Audio-gd Digital Interface

[SP Wild]

The upcoming M2tech Evo will have AES, BNC, RCA and IS2 - and a 10V DC input and timing lifted away from the computer with two built in clocks and even an input for an external clock unit.  It just ticks all the boxes.  Period.

 

[noinimod]

Quote:

I think this is a good guess.
 
Indeed it is a shrink down version of RE3.
 
RE3 is a bit expensive, so KingWa produce a scale down with minimal functions.
 

it isn't a guess, lol. <USD200 is the price kingwa quoted me
 

 

[Currawong]

Fair enough about the cynicism with the "kill" comment, but he has canned (ha!) a couple of ideas where either he wasn't satisfied with the sound quality or reliability.  He is genuine about creating good gear (rather than flogging generic stuff on eBay), as well as genuine feedback as opposed to hype.
 
Wouldn't mind seeing some HiFace vs. USBFace jitter measurements though, after he's put in a 75 Ohm socket (someone, who shall remain nameless, suggested it was a 50 Ohm one, oops if so) and 75 Ohm wire.

 

[cravenz]

Quote:

Fair enough about the cynicism with the "kill" comment, but he has canned (ha!) a couple of ideas where either he wasn't satisfied with the sound quality or reliability.  He is genuine about creating good gear (rather than flogging generic stuff on eBay), as well as genuine feedback as opposed to hype.
 
Wouldn't mind seeing some HiFace vs. USBFace jitter measurements though, after he's put in a 75 Ohm socket (someone, who shall remain nameless, suggested it was a 50 Ohm one, oops if so) and 75 Ohm wire.

I'm very supportive if this is what he is doing and it does show his commitment to building a good product and I've seen from several posts that there is a fair bit of interaction between the manufacturer and the the consumers ensuring that the product is tailored as much as possible to the needs of the consumers and with good quality products in mind.
 
only comment is that I wish the design of the box itself could look a tad nicer

. yes yes, I know it makes no sonic differences heh.

 

[punk_guy182]

 
Quote:

Nice, I hope Kingwa will also implement this within his DACs, replacing the current USB input, so that we won't need an external box anymore.

That's what I proposed when the RE3 was first released. I'm not sure that having more elements (USb cable, converter, etc...)  in the sound chain can be very good for SQ.

 
Quote:

Wish it had AES.

You are your AES...

 
Quote:

Wouldn't mind seeing some HiFace vs. USBFace jitter measurements though, after he's put in a 75 Ohm socket (someone, who shall remain nameless, suggested it was a 50 Ohm one, oops if so) and 75 Ohm wire.

Kingwa has confirmed to me that the BNC socket on the USBface is 50 ohms because according to him the HiFace BNC socket is also 50ohms and he wanted to match the hiface as much as possible for comparaison purposes.

 
Quote:

only comment is that I wish the design of the box itself could look a tad nicer

. yes yes, I know it makes no sonic differences heh.

 
I'm ok with the design as long as the price stays low.
 

 

[DaveBSC]

Does anyone know if this is adaptive or asynchronous yet? If it's just another 24/96 adaptive converter, the Hiface EVO seems like the better choice.

 

[noinimod]

The Tenor chip is adaptive. Woot, the hiface is a 75 ohm BNC? Damn it, i need to replace the BNC on mine then

 

[punk_guy182]

Quote:

The Tenor chip is adaptive. Woot, the hiface is a 75 ohm BNC? Damn it, i need to replace the BNC on mine then

No it's a 50ohms BNC socket. Marco said that it the Hiface BNC would be true 75ohms but he's wrong.

 

[noinimod]

Quote:

No it's a 50ohms BNC socket. Marco said that it the Hiface BNC would be true 75ohms but he's wrong.

After all the trouble i went to for my 75 ohm BNC connectors, dang. Did you swap out the BNC socket on your hiface?
 

 

[leeperry]

75[size=medium]Ω female BNC connectors are hardly ever used for a very good reason, [/size][size=medium]and many ppl think that "the impedance mismatch problem at the connector is academical": http://recforums.prosoundweb.com/index.php/m/381397/0/#msg_381397[/size]
 
[size=medium]Does this interface use the Tenor chip BTW?[/size]

 

[Currawong]

leeperry: Interesting.  That explains much.

 

[mmerrill99]

Quote:

75[size=medium]Ω female BNC connectors are hardly ever used for a very good reason, [/size][size=medium]and many ppl think that "the impedance mismatch problem at the connector is academical": http://recforums.prosoundweb.com/index.php/m/381397/0/#msg_381397[/size]
 
[size=medium]Does this interface use the Tenor chip BTW?[/size]

This could well be the pragmatic view of 75/50ohm connectors & the path taken by manufacturers but stating that impedance mismatch is academic is mistaken as far as I know. This 2008 quote from Bruno Putzeys (designer of Hypex amps) ignores the real speeds that cause the problems (reflections) of impedance mismatches & this is the rise time which is where the 0 or 1 are sensed. These rise times can be as fast as 2nS so reflections can be a real problem 

 

[Currawong]

A useful question would be: Will the socket make a significant audible impact? However, this would surely need measurements to determine properly IMO.

 

[mmerrill99]

Quote:

A useful question would be: Will the socket make a significant audible impact? However, this would surely need measurements to determine properly IMO.

If impedance mismatch happens anywhere (including the sockets) then theory says that it will cause reflections (at the speeds mentioned for rise times). These reflections can cause jitter - whether that happens in your implementation is down to individual implementations. But, is it not better to design out these issues in the first place rather than try to fix them at a later stage?

 

[leeperry]

This could well be the pragmatic view of 75/50ohm connectors & the path taken by manufacturers but stating that impedance mismatch is academic is mistaken as far as I know. This 2008 quote from Bruno Putzeys (designer of Hypex amps) ignores the real speeds that cause the problems (reflections) of impedance mismatches & this is the rise time which is where the 0 or 1 are sensed. These rise times can be as fast as 2nS so reflections can be a real problem 

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]