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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 107  

post #1591 of 1712
Quote:
Originally Posted by Jocko Homo View Post

 

The purpose of the 'Net is the open exchange of knowledge. But some folks (guess who I think is one of the prime offenders) expect guys like me to supply them with everything I know, and turn it into something they can make a few quid off of.

 

Jocko
 



Bingo Bango Bongo,  I am tired of the mods letting Jenky invade these free forums to make a buck and he isn't even listen as a member of the trade.  Its dispicable that Head-fi allows this to continue.  

 

I've shared many mods to this forum and open source projects and never charged a nickle,  never hid anything.  That is the spirit of DIY,  Jenky is clearly on the otherside.  I told him to patent his LiFePo4 idea months ago,  instead he's just acting with bad character and impeding the development of the DIY Hiface modding scene.

 

On a lighter note Jocko would be surprised that I am running my modded Hiface with an 18ft USB cable and it sounds great.

post #1592 of 1712
Quote:
Originally Posted by regal View Post

 

 

There are rumors floating around that the hiface SPDIF transmission doesn't meet SPDIF spec,  that is what Jocko is referring to I'm fairly certain.   The only way anyone would get to the bottom of the theoretical arguments is with a oscilloscope thats all Jocko is saying,  he seemed pretty disgusted that a guy profiting on the Hiface can't grasp that simple concept.

 

Otherwise I agree with souldrider,  experiement try then find whats best for your system. 

 

No body on these forums know digital theory and real world application like Jocko,  don't even argue with him on that level,  its down right silly. 

Jesus Regal, what is your problem with me? You are benefiting from my posts & pics on how to modify the Hiface & DIYing it yourself - ask Jocko to give you a pictorial guide to his Legato USB DAC & how it's put together & see what answer you get. Get off my case - you really started all this when I told you that LiFePO4 batteries were not all manufactured in one factory in China - can you just get over it.

 

I fully acknowledged Jocko's expertise in a post a while back BUT  he does have commercial interests in this area & that might "prevent" him from being lets say "fully forthcoming with the facts" So you need to be aware of this
 

post #1593 of 1712


You can't solve these issues by theorizing about them to death.  You pull out the SPDIF spec read it and then you plug in an oscilloscope and go from there.  Its empirical (to the general audience look up that word please.)     This whole thing reminds me of the damn oil spill that the government agencies have spent over a month theorizing,  at some point you have to test.  If all you have is ears,  thats better than words!

 

 

Quote:
Originally Posted by ROBSCIX View Post


 


He suggested that it may work. unless I am misunderstanding the postings.

Where  did you see the part about it being out of spec for S/pdif output.  Do you mean the part about the output voltage?

post #1594 of 1712


No Jenky you have pushed the limits of the DIY collective spirit here and other places.  You came up with an incredible idea to use LiFePO4 batteries,  any 1 st year electrician could trace the circuit and mod it to battery power.   Either you are accepting the open source DIY spirit or you're not,  and lately you have abandoned it.  What you don't realize is there are plenty soldering inept folks out there and I was one of your biggest supporters,   you would have had plenty of business but you blew it on the Hiface thread IMO.  
 

Quote:
Originally Posted by jkeny View Post



Jesus Regal, what is your problem with me? You are benefiting from my posts & pics on how to modify the Hiface & DIYing it yourself - ask Jocko to give you a pictorial guide to his Legato USB DAC & how it's put together & see what answer you get. Get off my case - you really started all this when I told you that LiFePO4 batteries were not all manufactured in one factory in China - can you just get over it.

 

I fully acknowledged Jocko's expertise in a post a while back BUT  he does have commercial interests in this area & that might "prevent" him from being lets say "fully forthcoming with the facts" So you need to be aware of this
 

post #1595 of 1712
Quote:
Originally Posted by regal View Post





Bingo Bango Bongo,  I am tired of the mods letting Jenky invade these free forums to make a buck and he isn't even listen as a member of the trade.  Its dispicable that Head-fi allows this to continue.  

 

I've shared many mods to this forum and open source projects and never charged a nickle,  never hid anything.  That is the spirit of DIY,  Jenky is clearly on the otherside.  I told him to patent his LiFePo4 idea months ago,  instead he's just acting with bad character and impeding the development of the DIY Hiface modding scene.

 

On a lighter note Jocko would be surprised that I am running my modded Hiface with an 18ft USB cable and it sounds great.


I have said this a hundred times - the mods I do, I posted on a number of forums that you frequent & you have also posted on these same threads asking questions so why are you making an issue of this? I bet you are using my pics to identify where to do your connections (& btw, DAN was correct your ground point is less than optimal;)

 

What's your beef - If people on't find my posts of benefit I'll leave - why don't you set up a poll or petition & I'll leave if that's what the consensus wants?

post #1596 of 1712



 

Quote:
Originally Posted by regal View Post


You can't solve these issues by theorizing about them to death.  You pull out the SPDIF spec read it and then you plug in an oscilloscope and go from there.  Its empirical (to the general audience look up that word please.)     This whole thing reminds me of the damn oil spill that the government agencies have spent over a month theorizing,  at some point you have to test.  If all you have is ears,  thats better than words!

 

 


 


Yes I understand all that and I do a great deal of hands on stuff also.  I was asking where you seen the information suggesting the Hiface does not follow the spec...

Of course at some point you have to test but you have to have an idea of what you are testing for and what you want to find out. 
 

post #1597 of 1712

@Jkeny, thanks for the links to the attenuators, I will have to pick up a few units and give them a try.

Now, correct me if I am wrong but you have not tried any experiements yet?

post #1598 of 1712

@jkeny

 

Yay! The mini-circuits link that you posted works for me now! 

This seems to be the right attenuator for the hiFace and my DAC according to Joseph K: http://www.minicircuits.com/cgi-bin/modelsearch?model=HAT-10-75&search_type=info

I wonder if you could get the same model with both Male BNC plugs.


Edited by punk_guy182 - 6/18/10 at 7:47am
post #1599 of 1712

I think the logical solution would be to lower the voltage supply to the DIT4192 digital transmitter,  read the datasheet it outputs max Vdd

 

 

http://focus.ti.com/lit/ds/symlink/dit4192.pdf

post #1600 of 1712

From the datasheet.  It looks like the Hiface is omitting the .1uf cap and the resistor is only 259 not 300 shown in the recommended schematic.  The pulse transformer appears to be correct.

 

I could be wong as I don't have ideal tips for measuring SMD,  but will investigate further.   I think the focus should be on the transmitting end not some hokey pokey attenuator.

 

TX.jpg


Edited by regal - 6/18/10 at 8:59am
post #1601 of 1712

Many designs will not follow a reference design from the chip manufacturer.  Most of this DIY improvments come from people experiementing and trying to improve things. You said it yourself that you have to test and not theorize....  There are still probably many mods that may improve the sound quality.  For the price of the attenuator, there is no reason not to give it a try for the sake of advancing the DIY options surrounding this unit.

 

Your approach may be another idea, as both try and accomplish the same goal which is to attenuate the output signal.


Edited by ROBSCIX - 6/18/10 at 9:30am
post #1602 of 1712

yea but I was wrong the output from the TX+ & TX- pins follow the datasheet exactly (I got out my microscope and small probes),  so  the oscilloscope is going to be the only way to figure out why this transmitter outputs over SPDIF spec.   Still think we get the transmitter working correctly and not have to add an attenuator is the best solution.,  but I'm looking for the cheapest fix.

post #1603 of 1712
Thread Starter 
Quote:
Originally Posted by soulrider4ever View Post

Hey,  I have the Matrix mini-i and just got my cheapo BNC to BNC male adapter from china, yes, it's probably 50ohms, but it looks like that 75ohm adapter someone else posted.  At any rate - the difference was rather significant over the BJC BNC cable I had purchased, the SQ has improved soundstage as well as the 'body' of the sound, I will definitely NOT be going back to a BNC cable as I am using a 6" USB extension cord that came with my patriot thumb drive.  IMO this was the absolute best $2 I have ever spent on my audio system. 

 

As far as all this bickering, guys, really?  Nobody cares.  We would like to keep this post on topic and talk about the converters not this he said, she said, wa wa wa, take all that to a PM please, because I really want my last 10 minutes back of trying to catch up on this thread and reading the important stuff :/ - like how can I the average Joe get better SQ.


Thanks for sharing your impressions soulrider4ever.

 

I also agree that it was hard going through the last pages. Could we please go back on topic.

For those who wish to further discuss which mods are more suitable for the hiface, I already started a separate thread (here: http://www.head-fi.org/forum/thread/483900/review-jkeny-s-modified-hiface).

post #1604 of 1712

Personally, I think from a design standpoint it is better to leave the signal as high as possible out of the HiFace and then experiment with different attenuator values.  If you modify the TX circuit you will set the output to one value and you will not be able to change it without using the soldering iron again.

 

Now, if yoiu used the attenuators and found the right value that gives the best result perhaps you could modify the hiface for this value.

 

I hope I am saying it right and again just theory and might not be possible.

post #1605 of 1712
Thread Starter 
Quote:
Originally Posted by regal View Post


On a lighter note Jocko would be surprised that I am running my modded Hiface with an 18ft USB cable and it sounds great.


Hi regal,

 

Have you compared your modded hiface to other transports? Did you notice any change in sound with the stock hiface after the burn-in period?

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Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › USB to SPDIF converters shoot-out : EMU 0404 USB vs. Musiland Monitor 01 USD vs. Teralink-x vs. M2Tech hiFace