XMOS DSD 384 kHz / 32bit USB

dhbiker · 2013-12-17 2:05 pm

Luca72c said:
Sorry for the late reply, i tested my friend's XMOS+PCM5102 combination just this morning in my hifi system. The test DAC was totally USB-powered.
I have to say i don't agree with dhbiker: to my ears, my Xonar STX with 49990 opamps sound is clearly more convincing. ...

Hi there

LME49990 has different sound signature than LME49720 and also it depends on the system you listen on.

that's why you will never get the "true" information you want, also we humans hear sound differently from each other/ have different taste

anyways not trying to start anything just my 2 cents on your quote

Luca72c · 2013-12-17 2:54 pm

dhbiker said:
Hi there

LME49990 has different sound signature than LME49720 and also it depends on the system you listen on.

that's why you will never get the "true" information you want, also we humans hear sound differently from each other/ have different taste

anyways not trying to start anything just my 2 cents on your quote

That's OK, i just wanted to share my experience

Scuba · 2013-12-19 4:04 pm

Hello,

1) Is it possible to use an USB cable without the +5V wire if we are powering the boards externally ?
2) Is it possible to separate the supply for the reclocker/oscillators from the supply of the DAC?

iperv · 2013-12-20 6:14 pm

low latency button trouble

Hi all,

I bought a Joro's combo, xmos + PCM5102.
I don't understand how I can change between FIR and IIR philter.
I know that standard state is FIR filter, and there is a 'button' to change the state.
I don't understand how to use this button (there are two holes, it is not really a button), nor how I can see wich status (FIR/IIR) is now running. Is there a led?

Can someone help me?
Tia.

Scuba · 2013-12-20 9:33 pm

Well, it seems that it has the possibility to use 2 filters. http://www.jlsounds.com/uploads/PCM5102_board.pdf

Probably you could use a pushbutton connected to the correspondent header (marked "Lat"). If it is like the AK4396 board, pushing the button should toggle between the two filters.

cmiu007 · 2013-12-21 10:25 am

iperv said:
I know that standard state is FIR filter, and there is a 'button' to change the state.
I don't understand how to use this button (there are two holes, it is not really a button), nor how I can see wich status (FIR/IIR) is now running. Is there a led?

switch = is located near configuration jumpers, on the other side (up face)
Led = is marked F near 1 to 4 pins

use the picture from first page of AK4396 board.

If you push one time the switch the led will go off and the filters are changed.

If you long push the switch the DAC will go to sleep mode and the led will blink.

ghiglie · 2013-12-21 2:30 pm

Hi there,
joro's combo just arrived, with both DACs.

I can play superlatively HiRes FLAC, but I can't play DSF files (no sound and no LED on board). I am missing something in my configuration. I know it's OT, can someone point me where I could get some info?
Thanks,

Marco

Scuba · 2013-12-21 4:10 pm

What player and which OS are you using?

I am on OSX. Both Audirvana and Pure Music are working perfectly. No drivers are required.

On Windows, you must install the XMOS drivers from here: http://www.jlsounds.com/uploads/XMOS-Stereo-USB-Audio-Class2-Driver-2023(v2.15).rar . (it is mandatory, as it contains also the ASIO driver).
After that, you can use the guide from audiostream: How To Play a DSD File: using Foobar2000 | AudioStream .

iperv · 2013-12-21 6:28 pm

Scuba said:
Well, it seems that it has the possibility to use 2 filters. http://www.jlsounds.com/uploads/PCM5102_board.pdf

Probably you could use a pushbutton connected to the correspondent header (marked "Lat"). If it is like the AK4396 board, pushing the button should toggle between the two filters.

Ok.
Can you please post a link or an example of a right pushbutton?

Thanks.

EDIT: something like this?

www.pololu.com/product/1400

iperv · 2013-12-21 6:30 pm

cmiu007 said:
switch = is located near configuration jumpers, on the other side (up face)
Led = is marked F near 1 to 4 pins

use the picture from first page of AK4396 board.

If you push one time the switch the led will go off and the filters are changed.

If you long push the switch the DAC will go to sleep mode and the led will blink.

There's no switch, my board is the pcm5102 one.

iperv · 2013-12-21 6:36 pm

ghiglie said:
Hi there,
joro's combo just arrived, with both DACs.

I can play superlatively HiRes FLAC, but I can't play DSF files (no sound and no LED on board). I am missing something in my configuration. I know it's OT, can someone point me where I could get some info?
Thanks,

Marco

Ciao Marco,

if you speak about pcm5102, you can't play DSD file.
You only can with ak dac.

You can always use a player like jriver to play dsd to flac on the fly.

Scuba · 2013-12-21 6:59 pm

iperv said:
Ok.
Can you please post a link or an example of a right pushbutton?

Thanks.

EDIT: something like this?

Pololu - Mini Pushbutton Switch: PCB-Mount, 2-Pin, SPST, 50mA (5-Pack)

Yes, that should work fine.

ghiglie · 2013-12-21 11:41 pm

Scuba said:
What player and which OS are you using?

I am on OSX. Both Audirvana and Pure Music are working perfectly. No drivers are required.

On Windows, you must install the XMOS drivers from here: http://www.jlsounds.com/uploads/XMOS-Stereo-USB-Audio-Class2-Driver-2023(v2.15).rar . (it is mandatory, as it contains also the ASIO driver).
After that, you can use the guide from audiostream: How To Play a DSD File: using Foobar2000 | AudioStream .

I'm using foobar on Win8.1 , drivers installed , and I've found that guide while I was trying some DSF file. Maybe I didn't follow it right, I'll try tomorrow night with a foobar clean install.

iperv said:
Ciao Marco,

if you speak about pcm5102, you can't play DSD file.
You only can with ak dac.

You can always use a player like jriver to play dsd to flac on the fly.

Grazie! I've tried them with both boards (I was verifying all was ok on arrival), but I know it should work just with the AKM. JRiver...mmm...

Anyway it looks like a sw local problem: even AudioGate plays them in PCM at 192.

ghiglie · 2013-12-22 11:24 pm

DSD64 led lightens up with JPlay.
Love you guys! (but Joro a bit more).

Now, let's build up a nice supply for it and have it boxed.

Scuba · 2013-12-22 11:38 pm

I have powered the AK4396 board form a hot-rodded Salas shunt and the improvement is very big. A second one is in the works, to power the XMOS

.

joro_s · 2013-12-23 4:01 pm

Hi,

McKajVah said:
...
Also, is it possible to get DSD256 and DSD512 support on the XMOS chip?

According to my calculations - yes, but for now I don't plan such thing.

Luca72c said:
... One can say it could be due to the lack of external power supply, but that can be said about my Xonar too, being it internally powered by my PC PSU as well.
...

It is better to distinguish between the final product and one that is intended for finish by DIYers. Xonar is the finished product, and as such it is designed to operate powered entirely by USB. There is a compromise for leaving the possibility to feed XMOS + PCM5102 entirety from USB host. One can show the full potential using external power. This is due to the small size that I aimed.

Scuba said:
...
1) Is it possible to use an USB cable without the +5V wire if we are powering the boards externally ?
2) Is it possible to separate the supply for the reclocker/oscillators from the supply of the DAC?

1) Yes, you can. Please check the specification file.
2) If you mode the DACs' PCB - you can do this

iperv said:
...
I don't understand how to use this button (there are two holes, it is not really a button), nor how I can see wich status (FIR/IIR) is now running. Is there a led?...

You can use on/off switch. There is no LED for filter on PCM5102 board, but you could wire the LED to the switch. You could use this kind of switch:

APEM 1A11-NF1STSE 2A Toggle Switch, SPST, On-On, 250Vac from Conrad.com

SCI Car toggle switch 20 A R13-404L BL LED 1-pole On/off 12 Vdc 20 A from Conrad.com

On the AK4396 board, there is a microcontroller, which observes the button (that's why there is a push button).

ghiglie said:
...
I can play superlatively HiRes FLAC, but I can't play DSF files (no sound and no LED on board). I am missing something in my configuration. ...

There is a guide on specifications page for configuration of Foobar for DSD.

Happy Holidays to all of you guys.

Regards,
Joro

Luca72c · 2013-12-23 9:53 pm

Happy Holidays to you, Joro! And thanks for all!

Scuba · 2013-12-24 12:22 am

Happy Holidays to you too, Joro!

I have finished my 2nd Salas shunt and it powers the XMOS board at the moment. Its improvement is clearly audible.
However, the XMOS board is not recognized by the computer if I am using an USB cable that has no +5V cable.
In the AK496's PDF is a refernce to this: "External power supply for USB part on pin11 and pin12. On I2SoverUSB board, USB jumper is opened and on AK4396 board, configuration jumpers are opened. In this way I2SoverUSB board consumes less than 10mA from USB host." If I understand correctly, there is something that needs power from the USB port (probably handshake-related?).
So the answer would be: no, it is not possible to use an USB cable that has no +5V wire even if the XMOS board is externally powered.

Scuba · 2013-12-25 12:25 pm

Well, I have an update: the USB XMOS board does work fine with a cable that lacks the +5V wire. The problem was my Mac Mini. It seems that the XMOS board is not recognized by the system if connected directly to MacMini's USB 3 ports. However, from the monitor's USB 2 hub works fine. Weird.
On Windows there are no compatibility problems.

MisterRogers · 2013-12-25 1:15 pm

On your post Scuba, I switched my USB from a powered hub to my MacBookPro directly - you're right. the XMOS receiver is not enumerated when connected directly to any of my mac ports. Works just fine when connected to a power hub.

XMOS DSD 384 kHz / 32bit USB

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