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Audio-gd Digital Interface
Jul 28, 2010 at 8:05 PM Post #273 of 4,156
There may be some use, though I'm no digital expert, in turning off the PLL in a DAC when you are using a transport/interface which has lower jitter than the PLL in the DAC. This is what some of us are experimenting with. The USBFace is not a DAC and the DSP function is different.
 
Jul 29, 2010 at 8:43 AM Post #275 of 4,156
Any reviews yet?  I was considering the purchase of the M2Tech HiFace to go with my DAC-19 DSP but the DACFace has me reconsidering.
 
Jul 29, 2010 at 9:44 AM Post #276 of 4,156


Quote:
currawong said:
There may be some use, though I'm no digital expert, in turning off the PLL in a DAC when you are using a transport/interface which has lower jitter than the PLL in the DAC. This is what some of us are experimenting with. The USBFace is not a DAC and the DSP function is different.
Click to expand...


Thank you! I am asking the same thing, and doing some research now to try and figure out how to (safely without messing anything up) bypass the PLL on one of my dacs(EAD with PCM63).
 
Who is "some of us?"

 
 
Jul 29, 2010 at 4:59 PM Post #277 of 4,156
Don't you think Kingwa has tried all this already? Why doesn't someone ask him his advise directly? He's very good about answering. I think all who own and enjoy his gear would trust that he uses the DSP filters for good reason.
 
Jul 29, 2010 at 9:08 PM Post #278 of 4,156
The discussion about the PLL is in slim.a's review of the ACSS connection between his DAC19 and C2.  
 
I agree about asking Kingwa for his opinion.  I do wish he would post, but he is worried about his English.  
 
Jul 31, 2010 at 3:31 AM Post #280 of 4,156
Looks like Kingwa changed it quite a bit. I really like the outboard PSU idea. At 75USD it's a bloody bargain. I look forward to the comparison between this and the Jkeny HiFace.
 
Peete.
 
Jul 31, 2010 at 4:40 AM Post #281 of 4,156
[size=x-small]  [/size]I just don't like comparing apples and oranges.  This is a "digital interface",  he's not selling it as a transport.  I have great respect for AudioGD as a designer and am glad he he isn't calling it a transport which it clearly is not.  
 
Most important quote on the page :  "[size=x-small]The coaxial input can improve on SQ from some low/mid rang coaxial output source. Like some DVD player, PC sound card, low/mid rang CDP like the Marantz CD67, ect.  If the coaxial output source already quite Hi-end, don't expect the Digital Interface can improve on SQ."  [/size]
 
[size=x-small][size=x-small]this quote tells me that this unit in itself is not high end  [/size] [/size]
 You could never call AudioGD dishonest. 
 
 
Price is $265 with the external power btw,  not $75.[size=x-small] [/size]
 
Jul 31, 2010 at 4:59 AM Post #283 of 4,156
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Jul 31, 2010 at 5:06 AM Post #284 of 4,156


Quote:
regal said:
[size=x-small]  [/size]I just don't like comparing apples and oranges.  This is a "digital interface",  he's not selling it as a transport.  I have great respect for AudioGD as a designer and am glad he he isn't calling it a transport which it clearly is not.  
 
Most important quote on the page :  "[size=x-small]The coaxial input can improve on SQ from some low/mid rang coaxial output source. Like some DVD player, PC sound card, low/mid rang CDP like the Marantz CD67, ect.  If the coaxial output source already quite Hi-end, don't expect the Digital Interface can improve on SQ."  [/size]
 
[size=x-small][size=x-small]this quote tells me that this unit in itself is not high end  [/size] [/size]
 You could never call AudioGD dishonest. 
 
 
Price is $265 with the external power btw,  not $75.[size=x-small] [/size]
Click to expand...


Since the english used is not 100% clear, what does it do exactly.  It is a "Digital Interface" with digital outputs, no analog conversion involved.  I am having trouble figuring it out.  I mean only obvious conclusion to me would be its a transport of some type, what is it doing with the signal? What is it changing? How are things getting modulated? Those kinds of questions.  Because I know when the reviews come in ts going to go through the motions of "sound stage, brightness, darkness, openess, tube like, ect ect so I am looking for that objective answer.
 
By the statement "Don't expect the digital interface can improve on SQ" I get the idea that in terms of the actual audio it is 100% transparent.  Adding no strange effects or colorations, only upsampling if needed(or if enabled).
 
Jul 31, 2010 at 6:07 AM Post #285 of 4,156
 
The Digital Interface has two functions.
 
1. the USB input will converted to SPIF digital output. The DSP will serve as a digital filter to minimise the jitter and over sampling. The output of the interface will meet near high end sound quality.
 
2. The SPIF input will also pass throught the DSP and minimise the jitter to improve the SQ to near high end.
 
For high end players like AGD's CD7, the SQ will deteriate after passing through the "Interface", but the low end players will be benifit from it.
 
 
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