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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 23rd March 2017, 03:32 AM   #6121
kartick is offline kartick
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Originally Posted by mbrennwa View Post
In the meantime I can report that the Kali works perfectly with my DDDAC board. I haven't changed anything at all since my latest post where I wrote that the crackle / noise was "almost gone". I guess I have a bad solder joint somewhere on my DDDAC board, and warming up the electronics for a while made the issue go away. I haven't changed the WaveIO settings either. Just beautiful music out of the Kali + DDDAC combo. Highly recommended! One of my best DDDAC upgrades!

(I have a replacement DDDAC mainboard on the way to me, and I'll try that nevertheless. Have to sort out my suspicious DDDAC board with it's many mods.)
Holy Cow!! So it just worked like that. That's amazing, congratulations.

In the meantime, I also have been trying various options/fixes to understand the problem.

Try 1 - Allo's Sparky (Software Volumia) ->I2S Out ->jumper cables -> DDDAC's I2S In = Massive Crackling sound from left channel (this was say 5 times the crackling observed when Sparky & Kali play together via I2S). Tried modifying the mpd.conf file with the suggested FIFO changes but it did not work out.

Read through the release notes 3.1 of Moode Audio and was extremely hopeful to see it mention proper compatibility with DDDAC as a pre-added device under the USB/I2S device list & also the fact that it pre-packages an MPD wildcard resample rates FIFO, FIFO scheduler for MPD. My understanding is that the crackle is due to the bit rates transferred to the DDDAC and that I was not able to set it up properly via the mpd.conf file in Volumio.

Hence, I ordered a Raspberry Pi 3 to try out the Kali with that and Moode Audio.

And.....the issue is FIXED !! I was so ecstatic when this issue was solved. For anyone who still uses an old RED motherboard and is wanting to go the Pi-based streamer route, here is what I had to try.

Played music through the Pi/Kali combo via I2S and music was clean but still there was a bit of crackle. Interestingly the crackle was very faint and non intrusive. However, I wanted a clean signal out till the last refinement. I started playing around with the settings and specially the MPD settings. I checked the HW parameters through the kernel and saw that at default settings 32 bit output was being sent to the DDDAC (or thats what the parameters said). I changed the rescheduled from TS to FIFO hoping that it will fix the crackle but it dint. I then changed the sampling rates to 16bit/* -> crackle dint go away, changed it to 24bit/* -> no change. Then I just thought let me change the rate to 24 bit & 192Khz and...it was GONE !! there was clean music coming out and my god does it sound OPEN. I agree that it is the best output I have heard from my DDDAC till date. Although from a puritan's point of view fixing the output to 24/192 is not ideal but at least it gives me the hope that it is fixable. I will try out more things to work out the as-is playback and report my observations.

Cheers !!
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Old 25th March 2017, 01:56 AM   #6122
eduard is offline eduard  Netherlands
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Hello,
LL1662 for '' isolating '' and supplying my digital gear with symmetrical power has arrived. Now waiting for the supplier to answer a single question before i can install it. My friends in Vietnam wanna try it too.
greetings, Eduard
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Old 25th March 2017, 07:25 PM   #6123
Alabama978 is offline Alabama978  United Kingdom
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What are you guys using to power the Kali and RPI combo? Spec on the Volumio site is 5V/3A.

They sell a "Wall wart" which us supposed to have filtering but I'm wondering is there a good alternative, as I don;t really want to have to plugin the wall wart as well as a power lead to the DDDAC?
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Old 26th March 2017, 03:49 AM   #6124
eduard is offline eduard  Netherlands
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Hello,
Need to get some sleep before connecting the output power cables to the ll1662. Then check once again before connecting my gear. The soldering terminations that lundahl uses are to flimsy for Me!
Just a few hours and I will know if I will buy one or two more ll1662 for my other electronics.
Greetings, eduard
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Old 26th March 2017, 12:35 PM   #6125
eduard is offline eduard  Netherlands
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Hello,
Will post results in a new thread because this one is not popular in anymore. Greetings, eduard
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Old 26th March 2017, 12:51 PM   #6126
mbrennwa is offline mbrennwa  Switzerland
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Originally Posted by Alabama978 View Post
What are you guys using to power the Kali and RPI combo? Spec on the Volumio site is 5V/3A.

They sell a "Wall wart" which us supposed to have filtering but I'm wondering is there a good alternative, as I don;t really want to have to plugin the wall wart as well as a power lead to the DDDAC?
Are you replacing the WaveIO with the Pi+Kali? You could use the PSU for the WaveIO.
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Old 26th March 2017, 01:21 PM   #6127
Alabama978 is offline Alabama978  United Kingdom
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No, I do not have the WaveIO bord or PSU. I'm currently running an RPI with a cheap PSU and will do a rebuild of the Dac with a new RPI and Kali + new 5V PSU for both.
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Old 27th March 2017, 05:21 PM   #6128
mbrennwa is offline mbrennwa  Switzerland
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Ok, then how about a simple trafo-rectifier-7805 setup? That's what I use for my Arduino-TVC and the Kali.
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Old 28th March 2017, 04:24 AM   #6129
steefdebruijn is offline steefdebruijn  Netherlands
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Hi all,

I am building this beast too and am planning to supply both the dddac and the RPi with dedicated power and provide power to the Kali through the dddac. Would that make sense?

Alongside that, I also have a third power supply for a balanced line stage of two a24 boards from amb.org

Steef
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Old 28th March 2017, 11:22 PM   #6130
Alabama978 is offline Alabama978  United Kingdom
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Ok, then how about a simple trafo-rectifier-7805 setup? That's what I use for my Arduino-TVC and the Kali.
Yes that would work, but there are better and cleaner regulators and designs now, in fact I suspect the wall wart that is advertised for the Kali may have better regulation and filtering than a 7805 design, but I could be wrong
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