Linsoul E1DA Cosmos ADC Grade A/B/C ES9822PRO Chip Analog to Digital Converter, with Aluminum Shell, OPA1612, USB-C Powered (Cosmos ADC, C)

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Linsoul E1DA Cosmos ADC Grade A/B/C ES9822PRO Chip Analog to Digital Converter, with Aluminum Shell, OPA1612, USB-C Powered (Cosmos ADC, C)

Linsoul E1DA Cosmos ADC Grade A/B/C ES9822PRO Chip Analog to Digital Converter, with Aluminum Shell, OPA1612, USB-C Powered (Cosmos ADC, C)

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Description

Compared to the typical Audio Precision graphs you see online (like ASR) which often measures at 44.1kHz, I like going the "hi-res" route and will usually show my FFTs based on a 96kHz signal. I'll usually show near infra/ultrasound on the FFT as well (down to 15Hz and up to 30kHz) just in case folks have massive subs and even super-tweeters ;-).

As you can see, Windows will list up to stereo 32/384 PCM capabilities. I didn't test this with Mac or Linux which I believe should work fine. Over the years, I've gradually improved my measurement capabilities with updates to the ADC; this being the first time I've added an analogue processor to the measurement chain. a) to do the measurement of your DAC/AMP distortions@1kHz/10kHz at <-150/-130db harmonics level, or THD+N@1kHz down to -132db. In that case, you need the Notch part of Cosmos APU. Experimental RIAA EQ FW CosmosAdc_v13_RIAA.h e x The middle of ADC volume slider activates the RIAA EQ , from summer 2023 all new units use FW with RIAA

QUESTIONS & ANSWERS

Fact is that I recently entered that world of measuring devices, and that's how I got to read your blog. I'm into older vintage devices, you know these old gears that some audiophiles praise more than any new garbage cheap Chinese stuff :-) I wanted to test that myself, and it's amusing to measure 40 years old unserviced devices. 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. Another nice option for REW is FlexASIO with 32/384 https://github.com/dechamps/FlexASIO/releases ADC stands for Analog To Digital Converter. Since computers only process digital information, they require digital input. An ADC, such as the Cosmos ADC here converts an analog input into a digital signal to process on the computer system. It is widely used by professional reviewers and audio enthusiasts to measure their audio gears. High-Performance ES9822Pro ADC Chip:- The second and biggest half of Cosmos APU is the 1/10kHz active notch filter with -30db ratio(Q about 50) at the fundamental frequency and nearly 0db at 2nd and 3rd harmonics i.e. you can simply divide by 30(or subtract 30db) the THD/THD+N result to get a normal value. Also, with REW or Arta, you can use a calibration file to normalize the notch's frequency response and observe FFT results directly. The max balanced input level is 10Vrms, it is also clamped but by the active clamp with opamp's rail voltage-1V, hence, 10ohm 0603 again may be burned like a fuse. The residual harmonics of the distortions are <-150db@1kHz or <-130db@10kHz, that's probably isn't too spectacular but still better than APx555. The residual THD+N, practically achieved one, -132db@1kHz@10Vrms(DAC+LPF approach), calculations based one is -134db but I can't confirm that so far because of can't find a perfect-zero-noise sine for that It is clear that APU is kinda a microscope for your ADC, even any laptop audio input with APU gets the ability to measure a tiny noise of DACs or LDOs, and distortion levels are perhaps lower than AP SYS2722 or even Cosmos ADC.

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. Of course, remember to keep those cables (especially unbalanced ones) nice and short and the APU/ADC measurement system away from electrically noisy devices like powerful computers when testing. The high level input is extremely useful and one of the reasons I bought this device, but the 2.5mm TRRS interface is difficult to deal with in my opinion. I would prefer to have high level input on the XLR connectors instead. Connecting a function generator, 1Vpp 1kHz, across XLR pin 1 and the connector shell, produces the above. Note that the FFT length and averaging are different, so the broadband noise levels are not comparable to the other tests. I didn't verify whether the function generator actually output 1Vpp (doubtful since the load impedance was almost zero). Measuring pin 1 and the connector shell directly at the ADC (nothing plugged in) show that they are shorted together (or at the very least have a low resistance between them); likely they are both attached to ground. In other words, injecting a signal between the two ground inputs, presumably between the chassis and signal grounds, produces something measurable; the two grounds are not connected at the input.

Blog Archive

But, why does it work this way?? Is it a Topping DAC thing or an REW thing? The levels didn't change. Notice the single USB-C connector, there's a small amber LED that blinks when in use. The blinking rate is dependent on the sample rate: 48kHz = 0.5Hz (1 blinks/2s), 96kHz = 1Hz, 192kHz = 2Hz, 384kHz = 4Hz, and the 44.1kHz family blinks slightly slower by about 10% (ratio 44.1/48 x frequency).

The Cosmos is housed in a compact metal case with rubber feet, USB Type C connector on one and dual XLR inputs on the other. Power is over USB only. Beside the USB connector is small LED that flashes slower or faster to indicate the current sample rate. Two LEDs next to the XLR inputs appear to indicate presence of a signal. The input sensitivity is set by a bank of DIP switches on the bottom of the unit. Premium Audio Components including OPA1612 OPAMPs, Susumu & Viking Resistors, Murata & Samsung COG Capacitors, Taiwanese connectors, and switches. 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 Please note that the situation for me is quite workable. I just am curious. At first, I suspected that I had some setting wrong in the bowels of Windows or maybe FlexAsio. But, then the same thing happened with a different computer running macOS, with two different software applications.

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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. You are right, my table was not readable (wrong labelling, just modified - indication of switch positions (6.7V |10V) was unnecessary). Hence this description: Well, I asked about that in the E50 review thread. A fellow by the name of Rantapossu replied. He suggested that I activate L+R in the signal generator panel of REW rather than just use one channel. Look at the difference. This is E50 > Scaler > APU > ADCiso.

First, the E1DA ADC has a very low input impedance. Even worse when you want to use it in mono mode. Recently, Ivan also posted on using the Cosmos APU+ADC for vinyl ripping;-). He is able to incorporate the RIAA EQ into the Cosmos ADC firmware (engaging the ES9822Pro's DSP) which basically turns the APU-ADC into a phono pre-amp/digitizer. Since the APU is a mono device, a stereo recording will require 2 passes and aligning the timing, or one could use 2 APUs. I was sent the custom RIAA firmware for the Cosmos ADC but haven't tried it yet. Will likely discuss this in a future blog post. The ADC is factory calibrated to a level of -0.5dB at 1kHz and 27°C. The level is best kept close to -0.5dB for best results and the ADC should be allowed 15 minutes to warm up prior to use. The Invert Second Output probably says something about the power supply regulation, although that might be crosstalk within the DAC chip, too. But, in two out of two DACs?

Please, before you decide to buy Cosmos APU, make sure that you completely understand what is it. Analog Processing Unit is the first in its kind device on the market, hence, you need to understand do you really want:



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