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Building with the Soekris dam1121
Building with the Soekris dam1121
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Old 4th June 2018, 12:45 AM   #421
derekr is offline derekr  Barbados
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Join Date: Mar 2009
Quote:
Originally Posted by soekris View Post
I'm sorry it's taking its time, the problem is we currently have the best weather ever in denmark, making it hard to get work done....

I'll get it done this week.
Ha! Now that I can understand. Good weather is to be enjoyed outside - and even though itís the norm where I live itís indeed not something to be wasted.
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Old 7th June 2018, 09:14 AM   #422
alec_eiffel is offline alec_eiffel  France
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Join Date: Oct 2004
Quote:
Originally Posted by jaffar View Post
My implementation is pretty straightforward:

PC (8-ch crossover/delays/DRC) -> USBstreamer I2S out -> 4 x dam1021 (bitclock and wordclock in parallel).

There's some suspicion of sync issues in this config, I can't hear it, so you're probably right that several boards sync within one wordclock period. Can be verified with impulse response measurements.

Many people would like to implement crossovers with a 2-channel source and multiple DAMs, but it's currently impossible to manage delays/time alignment due to hardware limitations of the dam1021/1121.

Anyone else with active crossover/multichannel setup?
Hello Jaffar, I am currently considering to go the same route as you:
- 6 or 8ch crossover/delay/RoomCorrection implemented in Roon, designed in REW/Rephase
- Roon RAAT 6 or 8 channel streaming to Allo USBBridge under DietPi
- miniDSP USB Streamer to 3 or 4 stereo I2S out
- 3 or 4 dam1021
Do you have a picture of your implementation/wiring ?
Open questions at my end are:
- parallel wiring of bitclock/wordclock : any precautions to take (wire lengths...)
- digital volume control : iíd like to use the same 10k linear pot to control all 3 or 4 dam1021, is it an issue to connect GND and 3.3V of all board together ?
- single ended output : buffered or not buffered ? Power amp should be classDaudio modules
- power supply : i inte
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Old 13th June 2018, 03:22 PM   #423
Var is offline Var
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Join Date: Jun 2018
Default First time DAC build

Hi all, I am new here. Looking for info on build of a possible integrated DAC/Amp with dam1121 board. It would be great if someone could help me with some doubts that I have. I have already gone through the manual, but might have missed something.
  1. I am looking at a dual-polarity PSU from ldovr.com and it has a 4uV noise rating. I was also considering the LT3045 PSUs, but can't find them in 5V capacity. Is 4uV noticeably worse than 0.8uV of LT3045?
  2. I am considering a bipolar supply for the analog side and another 5V supply for the digital side and the isolator on my USB-I2S board. Will a single supply for the analog+digital and USB board suffice?
  3. Is there any advantage in using 1021 vs 1121? I have looked at both and saw some firmware updates for 1021, but nothing for 1121. I also read that 1021 filters can be used with 1121. Does that include the new 4K tap filters also? Also 1021 seems to have the Si570 oscillator. Is this significantly better?
  4. I was thinking of using the output directly to an amp without a buffer stage. Is this fine?
  5. I was thinking of using an O2 as an amp for an integrated DAC/Amp solution. Will O2 be good enough for 1121, or is there anything that makes it a bad match?


...
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Old 7th July 2018, 06:45 PM   #424
Shutdown98 is offline Shutdown98  Netherlands
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Join Date: Dec 2010
Location: Zutphen, Netherlands
Hi all, i need some help...

I have been listening to my 1121 dac with great pleasure for several months.
I had the dac connected with xlr output (2 boards with balanced outputs) on my amp with xlr > rca cables.
Worked like a charm.

Now i am connecting to an amp with xlr inputs with xlr > xlr cables and now the left channel is not giving a good output. Very thin sound, no bass.
Did some checking and it is the left dac channel output. (ruled out cable, amp, speakers).

When i change back to the old amp with the xlr > rca cables the sound is good.

So it looks like left channel is not giving the right balanced output.

Any ideas what could be the problem?
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Daphile - PC streamer - JCat Femto > WaveiO usb to I2S > Soekris dual mono DAM 1121-01 > Bryston B60 sst > Discovery 4
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Old 7th July 2018, 06:49 PM   #425
TNT is online now TNT  Sweden
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Did you swap the channels with the new amp?

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Old 7th July 2018, 07:33 PM   #426
Shutdown98 is offline Shutdown98  Netherlands
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Location: Zutphen, Netherlands
Yes
If i change the xlr cable, at output of the dac, from left to right, it all changes to normal output.
So, cable, amp and speaker are functioning correct at right output, and if in left output sound is thin.
So amps, cables and speakers are ok.
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Daphile - PC streamer - JCat Femto > WaveiO usb to I2S > Soekris dual mono DAM 1121-01 > Bryston B60 sst > Discovery 4
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Old 7th July 2018, 07:37 PM   #427
TNT is online now TNT  Sweden
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Then I put a € cent on the strapping (and/or command config - maybe).

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Old 7th July 2018, 08:08 PM   #428
Shutdown98 is offline Shutdown98  Netherlands
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Location: Zutphen, Netherlands
I did not touch firmware or config. Never connected it to a pc. No need to do that for getting the boards to play.
Strapping is correct. One board is left, and one is right.
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Daphile - PC streamer - JCat Femto > WaveiO usb to I2S > Soekris dual mono DAM 1121-01 > Bryston B60 sst > Discovery 4

Last edited by Shutdown98; 7th July 2018 at 08:10 PM.
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Old 7th July 2018, 08:57 PM   #429
wcwc is offline wcwc  United States
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Join Date: Oct 2011
So the XLR to RCA cable worked OK, but the XLR cable does not. Check the cabling from the DAC board to the XLR connector. A loose connection there could make it seem like the DAC channel is bad. Did you swap the connectors on the left and right DAC boards?
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Old 8th July 2018, 10:08 AM   #430
Shutdown98 is offline Shutdown98  Netherlands
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Join Date: Dec 2010
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Quote:
Originally Posted by wcwc View Post
So the XLR to RCA cable worked OK, but the XLR cable does not. Check the cabling from the DAC board to the XLR connector. A loose connection there could make it seem like the DAC channel is bad. Did you swap the connectors on the left and right DAC boards?
Did swap the connection from left dac board to right xlr plug. Same ok sound with RCA plug but distorted output with xlr.
Internal cabeling is ok.
So it looks like the left board can not output xlr correctly...

Also checked strap pins again... No mistakes there.
__________________
Daphile - PC streamer - JCat Femto > WaveiO usb to I2S > Soekris dual mono DAM 1121-01 > Bryston B60 sst > Discovery 4

Last edited by Shutdown98; 8th July 2018 at 10:21 AM.
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