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Old 2nd October 2012, 09:49 AM   #51
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Default ES9023 pass-band ripple

Those with secret es9023 datasheet.
Does anyone know what are the pass-band ripple & stopband attenuation values for this dac chip?
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Old 2nd October 2012, 10:54 AM   #52
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Pass band +/- 0.005 dB at 0.454 fs (max.), - 3dB at 0.49 fs (max)
Stop band attenuation: <115 dB at 0.546 fs (min)

Datasheet is not secret, an email to Ismosys is enough.
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Last edited by jean-paul; 2nd October 2012 at 10:56 AM.
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Old 4th October 2012, 10:51 PM   #53
agdr is offline agdr  United States
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Default Just received the DAC - impressed for the price!

I just received my little package from China. I'm very impressed for the price and tiny size, IMHO. The sound is subjectively miles ahead of the built-in DAC in a Sony laptop.

Here are some photos and measurements for fun:

The first picture shows the tiny size of the DAC vs. a US quarter, a pair of AKG K550 headphones, and a PC mouse. Small!

The next two pictures show the DC offset on the two channels. 405uV and -264uV. Those tiny levels are fantastic.

Next are the AC volts rms values over the course of playing a song on the PC, max - avg - min. The AKG K550 headphones are being powered directly by the DAC here. The PC volume slider is at about half way, 48/100, which results in normal listening levels on the K550s. The range goes from about 8mV rms (min) to 57mV rms (max). The PC slider in the photo isn't clear. That blue glob at the top isn't the slider, that is an icon. Look hard right at the middle of the slider range and you will see the slider "handle".

The next 3 photos are a dB/V plot during a frequency sweep from 20Hz to 15kHz on the PC, along with photos of two of the data points during the sweep. The X axis on the plot is NOT frequency here but rather time, set up for a 1 second sampling recording, while I turned the sweep file on and off on the PC. So this plot is useless for looking at low and high end frequency rolloff, rather just roughly what happens in the middle. Which is pretty flat!

The next 3 photos are scope shots at 50Hz, 250Hz, and 15Khz from sine wave files on the PC. The scope probe is 10x (32mV DAC output, the 320mV shown on the scope screen divided by 10) and the time base is adjusted as it went to just show a few cycles on the screen. Vertical volts/div remains constant on all.
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Last edited by agdr; 4th October 2012 at 11:07 PM.
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Old 5th October 2012, 12:21 AM   #54
agdr is offline agdr  United States
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Hmmm.... one correction to my post above, after listening some more and checking settings. The HiFimeDIY DAC loaded up with the"Sabre 24/96" drivers on my Win 7 Pro installation, too, as other posts have noted. I had the HiFimeDIY DAC set at 24/44.1kHz. I just noticed that the laptop, which also has a 24/96 DAC, was set to 16/44.1 at the moment.

Changing that on-board laptop DAC to 24/44.1, and doing more of a proper A/B, I really don't hear any difference at all anymore. Not miles ahead. I probably wouldn't have even heard a difference before if it were not for the software volume slider needing to be down halfway to power the AGK K550s directly from the external DAC (loosing software bits) vs. 3/4 of the way up for the built in DAC and amp.

This isn't saying anything bad about the HiFimeDIY, but rather probably something good about the on-board sound in the Sony. Both will run at 24/44.1 and 24/96. Probably also says something about how useless subjective listening tests are! lol.

Last edited by agdr; 5th October 2012 at 12:24 AM.
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Old 28th October 2012, 10:38 AM   #55
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Default Comparison with V-Link & CS4398 system

I've been using a Musical Fidelity V-Link (asynch) USB to s/pdif converter with toslink connection to a CS4398 dac with passive Tamura output transformers for PC playback for a while. The system is very nice and clean but errs on the side of smooth and silky.

My laptop has a knackered battery so runs from the SMPS charger continuously. Prior the the battery dying it was very obvious that the noise floor of the laptop was much much higher with the charger connected. The toslink connection between USB digital interface and dac dealt was the only viable solution, as any ground connection between laptop and stereo destroyed the sound quality.

I initially connected the ES9023+TE7022 between the laptop and amp. The sound had promise but the noise floor was very high and there was a noticeable harshness to the sound. Pretty much what I would have expected given my previous experiences of ground connections from laptop to stereo.

To isolate the laptop from my playback kit, I introduced a cheap ebay ADUM4160 USB isolator (USB protection /ADUM4160 Evaluation Board /USB Isolator | eBay) and separate linear DC supply connected to the relatively clean mains supply used for my playback kit. This entirely dealt with the noise issue and removed the harshness I'd experienced previously. All sounding very nice with more dynamics and deeper, better defined bass than my usual USB interface and dac. Probably not quite the same silky smoothness although this is probably just due to the removal of the 'nicely' coloured Tamura transformers.

The next step will be to mount the USB isolator and ES9023+TE7022 dac PC inside a single chassis with external connections for USB in, DC in and line level out.

I'd heartily recommend the USB isolator for this dac.
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Old 28th October 2012, 11:29 AM   #56
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I would go with the original design of this pcb:
and cheaper than the Chinese replica in your post

ADuM4160 USB Isolator board, bare PCB and kits Circuits@Home

also better to feed the adum4160 with its own isloated power.
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Old 29th October 2012, 01:14 AM   #57
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The eBay USB isolator is cheaper once you factor in international shipping. It's also supplied with components installed. The PCB version would be great if you wanted to play around with the components though.
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Old 29th October 2012, 02:08 AM   #58
i2k92 is offline i2k92  Indonesia
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They have a new model out : Hifimediy Sabre COAX/OPTICAL DAC. ES9023 + CS8416 230V

This time with onboard power supply, coax & optical inputs. Unfortunately, they decided to use CS8416, not higher quality WM8805 as the digital input chip.
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Old 29th October 2012, 09:54 AM   #59
alkasar is offline alkasar  France
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Quote:
Originally Posted by i2k92 View Post
they decided to use CS8416, not higher quality WM8805 as the digital input chip.
It's not a bad choice. CS8416 is 24/192 in hardware mode. wm8805 is limited to 24/96.
wm8805 has supposely better jitter, but WM does not measure jitter the same way. Where is the truth ? Frankly speaking, i doubt any one can hear or even measure the receiver difference.

IMHO, the dac chip is far more important than the receiver. The Sabre ES9023 is an impressive dac
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Old 29th October 2012, 01:23 PM   #60
i2k92 is offline i2k92  Indonesia
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Quote:
Originally Posted by alkasar View Post
It's not a bad choice. CS8416 is 24/192 in hardware mode. wm8805 is limited to 24/96.
wm8805 has supposely better jitter, but WM does not measure jitter the same way. Where is the truth ? Frankly speaking, i doubt any one can hear or even measure the receiver difference.

IMHO, the dac chip is far more important than the receiver. The Sabre ES9023 is an impressive dac
I just don't understand why they choose CS8416 while they use WM8805 for the CS4398 DAC ( which I have & c'est pas mal du tout) and new version of DDX320 amp (which they mention as upgrade from CS8416 on the previous problematic version).
But are you sure that WM8805 only accept 24/96 as hifimediy mention that their CS4398 direct DAC supports up to 24/192 ? That thing uses WM8805.

Merci bcp
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