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USB to SPDIF converters shoot-out : EMU 0404 USB vs. Musiland Monitor 01 USD vs. Teralink-x vs. M2Tech hiFace - Page 111  

post #1651 of 1712
Thread Starter 
Quote:
Originally Posted by upstateguy View Post

Thanks slim, I just wanted to be sure.  Was it the self charging boxed version or the standard version with the external battery pack? (sigs are not always up to date)

 

USG
 


Mine is the boxed version.

 

Quote:
Originally Posted by jkeny View Post



It doesn't really matter as far as the sound goes - they are both equivalent!
 


But the boxed version is much easier to use

 

Once again, many thanks for the mod jkeny, I have had many hours of wonderful listening thanks to your modded hiface I personally wouldn't have been able to do the mods myself, so it is a great service you are offering for head-fiers (in my personal opinion).

post #1652 of 1712
Thanks Steve I read it before but I don't think it answers my questions above?
post #1653 of 1712

Thank you from me also to you John, things are indeed sounding better for me with the modded HiFace than with the Teralink-X.

post #1654 of 1712
Thanks guys, now try an attenuator & post your listening impressions
post #1655 of 1712

Steve,

I re-read your excellent article again & I see that it nearly answers my questions. Here are my thoughts:

 

With a very short cable (possibly no cable even) the first reflection will likely return to the receiver before the significant decision time. Now it's next return will be very much diminished & may well be still before the decision window. You can see that what I'm saying is that with a very short cable is it not the 3rd, 4th or 5th reflection visit that will only hit the receiver during it's decision time & is this insignificant by then? 

 

With longer cables does the recommended length not change with the different speeds 44.1, 48, 88.2, 96, 176, 192? So how do we calculate a cable length that can deal with all these speeds? Does the short cable not answer this?


Edited by jkeny - 6/22/10 at 12:53am
post #1656 of 1712

I am going to put the same pics, that I post in other thread, and no  body comment.This is a true 75ohms to go directed to DAC, no cable.

.IMG_0170.JPG

 

IMG_0165.JPG

post #1657 of 1712

@Wotam

 

That's pretty cool! What did you use to make sur ethat it is precisely 75 ohms?

I see that you made one for the Musiland but can you make one for the hiFace?

What components did you use and where did you get them?

Would you be able to make a T-Pad attenuator 10dB, 75 ohms instead with male BNC plugs?


Edited by punk_guy182 - 6/22/10 at 2:01pm
post #1658 of 1712

 

Quote:
 

Steve,

I re-read your excellent article again & I see that it nearly answers my questions. Here are my thoughts:

 

With a very short cable (possibly no cable even) the first reflection will likely return to the receiver before the significant decision time. Now it's next return will be very much diminished & may well be still before the decision window. You can see that what I'm saying is that with a very short cable is it not the 3rd, 4th or 5th reflection visit that will only hit the receiver during it's decision time & is this insignificant by then? 

 

With longer cables does the recommended length not change with the different speeds 44.1, 48, 88.2, 96, 176, 192? So how do we calculate a cable length that can deal with all these speeds? Does the short cable not answer this?

 

The cable length required is more a function of the edge-rate, not the frequency.  Really short cables, say less than 7 inches eliminate most of the problems since the reflections come before the edge is sampled at the receiver.

 

Steve N.

post #1659 of 1712

 

Quote:
 Steve, what do you think about using an RCA to RCA male adapter plugged directly into the DAC instead of using 1.3m good RCA cable like the Oyaide DR-510?

I quickly went through your link and will read it thouroughly.

 

This can be beneficial if your S/PDIF cable is a cheap one.  If you have a really good one, the cable can actually be beneficial in a 1.5m length.  These adapters are usually pretty bad, steel with bad plastic insulators and poor contacts.

 

Steve N.

post #1660 of 1712
Quote:
Originally Posted by audioengr View Post

 

 

The cable length required is more a function of the edge-rate, not the frequency.  Really short cables, say less than 7 inches eliminate most of the problems since the reflections come before the edge is sampled at the receiver.

 

Steve N.


Yes but the idea of the long cable is to have a specific discrete length(s) calculated such that the 1st reflection returns to the receiver in between decision windows (the current one & the next one). DO these decision windows stay fixed in the time domain with different datarates? i.e is the time period between the decision window for 44.1KHz the same asfor the 192KHz speed?


Edited by jkeny - 6/23/10 at 11:55am
post #1661 of 1712

 

Quote:
Originally Posted by audioengr View Post

 

 

This can be beneficial if your S/PDIF cable is a cheap one.  If you have a really good one, the cable can actually be beneficial in a 1.5m length.  These adapters are usually pretty bad, steel with bad plastic insulators and poor contacts.

 

Steve N.



I am using this one (Real Cable gold plated) instead of my 1.3m Oyaide DR-510. What do you think?

http://www.cablix.fr/photos/0d0c74ddd248f701b607b3cc5777c3ba/16768-567x567.jpg

post #1662 of 1712
Quote:
Originally Posted by Pacha View Post

I am using this one (Real Cable gold plated) instead of my 1.3m Oyaide DR-510. What do you think?

http://www.cablix.fr/photos/0d0c74ddd248f701b607b3cc5777c3ba/16768-567x567.jpg

 

Well, what do you hear?

post #1663 of 1712
post #1664 of 1712

 

Quote:
 Yes but the idea of the long cable is to have a specific discrete length(s) calculated such that the 1st reflection returns to the receiver in between decision windows (the current one & the next one). DO these decision windows stay fixed in the time domain with different datarates? i.e is the time period between the decision window for 44.1KHz the same asfor the 192KHz speed?

 

IME, you dont really have to worry about later reflections if the line is reasonably matched, just the first one.

 

Steve N.

post #1665 of 1712

 

Quote:
 I am using this one (Real Cable gold plated) instead of my 1.3m Oyaide DR-510. What do you think?

http://www.cablix.fr/photos/0d0c74ddd248f701b607b3cc5777c3ba/16768-567x567.jpg

 

It looks like either pot-metal or brass.  I dont know what the insulator is.  Teflon is best.

 

Only listening tests will tell.

 

STeve N.

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