Audio-gd Digital Interface

[mmerrill99]

Quote:

Good point! But a short cable(1ft or so) should minimize those reflections? Dan Lavry thinks that the shorter your S/PDIF cable, the better

 
The thing is that I'm not sure any manufacturer wants to increase its RMA figures on purpose because they decided to go 75[size=large]Ω, but their customers ruined the connector due to 50[size=large]Ω[/size] cables..[/size]

Yes, so we are into the task of trying various ways of minimising these reflections after the event - "the search for the best sounding cable"
 
Why don't they just standardise on 50hms & be done with it? This would seem to make more sense, no?

 

[SoupRKnowva]

Quote:

Yes, so we are into the task of trying various ways of minimising these reflections after the event - "the search for the best sounding cable"
 
Why don't they just standardise on 50hms & be done with it? This would seem to make more sense, no?

but wasnt 75 ohms chosen using some sort of math? like to be the optimal impedance for transmission of digital data? its not like they just picked the number randomly and ran with it...

 

[mmerrill99]

Quote:

but wasnt 75 ohms chosen using some sort of math? like to be the optimal impedance for transmission of digital data? its not like they just picked the number randomly and ran with it...

There probably is a reason but I'm not sure how critical the 75ohm really is , AES/EBU balanced is 110ohms. I don't think the 75ohm is a special value that is optimal (it probably arose based on cheap 75ohm cables being around at the time) - I'm sure you can operate the impedance at a range of values - just look at the various 50hm connectors/ terminations. The important thing is to ensure a consistent impedance from transmitter through to receiver to avoid reflections. 

 

[dw1narso]

subscribed

 

[shampoosuicide]

The font has gotten swirlier.

 

[EraserXIV]

The font has gotten swirlier.

It appears they now use the swirly font for both their Audio-GD brand name and the actual product name itself. It seems to be a running trend with both the more recently released FUN and Sparrow.

 

[mmerrill99]

BTW, it looks like Audio_Gd might have to review their testing protocol as the statement that the Hiface is using 50 ohm BNC connectors appears to be incorrect http://www.head-fi.org/forum/thread/498151/m2tech-hiface-mods-and-discussions/105#post_6758850
 
 
 
Quote:

Marco has confirmed to me that they are using 75ohms parts. I'd like to apologize to the community for saying that it wasn't the case.

 

 

[ulyses]

What abaout dac19 dsp. Did we paid that price difference between dsp and df for nothing? If this one pair with df surpass over dsp and cost same, I will really sad. 

 

[Trapper32]

Wow...  Everyone's getting their shorts in a knot over something thats not even final or certain.   Let the dust settle and use your ears if indeed the product comes to market. With all the controversy, I don't doubt Kingwa will play his cards closer to the vest in the future.   

 

[DarKu]

USB Face ???
They copied even the name! Not original at all
But the device looks nice

 

[dex85]

double post

 

[dex85]

i was going to ask the same thing, since some of the Kinga's DACs now use the same Tenor USB chip with support for 24/96 and have DSP inside. obviously, USBface can be used with other brands DACs, but am i right to think that it is meant mostly for owners of Audio-Gd DACs with old 16/44.1 USB chips (or with no USB input)? 
Quote:

What abaout dac19 dsp. Did we paid that price difference between dsp and df for nothing? If this one pair with df surpass over dsp and cost same, I will really sad. 

 

[punk_guy182]

Quote:

USB Face ???
They copied even the name! Not original at all
But the device looks nice

Nobody cares about the name and Kingwa (Audio-GD) doesn't copy other manufacturers.
Let's stop bashing for nothing. I'm waiting for his response on the whole 75ohms issue. He is not very good at english and I think I may have understodd something else that he intended to say in the first place.
 
Peace!

 

[mmerrill99]

For those wanting to learn about & follow up on all this impedance matching & it's effect on digital lines, here's a great site I just came across http://www.allaboutcircuits.com/vol_2/chpt_14/index.html

 

[haloxt]

If anyone is new to these things, USBface short for "USB" and "interface". USBFace does have some weird connotations, so if anyone has suggestions for a new name you should tell it to Kingwa right now before they give this product the green light and manufacture all the boxes. I think they should call it USB Smiley and just draw a smiley face after USB on it .