exaU2I - Multi-Channel Asynchronous USB to I2S Interface

[Bunpei]

Originally Posted by RayCtech

I am playing (have been doing that for a good period of time already) with isolation of USB (480MB/s) with both exaU2I and other USB implementations.

Oh, that's great!
You must have completed the work quoted below that had required exa065's help.

Originally Posted by RayCtech

I tweaked some of the component values and now the galvanic isolation of the USB works reliable, but some more work are needed to perfect the solution.
I have asked exa065 for his help as the component values on the exaU2I and the programming of the ASIO driver together with the component values of the galvanic isolation can for sure be optimized as my implementation are not fine tuned.
...
The differences are easy to verify in all resolutions from 44.1k/16bit flac and up to 384k/32bit upsampled DXD...

However, it's pity that no one other than you can reproduce the way you have established in-house.

Bunpei

[RayCtech]

Originally Posted by Bunpei

Oh, that's great!

However, it's pity that no one other than you can reproduce the way you have established in-house.

USB isolation works..
SATA / eSATA and I2S isolation works..
The method I now use (there have been some technological improvements) do not add jitter or noise, but actually reduces lower frequency phase noise etc..
The next I now will work on are isolation of clocks (master clocks) as I may be able to reduce the low frequency noise / phase noise by more than 60dB at 10kHz and more than 100dB at 10Hz if the "isolation" performs as expected.

I will assemble some few USB, I2S and master clock isolation modules and let some hardcore DIYers evaluate the performance.
As isolation can easily be switched on / off I can also implement a remote control to do this switching in realtime...

[barrows]

USB isolation is very exciting news. I hope we can hear more about your approach (at DIYaudio.com) in a dedicated thread.
Exa, sorry for the slightly off topic comment.

[RayCtech]

Originally Posted by barrows

USB isolation is very exciting news. I hope we can hear more about your approach (at DIYaudio.com) in a dedicated thread.
Exa, sorry for the slightly off topic comment.

There will be no more dedicated threads regarding any of my ideas

Exa065 - this will be my last OT posting in your threads...

As this may be my last posting on diyAudio.com except in those threads I have started myself I will use the opportunity to say goodbye to all the great personalities I have encountered here

[NicMac]

Originally Posted by RayCtech

I have isolated USB connections with copper wire, silver wire and pure gold wire.
Isolated USB with pure gold wire insulated with pure silk are by far the best sounding.
These observations are based on my setup where the internal cables in the DAC are pure gold with air as isolation, the interconnects to the power amplifier are pure gold with pure silk isolation, the PCB´s are gold plated in the whole system, the speaker cables are a combination of pure silver and pure gold - isolated with pure silk.

Why do you think you find that gold sounds "far better" better than copper or silver, when it is actually a worse conductor than both?

[exa065]

People, please use this thread as a place to promote the exaU2I cause.

[exa065]

Originally Posted by NicMac

Why do you think you find that gold sounds "far better" better than copper or silver, when it is actually a worse conductor than both?

NicMac, disclosing a private message is a very dishonorable thing. You are not welcome here anymore.

[Bunpei]

May I ask about a conventional channel assignment rule on DSD playback?

ExaU2I supports a DSD play. The connection diagram for DSD signal output is shown on this ExaDevices web page.
Native dsd playback from WinXP PC using the exaU2I

The notion, "DSD data 1" and "DSD data 2", is used here.
When a stereo play is applied, which channel is to be assigned to "Left" according to a conventional rule?

[exa065]

Originally Posted by Bunpei

May I ask about a conventional channel assignment rule on DSD playback?

ExaU2I supports a DSD play. The connection diagram for DSD signal output is shown on this ExaDevices web page.
Native dsd playback from WinXP PC using the exaU2I

The notion, "DSD data 1" and "DSD data 2", is used here.
When a stereo play is applied, which channel is to be assigned to "Left" according to a conventional rule?

Sorry, I don't understand the issue here. Can you explain?

[exa065]

Hello exaU2I Owners!

This is a call to showcase your projects for the opportunity to win an exaU2I version 2!

Post pictures of your project and explain your goals and results on the exaU2I Projects Gallery. The best project, as judged by the exaDevices Team (with the help of the DIY collective), will be declared the winner of a free exaU2I version 2. The contest closes at the end of February. Only DIY, non-commercial contestants are eligible to compete.

For those of you that don't own an exaU2I, but are interested in competing, we are offering a $100 discount on the original exaU2I.

-exa065