Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 228 - diyAudio
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Old 26th January 2013, 06:54 PM   #2271
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Quote:
Originally Posted by Blitz View Post
Found the sticker, it was under the board...and as I have connected the board with everything it was not easy to find...3.3, yes.

So it was plug and play without changing anything...easy.

Only question left: I put the jumper between TP3 and TP4...as well with the 22.x clock. Made nice music...but according to your guide this was wrong. TP4/TP5 would have been right, correct ? So, I should change the TP3/4 to TP4/5 with 22.x and see how this sounds ?

By the way: The Crystek 22.x with TP3/4 sounds completely different than the Tentlabs 45.x. The crystek much like a Direct heated Triode...very rich tonality, very fluent and liquid sound. The Tentlabs sounds like a heavy-feedback transistor amp based on bi-polars in comparison. Clean, controlled, but technical sounding. Unbelievable how much a clock can do.
Firmware upgraded after hardware, so please don't mind about the marks on the PCB. Please follow the document with 100% to make sure every setting is correct.

Jumpers are just telling the processor how to swich Fs, without changing anything to clocks, so will not affect sound.

Ian
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Last edited by iancanada; 26th January 2013 at 06:58 PM.
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Old 26th January 2013, 08:57 PM   #2272
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I changed the jumper to what the manual says...instead of tp3/4 Tp4/5...not sure if this changed the sound, but for sure it changed the frequency the board shows. Before it was correct, now the board shows half of the frequency, so a 96khz recording now is 48khz in the leds of fifo board...so, is this intended or back to tp3/4 ?
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Old 26th January 2013, 09:27 PM   #2273
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Quote:
Originally Posted by Blitz View Post
I changed the jumper to what the manual says...instead of tp3/4 Tp4/5...not sure if this changed the sound, but for sure it changed the frequency the board shows. Before it was correct, now the board shows half of the frequency, so a 96khz recording now is 48khz in the leds of fifo board...so, is this intended or back to tp3/4 ?
For double speed mode, Yes.

Real frequency decided by the XO your are using, not the jumper.

LEDs show different for normal and double frequency.Please read the pdf file for more detials.

Ian
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Old 26th January 2013, 10:53 PM   #2274
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Thanks for your patience...reading helps...

so, if I get it right....for the 22.x both Settings work. Difference is

TP3/4: The Dual Clock module works in normal mode, therefore the speed LeDs are showing the right speed as well.
TP4/5: The module works in Dual speed mode. Not needed for 22.x clocks, but for 45.x, but neverthelss possible.

Right ?
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Old 27th January 2013, 12:49 AM   #2275
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Originally Posted by Blitz View Post
Thanks for your patience...reading helps...

so, if I get it right....for the 22.x both Settings work. Difference is

TP3/4: The Dual Clock module works in normal mode, therefore the speed LeDs are showing the right speed as well.
TP4/5: The module works in Dual speed mode. Not needed for 22.x clocks, but for 45.x, but neverthelss possible.

Right ?
You got the point, YES!


Ian
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Old 27th January 2013, 03:24 AM   #2276
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The tonality is warmer, richer, less technical. The positioning right and left is much better, but maybe a little flatter, not so deep space. Flow of music is more "natural" and liquid. Clearly it goes in the right direction.

What I currently feel on the other handside is: A very small loss of dynamics and attack. A little bit of "air" and space seems to be gone. Somehow it reminds me of some compression-effects I had when using power-line-filters compared to no filters. It plays now like a very controlled, civilized musician vs Joe Coecker before (a little rough and wrong before, but really dynamic). Strange.

Very close to my subjective impressions. What i find the only subjective downside is the reduced back to front perception, everything else seems just fine.

Did you try at all the kit clocks?

It seems with reasonably high quality I2S input, improvements cannot be taken for granted even if the underlying principles of operation are so compelling. Cabling, ps noise, etc probably become the real bottleneck.

Have you experimented at all with the USB cable since using Ian's kit? One would expect this should now become inaudible, right? And also fine tuning OS and software for minimum latency. What about your Sotm card, have you tried using a standard USB port?
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Old 27th January 2013, 08:50 AM   #2277
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Originally Posted by analog_sa View Post
.....

Have you experimented at all with the USB cable since using Ian's kit? One would expect this should now become inaudible, right? And also fine tuning OS and software for minimum latency. What about your Sotm card, have you tried using a standard USB port?
Shouldn't we try to stay a little science/logic based...

/
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Old 27th January 2013, 10:18 AM   #2278
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Originally Posted by analog_sa View Post
Did you try at all the kit clocks?

It seems with reasonably high quality I2S input, improvements cannot be taken for granted even if the underlying principles of operation are so compelling. Cabling, ps noise, etc probably become the real bottleneck.

Have you experimented at all with the USB cable since using Ian's kit? One would expect this should now become inaudible, right? And also fine tuning OS and software for minimum latency. What about your Sotm card, have you tried using a standard USB port?
I have currently not yet started with FIFO in the chain to swap stuff and learn. It will be interesting as both can happen: The chain is less sensitive now or more sensitive now...question is how much FIFO "corrects" or if it is more like a magnifier which shows now with a higher level of clarity what is going on.

BEFORE FIFO:

The Sotm USB was very audible. Much more liquid and tonality rich than the normal USB-Port from any motherboard I tried (and I tried a lot). It is worth the money. With normal Motherboards in any case, but even with an Alix-Board.

On USB-Cable, I used normal Kimber-Cable CU. Nevertheless I plan to build my own cable, shorten it to 20cm and make it Ground and Data only and Silver-Cable. You can buy these cable for 500 Euro or build them yourself for 20 Euro.

I will for sure try as well silver-cable for connecting the FIFO with WAVEIO and BIII.

Latency changes where very audible already before, I played around with the CPU and Ram-Latencies and change the switch to the Netgear GS108E which is a big improvement, especially in terms of reliable delivery of data stream for the HD stuff. NO DROP OUTs anymore since this one takes care of the distribution !!! As well a nice sonic improvement for free.

MPDPUP is as well mandatory, much more musical than any Windows stuff, and I tried a lot. (CMP, Jrover, Foobar, Jplay etcetc; Hardcore tweaking of Windows XP, Vista,7). As well the Linux-Tweaks suggested in the MPDPUP-Threat are audible.

Since the FIFO I have now a slight, small hum in my left speaker and I need to fix this first, we need a real quiet system to do these kind of evals.

Outlook:

- I will get from Ed the 44/49 clocks and will compare.
- Battery supply is in Prep as well.
- If I have this together, maybe Ian's S570 is already in the house and we will see.
- Ackodac is ordered to do a comparison to the BIII as well and have the U-Fl cable game to try.
- Moving from Async to Sync with Ackodac and S571
- AckoDac will be powered by Paul Hynes-Regs or
- Salas Shunt-Regs are in the house since this week and
- the D1, the Sen and the CCDA based on 12B4 are in process to be build.

Those three outputstages will require rebuilding the power-amp to fully balance, no phase-splitter anymore.
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Old 27th January 2013, 10:26 AM   #2279
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OK, I thought you had already Ians fifo...

Still, reducing latency in the computer... You know you will get up to 1/2 second with the fifo?

/
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Old 27th January 2013, 11:56 AM   #2280
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The fifo is now working since a week...I have not played with the other variables so far, just starting now to play with clocks and stuff
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