΩ, 3.5Vrms 1.3kΩ, 4.5Vrms 1.66kΩ, 6.7Vrms 2.46kΩ, 7.6Vrms 2.82kΩ, 8.5Vrms 3.12kΩ, 10Vrms 3.48kΩ, 43Vrms 13.6kΩ.

Note: Unbalanced impedance about 30% less.

>Frequency Response Range: 5Hz-180kHz @ 32Bit/384kHz.

>SNR: DR@Mono. 127+/-1dB.

>THD+N: 0.00007% @ 1kHz, @-5dBFS, SR 48kHz, BW 20Hz-20kHz.

>SINAD: >123dB.

>Crosstalk: <-140dB@1kHz.

E1DA Cosmos ADC is a high-performance Analog-to-Digital Converter that can be used for measurements of ultra-low THD+N signals or calibrating Desktop DAC's for minimum distortions. E1DA has professionally designed the Cosmos ADC with premium ESS Sabre ADC Chip. It can also be used to measure the performance of high-fidelity desktop DAC systems with great precision.

High-Performance ADC Chip From Sabre Technologies:-

E1DA Cosmos ADC is equipped with an ES9822Pro ADC chip. It is a top-tier 2-channel Analog-to-Digital converter chip that helps one measure high-resolution audio devices with lower THD+N ratings. You can use it to record Vinyl signals and rip your favorite music off your Vinyl discs.

What is an ADC:-

A computer system only understands digital signal. To use our favorite headphones to their full potential we use DACs(Digital to Analog Converters), to provide signal to a computer system we need an ADC(Analog-to-Digital converter). They are important to measure HiFi audio systems with lower distortion ratings. These are widely used by professional audio reviewers and tech bloggers to measure their rigs precisely.

High-Quality Audio Components:-

E1DA Cosmos ADC is composed of high-quality audiophile-grade components on its audio motherboard. It is designed to get precise measurements or rip high-quality audio signals. Apart from a premium Sabre ADC chip, it benefits from Susumu & Viking Resistors, Samsung COG Capacitors, Taiwanese switches, and more for high-quality performance.

Sandblasted Black Anodized Aluminum Alloy Chassis:-

Cosmos ADC has a well-finished look with black anodized aluminum alloy chassis. It has a smooth sandblasted finish for a rich and premium look with the device.





Device Purpose/Marketing Target: Ultra-low THD+N Analog to PCM Digital Converter For Audio Measurement, E1DA 9038S/D DACs users, DIYers, Audio Tech Bloggers-reviewers


Materials: Sandblasted/Black Anodized aluminum/laser mark/ES9822Pro/OPA1612

                   Susumu, Viking Resistors, Murata, Samsung C0G caps, Taiwanese Connectors/Switches


Dimensions: 104x61x39mm

Weight: 157g

Power: USB-C +5V Rail, <250mA Current

Input: USB bridge Comtrue CT7601CR Custom FW

            XLR L/R (FDA) up to 10Vrms

            AUX 2.5mm Jack up to 43Vrms

Output:  USB-C, PCM up to 32b/384kHz


Latency:  5mS@192k ASIO4ALL REW measured as a physical delay/2

                 from ADC input to the 9038D output

Input Ranges/Impedance: 

  • 1.7Vrms  640Ω

  • 2.7Vrms 1kΩ

  • 3.5Vrms 1.3kΩ

  • 4.5Vrms 1.66kΩ

  • 6.7Vrms 2.46kΩ

  • 7.6Vrms 2.82kΩ

  • 8.5Vrms 3.12kΩ

  • 10Vrms  3.48kΩ

Note: Unbalanced impedance about 30% less.


Frequency Response: 5-180+kHz @ 32b/384kHz, depends on the interpolation filter setting

SNR=DR@MONO: 128-129db(A) Grade-A,

                                127+/-1db(A) Grade-B,

                                  <126db(A) Grade-C >125db(A)

                                STEREO mode has 3db worse SNR/DR


THD+N@1kHz@-.5dbFS SR48kHz BW 20-20kHz   .00007%, SINAD >123db typical for Grade-A, 122db Grade-B

THD@1kHz@-.5dbFS BW 22-22kHz   <.00003%(.3-.2PPM) typical for 32b/48kHz all harmonics level -135-145db


Crosstalk: < -140db@1kHz 


The Windows driver is here.

FW tools are here

Cosmos_Tweak Windows app


Let me say you

something about it.


 I have to apologize for my non-native English, and non-literary style. I just want shortly and not too boring to describe what I know about that ADC.


A) We offered our 9038S/D DACs users to control the distortions performance of those DACs with the Tweak9038 Android APP.


B) Who says A must say B...

    We prepared an instrument to test that performance accurately.


You can calibrate your 9038S/D DAC for the minimum distortions at the particular headphones the DAC loaded, or measure non-E1DA DACs THD/THD+N to see how far was a “golden sample”, measured by some blogger, from your particular DAC ;) Oh, a lot of fun around the high-performance audio-analyzer on your palm! Especially if you are a perfectionist as I am. I remember I bought a Swiss spectrophotometer for my DSLR, both were the same price. So, there is the same situation regarding audio performance, I offer you to test and calibrate distortions of your E1DA DACs by yourself.


Of course, Cosmos ADC can be used as the finest vinyl ripping ADC or as a studio recording interface but I think pretty much any ADC may rip vinyl(just 70db of the 125db dynamic range needed) or record a mic's signal, where 16bits resolution, I guess is enough. In other words, Cosmos ADC is for sure breakthrough in audio measurement which becomes so attractively inexpensive and top-precise at the same time but regarding the vinyl ripping/studio recording, I don't think if you may notice the difference between an ADC with 10x times worse distortions VS Cosmos ADC.I don't insist I'm right, fortunately, 10x times fewer distortions Cosmos ADC cost >10x times less than "top brand" ADCs, and you can buy it, try and report back in our discord channelabout how I was right/wrong.



Cosmos ADC is a plain USB-C powered Analog to Digital Converter to PCM 32bits/44.1-384kHz with extremely low distortions and noise, which the first time in history makes the ADC suitable for the THD+N measurement at levels lower than audio analyzers $20000 price range. I agree, it sounds suspicious but what can we do with the tech progress? Cosmos ADC uses the ES9822Pro chip released by ESS Technology. Inc. less than 1 year ago. The chip is positioned as "The Sabre ES9822 PRO is the world’s highest performance 32-bit analog-to-digital (A/D) converter targeted for professional audio applications such as recording systems, mixer consoles and digital audio workstations (DAW), test equipment, instruments". Sounds too bright? Actually, it's a true statement, at least with formal specs like THD+N ESS chip overtakes competitors for 7-10db or so, and at the same time outperforms my old analyzer AP SYS2*** for 2db(typical for Cosmos ADC grade-B in mono mode).


Regarding the grading, each Cosmos ADC unit is individually calibrated for the minimal distortions at level -0.5dbfs 1kHz with the typical THD <0.00003% or to say shorter .3-.2PPM. The typical level of 2nd, 3rd, and other harmonics between -135.. -145db for all grades from A to C. Grades are only about the noise, and each unit has a grade mark on the left side of the front panel. In most cases, SNR/Dynamic_Range in the MONO mode is within 127+/-1db(A) it is grade-B Cosmos ADC. Less than 126db(A) means grade-C, from 128db(A) and better grade-A, 129db(A) and better grade-0(very rare grade, and probably redundant, just in case). The MONO mode improves the SNR/DR for 3db, so a grade-A unit typically has SNR 125db(A) in STEREO mode. MONO/STEREO modes are switchable by the UAC2 volume commands, for example, if your Windows volume slider position is less than 50%(0 to 49%) the device works as 2 channel ADC, if more than 50% it is a MONO ADC with summed Left+Right inputs mapped on the Left channel(Right input is always mapped to the Right channel). In the MONO mode, both channels need to be tied together L+ to R+, L- to L-.



The free FFT software list we recommend use is quite short:


1) Arta https://www.artalabs.hr/download.htm should be used with 20-20kHz BW limit as a fake mic-response file https://drive.google.com/file/d/1vEa4OPBMfOGEmuo_RLf3nT_xyUPwl6LU/view?usp=sharing. It is a free app but to save files need to pay $100, I don't remember if I had ever needed to save something there. Arta correctly calculates SNR, THD, THD+N, but as I noticed incorrect IMD.


2) REW https://www.roomeqwizard.com/ free for a single-channel version, that's enough for most cases. Not all versions correctly work with THD+N but RC9 at least is ok. The known issue is ASIO only supported, ASIO4ALL works ok but up to 192K. Sometimes ASIO4ALL driver can occupy Windows 10 volume slider after use, which makes it impossible to change the MONO/STEREO mode of ADC.

Most FFT software may correctly show the levels of the harmonics but incorrectly calculate THD+N etc be aware. Please watch the tutorial about Arta using with Cosmos and 9038S/D DACs https://youtu.be/eguKMNZ-XJw



Also, you have a free E1DA Cosmos Tweak Windows app.This app lets you control the distortions harmonics level, interpolation filters, and ADC's integrator settings. The harmonics control is similar to our Tweak9038 Android APP for DACs but without a volume dependency. All ADC units are calibrated before selling, so it is a good idea do not change Cosmos Tweak Windows app's options without copying calibrated values before. I.e. after you plug the ADC, run TweakCosmosQT.exe, and click on the [Connect&Read] button to see the calibrated values of THD compensation(THD ADC1/3: 2nd, 3rd as the Left ch and THD ADC2/4: 2nd, 3rd as the Right ch), and ADC_INT_SEL for ADC1-4(usually, all parameters there = 11). Please write down all those parameters or screen it shot to recall if needed. To make sure if calibrated values are correct, click the [Connect&Read] button again to see that the app is connected to the hardware, do not lose the calibration values! Typical 2nd compensation values are 0+/-5, 3rd from -7 to -15. Why you may need that app? In case, if you have a precise sine-wave source with surely ultra-low distortions(AP analyzer, custom -150db clean 1kHz oscillator, or Cosmos DAC), you can re-calibrate Cosmos ADC distortions. For example, AP analyzers require regular annual re-calibration, hence, such a precise ADC as Cosmos needs to be re-calibrated for THD as well. ADC_INT_SEL parameters may improve the SNR of ADC. The slider 2ch MODE/1ch MODE does switch STEREO/MONO mode of ADC, the same way as a volume slider. You can set any of the 8 interpolation filters you wish, the default one is Linear phase Apodizing. If you care about latency, your choice is Min phase filters. All parameters changing are memorized automatically.


Cosmos ADC has a hidden on its bottom side the DIP-switch attenuator for 8 ranges of sensitivity 1.7-10Vrms. Each range has a different input impedance due to the ADC has only bare FDA inputs no high-impedance buffers to keep distortions and noise specs as high as possible. That fact needs to keep in mind if you gonna measure some old vintage stuff with relatively high output impedance. Modern DACs and DACs+HPA as E1DA 9038S/D for sure no problem. Cosmos ADC has 2 FDA XLR inputs 1.7-10Vrms, and a tiny 2.5mm 43Vrms AUX input as a gift to DIYers who like to play with power amps(do not plug/unplug that jack when the amp is On!). All inputs are AC coupled(-2V to +12v DC allowed) Fully Differential aka balanced and could be used with balanced/unbalanced outputs in any combinations i.e. doesn't matter +IN to GND or -IN to GND or IN+ to the OUT+ or to OUT-, the same for IN- etc.


The rear panel contains a USB-C socket and an the orange status LED to indicate the sample rate by LED's flashing frequency(48k 1 blink per 2S, 96k 1 blink per 1S, 192k 2 blinks per second etc). I saw on reddit.com complained about LED flashing. Anyone has "am I boomer?" psychological complex, who feels the LED blinking is too much 1960th style, please request in our discord channel for the Boomer_free Firmware with no LED flashing + how2reflash instructions - you are welcome )

LEDs on the front panel work as a "Signal" indication - green if the STEREO mode and the input > -30dbfs, or blue in the MONO mode. A "Clipping" red-LEDs indicate that the input level reached 0dbfs. i.e. 80s style as I believe ;)


Optional Accessories: 1) Load Board for 20USD 2). A pair of XLR Cables for 20USD


1) Cosmos Load gold-plated board, is a dummy load to test headphones-outputs, balanced(DIP-switch 11&12 Off) and unbalanced(DIP-switch 11&12 On). Each of the two channels could be independently configured by the DIP-switch for 32 variants of the resistance value 10-300ohm + no load. The board has 2 plugs 3.5mm(if DUT has unbalanced headphones output) and 2.5mm(if balanced), you need to install the plug into a Device Under Test(DUT). Also, the board has 3.5mm and 2.5mm jacks, you can use these for real headphones as a load. In that case, the resistance DIP-switch needs to be set as no_load to measure the distortions on the particular cans. The balanced side has 4 outputs L+, L-, R+, R-, and unbalanced 4 outputs L+, L-, R+, R-, please use hook-clamps(red-POS and white-NEG Inputs) of the XLR probe cable to tie the Load board to the ADC. The GND crocodile sometimes makes sense to tie to the USB-C shield of a DUT.


2) To connect Cosmos ADC to the Load board we prepared the XLR probe cable. It is a 1/2m short a decent quality shielded cable(a lot of copper!) with two hook-clamps(red-POS and white-NEG Inputs) and one crocodile-clamp(GND) on the DUT end.


So far I have mentioned pretty much Pros only, let me talk about Cons too.


1) USB-C is a tiny modern socket with < 0.3mm width golden pins, UAC2 utilized in that ADC uses a bulk transfer protocol without bad-block repeat requests, unlike the data-storage transfer. Hence, if you gonna plug/unplug the USB-C cable everyday, you'll start to complain about an unreliable USB-C connection next 3 months. A good idea to use USB A2C cable and plug/unplug its A-end on the PC side.


2) Each ADC unit is individually calibrated at a particular level -.5dbfs, and 1kHz frequency. For the best precision of measurements, you also need to keep the input level close to that level. THD across the 0-30dbfs range will be within -120db=1PPM it is not bad but the best is -.5db and most of the samples have there .2PPM. The same regarding the frequency, Cosmos ADC calibrated at 1kHz because it is a standard THD+N test in the audio industry. If you need to measure 10kHz THD better to re-calibrate the ADC with a reference 10kHz sine source first(see above E1DA Cosmos Tweak app) or enjoy 1-1.5PPM of THD.


3) The calibration is performed at the particular ambient temperature 27C, if your environment is seriously colder/hotter the THD performance is not guaranteed. Avery time the unit needs to be warmed up during 15-20min before use.


4) The front end of Cosmos ADC has a very wide frequency response up to 185-190kHz and using that in 44/48k Sampling Rate you may notice some aliasing artifacts due to DAC's HF noise not filtered out well. Try to switch SR to 96-384k to make sure if some strange FFT peak you found is real.


5) To preserve the original ESS ADC chip performance as high as possible and keeping the cost under tight control, the ADC utilized a direct FDA front end with different input impedance across the gain ranges. It makes voltage drops at the DUT outputs if one has a relatively high output impedance and minimal ADC input range selected(1.7V, see the specs), I did mention that above and have just repeat it again.



Tech Plots and Hints


12kHz "Jitter Test" E1DA 9038SG3 to Cosmos ADC


Left CH 1kHz -.5dbfs, Right CH -152db of Crosstalk


FYI ;)


Hint: How to use Cosmos ADC, load-board, and 9038SG3 to measure distortions

on your headphones with FFT Arta/REW etc. Use Tweak9038 Android APP

to adjust 2nd/3rd harmonics levels.


Hint: How to use Cosmos ADC, load-board, and 9038D to measure distortions

on your headphones with FFT Arta/REW etc. Use Tweak9038 Android APP

to adjust 2nd/3rd harmonics levels.


24/48 Stereo Mode Linearity >133db+/-.5db





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There may be a transaction fee deducted by your bank when the order is canceled or refunded fully or partially, HiFiGo is not responsible for this if your bank charges 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 items listed below: 

Desktop DAC/AMPs IEMs and Dongles:  1 years warranty

Cables and Adapters: 3 months warranty

 (excluding carrying cases, ear tips, and other accessories)

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 that is not intended. There are no warranties other than expressly set forth herein. 


  • Damage due to user negligence, accidents, disassembly, 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 the 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 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 attorney's fee and costs.


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 the problems that you encountered with as much 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 7 days 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 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 an exchange service if the items are in the following conditions. (*Except Non-refundable & Non-exchangeable items)

  • Products must in “Good Condition” with no damage 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 for canceling, 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 returned 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 and custom cables. 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 if you receive a damaged, different or unusable item.

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.), an 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 support@hifigo.com.