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Old 19th March 2015, 08:14 AM   #2191
vuki is offline vuki  Croatia
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But in DAM dsd will be converted to pcm regardless of transfer format.
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Old 19th March 2015, 08:54 AM   #2192
ristar is offline ristar  Singapore
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Quote:
Originally Posted by vuki View Post
But in DAM dsd will be converted to pcm regardless of transfer format.
Yes it does... but why don't you check up the difference DSD sampling rates have on the dsd stream? The noise is significantly different from dsd64 when up sampled... having a better starting point before conversion to PCM can't be bad can it?

Anyways all moot until we are able to try.
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Old 19th March 2015, 10:51 AM   #2193
vuki is offline vuki  Croatia
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Quote:
Originally Posted by ristar View Post
Yes it does... but why don't you check up the difference DSD sampling rates have on the dsd stream? The noise is significantly different from dsd64 when up sampled... having a better starting point before conversion to PCM can't be bad can it?

Anyways all moot until we are able to try.
Could you please link some measurements of dsd128 vs. dsd256/512
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Old 19th March 2015, 11:29 AM   #2194
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Default Business not charity or digital education project

Guys,

Soren has designed this as a flexible and low cost R2R solution for Red Book and 24 bit higher sampling rate digital music, as it says in black and white on page 1 ....

“ Up to 24 bit / 384 Khz input from SPDIF, I2S and USB (via USB to I2S interface board), with isolation on the I2S interface.

Not DSD.....!


DSD is still a tiny ( although vocal!) niche in domestic audio.
Red book is a big market and even within the small niche of DIY audio there are 100's maybe 1,000's of interested DIY buyers for Soren to supply this product to, this thread is about optimising the Red Book product to sell into this market.

Soren is a business man not a DIY guy with no financial interest, so every minute of Sorens time is precious.
Please show him some respect and allow him to focus on the product as described and keep this thread focused on topic.

Maybe the dozen or so DSD guys can start their own thread?

Thanks
Derek.
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Old 19th March 2015, 11:39 AM   #2195
ristar is offline ristar  Singapore
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Quote:
Originally Posted by vuki View Post
Could you please link some measurements of dsd128 vs. dsd256/512
Agree that discussion on dsd512 etc is getting off topic... here are Miska's (creator of hqplayer) measurements
iFi iDSD Micro measurements - Blogs - Computer Audiophile

Should be the end of the DSD discussion.
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Old 19th March 2015, 12:29 PM   #2196
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Comparing PCM/DSD measurement on a DSD DAC, or other way around doesn’t reveal the trough according to Ted. As a DAC optimized for either one will measure more favorable to the platform intended.

As nearly all music I personally listen to are created on PCM platforms I don’t have much interest in DSD. And DXD of today haven’t truly made me think we will see any technology shift in the near future for the recording industry. So my appeal to Søren is to focus his time on the PCM implementation.
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Old 19th March 2015, 01:37 PM   #2197
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Hi.

The latest report of a flaw in the volume control triggered me to write this post.

Meanwhile I can't keep track of all the issues/weaknesses/workarounds that's been reported. Many of them are of minor nature of course.
I don't know when and if they'll be resolved.
All this gets me further away from buying this DAC.

We should write up a summary of reported flaws, weaknesses
and workarounds.
That list should also outline, if items are acknowlegded by Soeren and when there can be a solution expected and how a solution will look like for any of these.

New features requests and improvement proposals, such as DSD support or new filters, are a different story. These can be kept in a different list.

The right place to put the list is IMO the Soekris DAC Wiki over here. Unfortunately it's not open for editing, otherwise I would have added some stuff already.

THX
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Old 19th March 2015, 01:44 PM   #2198
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Perhaps use bugzilla?
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Old 19th March 2015, 02:17 PM   #2199
ristar is offline ristar  Singapore
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There is a problem with the volume control? If it's spzzzzkt's report, I thought he mentioned it's likely soldering wasn't as good as it should be?

Glt brought up a point on how the DAC may possibly load up at full volume on power up with the pot connected - this wasn't addressed. For all we know, that may be part of the new firmware meant to reduce power on and power-off thud.

Bugs/potential issues that I know of:
  • Input selection is buggy (reported by Normunds) - it locks to USB almost always... Soren has acknowledged this and will be addressing it in the next firmware
  • Power-off thump (reported by TNT and RIP his speakers) - I run mine through Tibi's volume controller and the DAC goes off after my attenuator goes to standby so I don't have the turn-off thump.... but Glt has proposed the 1.4W load resistors on the negative rail to balance power drain as a potential workaround.
  • Turn-on pop (reported by TNT) - It's loud on my speaker setup, but not loud on my headphones [I never used the buffered output, though]. Soren acknowledged this and will likely be addressed in the next firmware
  • Pops while signal locks (reported by TNT)... primarily affects Amanero users. These pops can also happen without sample rate changes (i.e. searching a particular track to a certain point can cause this). Soren has acknowledged this and will attempt to both eliminate the pops as well as reduce the amount of time the DAM1021 takes to lock onto a signal to 300ms
  • Inputs labelled wrongly on the diagram (reported by our dear TNT, too ). Erm... just switch the cables around... just the diagram is labelled wrongly
  • Filter errors (?) (reported by zfe). Sorry, not technically inclined enough there... but I believe Soren has acknowledged this as well.

Not sure if I missed others... but that's all I got.
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Old 19th March 2015, 02:21 PM   #2200
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Quote:
Originally Posted by albertNL View Post
Perhaps use bugzilla?
Lets not overdo things. That's not our job. It's Soerens job.

If Soeren wanted to setup a professional bugreporting, he would have done so long time ago. You do that before you launch a product. You do that when designing a product.

I doubt that he will set something up for the customer base. There are not that many issues from our side justifying such an effort.

Keep in mind, any extra effort will increase prices!! (That we learned earlier)

If we put a list into the Wiki, it'll be much easier to track and maintain from our side.
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