Es9018K2M

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Es9018K2M

Postby tux » Mon Oct 13 2014 08:08

Derek,

I am planning to buy the kit from diyinhk which includes the XMOS usb. I am also planning to buy the power supplies from the same website (TPS7A4700 based), plus two toroid transformers from a local manufacturer.

I am not interested in volume control, arduino etc. I just want the simplest setup possible using USB.

My current setup is a weiliang AK4399 based (not diy) with changed Opamps.
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Es9018K2M

Postby DerekR » Mon Oct 13 2014 19:06

That's fine, I think it's an excellent value for money DAC. Just to reiterate, do not buy the kit with the "modified XMOS firmware bit-perfect volume control" USB board. Get the DAC by itself then get one of the two USB-to-I2S boards available. My choice would be the $99 isolated board as it is DSD and DXD capable. An Amanero is also known to work - as tested by BlgGear on Hifiduino. Drop a note here on your impression when you get it going.
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Es9018K2M

Postby tux » Tue Oct 14 2014 07:42

Hi Derek,

i am confused with regards to the xmos boards. The one inluded a option in the kit is isolated and dsd dxd capable:

http://www.diyinhk.com/shop/audio-kits/ ... nd_led_pcb
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Es9018K2M

Postby DerekR » Wed Oct 15 2014 02:37

tux wrote:Hi Derek,

i am confused with regards to the xmos boards. The one inluded a option in the kit is isolated and dsd dxd capable:

http://www.diyinhk.com/shop/audio-kits/ ... nd_led_pcb


Don't buy the one you quoted above. The firmware in the XMOS isolated board that is part of that kit has been modified and this seems to be a problem. Buy the K2M DAC separately then buy the non-modified isolated DSD/DXD XMOS board ($99) separately.

Buy this XMOS board http://www.diyinhk.com/shop/audio-kits/ ... lator.html and this DAC http://www.diyinhk.com/shop/audio-kits/ ... 18k2m.html I.e the PCB only, not the kit.

Also, don't forget you have to buy a +/- 12V board and two 3.3V supplies - the new 3.3 V Analog Devices-based boards are supposed to be lower noise than the TI (http://www.diyinhk.com/shop/audio-kits/ ... _green_pcb). Sorry if I'm stating the obvious.

Highly recommend buying the JFET based opamp as well, I find it sounds better than the supplied 5532. http://www.diyinhk.com/shop/audio-kits/ ... rsion.html

Finally, if your local transformer manufacturer does R-core transformers then try an R-core as against the toroidal - they are quieter and preferred for preamps/DACs.
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Es9018K2M

Postby tux » Wed Oct 15 2014 06:45

Thank you very much for your reply Derek.

I have ordered the kit, being confused that the xmos are the same. I have now asked to change it and let's see their reaction.

When you say problem what do you mean? Is there any link I can read? I am not interested in volume control at all. volume mixer is always disabled in mpd.conf in my setups and i change the volume from my amps.

With regards to power supply I bought:

http://www.diyinhk.com/shop/audio-kits/ ... 5v-1a.html

and

http://www.diyinhk.com/shop/audio-kits/ ... -1ax4.html

I haven't bought any trasnformer yet, but there's no greek manufacturer that makes rcores unfortunately. If I want rcore I will have to trust ebay and this is something I am afraid of.
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Es9018K2M

Postby DerekR » Wed Oct 15 2014 12:10

Those power supplies will work fine.

I outlined the problem with the modified XMOS board in an earlier post on this thread. It would seem the 'bit-perfect volume control' kit is aimed at Windows/Foobar owners primarily. I would love a Linux expert to prove me wrong......

So, for those who do not wish any software control, there is no need for the modified-for-volume-control XMOS board - better safe than sorry.

For those who would like to leave a 'preamp' out of the equation and don't mind a little DIY, try this DAC with the Hifiduino implementation. This gives you the built-in ESS volume and filter control. Just use the non-modified diyinhk USB XMOS DSD/DXD board - or your USB-I2S board of choice.

I think the K2M/Hifiduino implementation is a really good bang-for-the-buck DAC/preamp utilizing all the features of the ESS 9018 Sabre including 32-bit volume control.
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Es9018K2M

Postby tux » Wed Oct 15 2014 14:09

Thanks for your reply!

Do you believe that if I do not touch the volume and I leave it disabled in mpd.conf that I will experience any problem with this?
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Postby DerekR » Wed Oct 15 2014 21:26

tux wrote:Thanks for your reply!

Do you believe that if I do not touch the volume and I leave it disabled in mpd.conf that I will experience any problem with this?


The mpd.conf configuration doesn't matter, the problem is that, with the modified XMOS USB board, there is an I2C connection to the K2M (the SDA and SCL pins) and when there is a change of sample rate the XMOS sends a chip reset to the DAC via this I2C bus. If you read the description of the non-modified XMOS board it mentions not connecting the I2C pins. Unfortunately it seems you can't run the modified board with the I2C disconnected (I've tried) so I suspect you will have issues.

I will say that I have not tried a Pi and Volumio via USB but I don't think it will behave any differently to the Alix as it is the modified XMOS chip that is sending the reset, nothing to do with the transport. I will try and hook a Pi up later today and confirm.
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Postby tux » Wed Nov 05 2014 13:03

The first part of the dac is ready and I admit that I am really satisfied!

Image

Ι had a small accident and the xmos board was about to burn (something was wrong with my led pcb - I have removed it now). Now it works ok but in order to be sure I ordered the separate xmos as suggested above to also have the option to play with arduino.

I am also waiting for an lme49880 opamp to try. The second stage will be to put it on a nice enclosure. I am thinking of creating one from scratch using wood and plexiglass but I haven't decided for sure yet.
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Postby sjaaklaan » Thu Nov 06 2014 19:56

Looks good! Can you confim that the DAC works with the Raspberry Pi (B/B+) over I2S?
I have ordered the same DAC and power supplies, but without the XMOS board.
And does playing DSD files work as well?
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