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dam1941 - Next Gen Discrete R-2R Sign Magnitude 24 bit 384 Khz DAC module
dam1941 - Next Gen Discrete R-2R Sign Magnitude 24 bit 384 Khz DAC module
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Old 26th December 2020, 01:18 PM   #1021
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by euro21 View Post
Jean-Paul, IMHO you generalize strongly. :-(
At least as much -poorly designed- SS device has "coloration", irritating tone as tube ones.

BTW where are -in this case- noise and "coloration"? :-p
https://www.diyaudio.com/forums/atta...1-spectrum-jpg

Noise floor is high and distortion is high compared to good DS DACs - even
compared to PCM1704 it's pretty inferior.

TCD
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Old 26th December 2020, 04:17 PM   #1022
euro21 is offline euro21  Hungary
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dam1941 - Next Gen Discrete R-2R Sign Magnitude 24 bit 384 Khz DAC module
I think you misunderstood my conversation with Jean-Paul.
This spectrogram is only the preamp (after the 1941).
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Old 26th December 2020, 10:54 PM   #1023
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by euro21 View Post
I think you misunderstood my conversation with Jean-Paul.
This spectrogram is only the preamp (after the 1941).
Yes, my apologies, I thought it was pretty abysmal for a DAC.

TCD
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Old 5th January 2021, 10:06 PM   #1024
Blitz is offline Blitz  Germany
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Quick question...I figured that my tube amp likes a little higher level input. So, i like what I hear when we are at +2 or + 4 of the Dam1941....i just wonder: How degenerative is this ?...so how much information are we loosing within the DAC when going above 0 ?
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Old 5th January 2021, 10:12 PM   #1025
TNT is online now TNT  Sweden
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dam1941 - Next Gen Discrete R-2R Sign Magnitude 24 bit 384 Khz DAC module
Digital gain is about math. -2 or +2 dB is "the same thing". In the case of minus you are throwing away LSB "bits" and on plus, your have to suck in (LSB) bits - 1 bit for every 6 dB.

You do the math

I would say like this - even if you put it at 0 and think you have a bit clean conversion - think again as the filters are also math so everything is recalculated anyways before conversion compared to the CD record. If you like the sound then you are OK - no?

So + is no info loss but minus (attenuation) really is. Then you have the rounding errors for both directions in the math...

//
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Last edited by TNT; 5th January 2021 at 10:14 PM.
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Old 6th January 2021, 09:47 PM   #1026
fedde is offline fedde  Netherlands
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Well... If clipping would occur, this would have more impact than some bits sucked in..
(Depending on source material and amount of attenuation in the digital filters).
So I only would do this with low volume material to be on the safe side...
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Old Today, 06:21 PM   #1027
Blitz is offline Blitz  Germany
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Well, I looked at it with an Oscilloscope while playing a sinus 1000hz 0db...full signal. With 0db you have a clean sinus, the more you add like +4 the more it does not look like a sinus anymore, becomes more a non symetrical triangle.

Different question:
I am reading always about transients in a music signal like the strike of a drummer etc can create impulses which are like 16db bigger than the musical signal...well what does mean in terms of Vpp-Envelope really ? What I mean: When I play a sinus digital 0db, so full digital signal: And I measure this with an osci: Is this the biggested technical possible analog signal the DAC can send to whatever comes next ? Or can those transients become even bigger than that ?
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Old Today, 07:06 PM   #1028
TNT is online now TNT  Sweden
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dam1941 - Next Gen Discrete R-2R Sign Magnitude 24 bit 384 Khz DAC module
0 dBfs is the biggest. More and it will clip - thats way you start to see a triangle. Most CD records are recorded with its normal (mean?) level 10-30 dB lower than 0 and can therefore handle transients of 16 dB and more. It works pretty well :-)

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