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Old 8th March 2015, 03:16 PM   #2001
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Quote:
Originally Posted by spzzzzkt View Post
If you wire the relays so they shunt the signal to ground then they are not in the signal path at all, so pose zero risk to SQ.

What I find so disappointing is that this would have been so easy to integrate into the board design. And for a board that is promoted as essentially an all in one, digital preamp which can be connected straight to amps it's a show stopping flaw.

TBH I doubt I would have purchased the DAM if I'd know that it couldn't be used safely without add-on protection circuits.
This is DIY! With your excellent work on the filter side one would think you would be more perturbed about having to do that instead of supplying output muting relays!

If someone was to make the DAC as a finished product they would have a relay circuit on the output. Transparent relay circuits are not simple. The device I pointed to is what Dave Davenport uses in his DAC line stage and has evolved over time. He used to incorporate the relays into the line stage and let them be powered by the DC filament supply (I think I am remembering correctly) but found it needed its own power supply (regulator) to sound its best. This is not a throwaway, as with anything in audio there are unwanted effects that must be minimized

I cannot stand relays, even the one above, and am grateful they are not incorporated into the board. Even used to shunt the signal to ground they have an effect on the sound when open. Especially those tiny enough to be used on board, I can only imagine.

One's small enough to fit on the board are very suspect to my severe case of audio nervosa.

Having amplifiers with delicate output devices I always turn the amps off first and then leave the DAC on continuously. Though I did accidentally turn the thing off and nothing happened but that sound. Wasn't THAT bad.

I remain concerned that whatever could be incorporated into the board to eliminate this could make things worse. How invasive would the code for this be? I prefer minimizing that kind of thing in a perfectionist product. If the DAC were to be used in a car radio who would care or be able to hear it anyway?

AS with any audio device the SOEKRIS is benefiting from use. Sounded good to me from the first using upsampled files, I agree 16/44 files sound not so good. All of my digital music files were with cues per cMP so I am having to start over, anyway. Why not make them 24/196 as cheap as storage is?

Hope to eventually figure out how to use the series port but it is not the most important thing, yet. My MB with the series output died and now I have to use USB.
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Old 8th March 2015, 06:45 PM   #2002
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After burning in the hardware with standard mains supply for two weeks and playing music with the NOS "filters" by spzzzzkt and upsampled music (384 KHz) I must say that this a very, very capable dac. It beats a lot of things I've listen to in the last years. I'm using a high efficient tqwt loudspeaker with fullrange driver which is very sensitive to localization of instruments and the coherency of the music. It's very detailed with a plausible room information and a top analog like sound. The dac can easily be used in long listening sessions with great satisfaction. I agree in opinion with rickmcinnis that changes should be done carefully to not destroy the basic characteristics.
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Old 8th March 2015, 09:20 PM   #2003
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Quote:
Originally Posted by rickmcinnis View Post
Having amplifiers with delicate output devices I always turn the amps off first and then leave the DAC on continuously. Though I did accidentally turn the thing off and nothing happened but that sound. Wasn't THAT bad.
.
Would you like me to send you the Hypex UcD180HG +HxR module that the "insignificant" power down pop killed in my amp?

I ended up having to replace both modules as the board I had was an older revision. So your "nothing to worry about" cost me close to the original purchase price of the DAC in repairs to my amp.

Power down protection is based on supply voltage. Once voltage drops below a certain point, you remove power from a NC relay. Muting is done by shunting the output to GND when the relay is closed - this was the method used by the Pass Labs D1 and others so has hi-end "cred". There is no need for code or relay contacts in the signal path. If it was extended to muting during unlock, you would use the same code that is in place for the lock/unlock LED to close the relay.

Last edited by spzzzzkt; 8th March 2015 at 09:43 PM.
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Old 8th March 2015, 11:53 PM   #2004
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Quote:
Originally Posted by spzzzzkt View Post
Would you like me to send you the Hypex UcD180HG +HxR module that the "insignificant" power down pop killed in my amp?

I ended up having to replace both modules as the board I had was an older revision. So your "nothing to worry about" cost me close to the original purchase price of the DAC in repairs to my amp.
This being DIY audio, I find it funny for something made almost entirely of through-hole components and a few SMD devices that you couldn't replace those blown components, rather instead buy new complete boards.
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Old 9th March 2015, 05:09 AM   #2005
ristar is offline ristar  Singapore
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I don't think there is any reason to pick on spzzzkt. He has contributed extensively to the development of the DAM1021. Anytime something goes wrong you will feel frustrated. He is just venting a tad.

I don't expect a perfect products from independent small vendors and i think most people should cater their expectations that way... especially if you don't know how some folks don't know how to connect power supplies to the DAM1021. For those just hang back a tad until all the knowledge is out (or the manual).

Peace all!

P.S. spzzzzkt thanks for your work on filters!
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Old 9th March 2015, 08:04 AM   #2006
Dimdim is offline Dimdim  Greece
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Quote:
Originally Posted by spikestabber View Post
This being DIY audio, I find it funny for something made almost entirely of through-hole components and a few SMD devices that you couldn't replace those blown components, rather instead buy new complete boards.
This is what the bottom of one of my UcD400HGs looks like:

Click the image to open in full size.

I imagine that the 180HG is pretty similar.

Can you really blame spzzzzkt?

P.S. Sorry for the OT..
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Old 9th March 2015, 08:14 AM   #2007
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Quote:
Originally Posted by rickmcinnis View Post
...Sounded good to me from the first using upsampled files, I agree 16/44 files sound not so good. All of my digital music files were with cues per cMP so I am having to start over, anyway. Why not make them 24/196 as cheap as storage is?
So I just have to convert all of my 25,000+ redbook files in order to make this dac sound decent?
Piece of cake.
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Old 9th March 2015, 08:17 AM   #2008
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Quote:
Originally Posted by inMotion View Post
I must say that this a very, very capable dac. It beats a lot of things I've listen to in the last years.
Would you care to reveal the names of these dacs? Were any of them discrete r2r-ladder dacs or just the usual sigma-deltas?
Without knowing the reference dacs, statements like these are of absolutely no value for me.
So far in this thread Iíve only come across one person (apart from myself) who had any experience with a TotalDac (or any other r2r-ladder dac) which was a brief encounter at an exhibition as I recall it.
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Old 9th March 2015, 08:43 AM   #2009
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For what its worth. After playing with different filters (still "mine" sounds best to my ears - subjective - I know....)
Running i2s in , 7.5Vac direct to the dam module and unbuffered rca to amplifier (no digital volume)
Raspberry pi2 - USB out - Gustard U12 - i2s"lvds" out - i2s "lvds" in dam1021.

This sounds better by a quite big margin than my "uber tweaked" Audio Note dac (ad1865 r-2r). 6463 analog stage. AN silver PIO at the outputs etc. (only one cap costs more than the whole dam1021 chain...

Thanks again Soekris.
And spzzzkt keep up the good work.
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Old 9th March 2015, 11:27 AM   #2010
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Originally Posted by bambadoo View Post
For what its worth. After playing with different filters (still "mine" sounds best to my ears - subjective - I know....)
Which is your filter and where can I get it?
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