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Musiland "Digital Times" 24/192 PCI card (digital output only) - Page 3

post #31 of 55
Originally Posted by glt View Post

if your Musiland was built from another batch of the oscillators, it could be better than mine :-)

 

or worse for that matter

 

and the SQ in analog was terrible on the 02US in "fast" mode, I don't think the only difference was the sample rate accuracy?

 

and did you try to measure the voltage of the coax output? 0.2V? 0.5V?

 

Originally Posted by glingrem View Post

can you hear this  speed difference?

 

I don't know, I will try resampling some songs at 44105 Hz


Edited by leeperry - 6/1/10 at 11:18am
post #32 of 55


 

Quote:
Originally Posted by leeperry View Post

 

or worse for that matter

 

and the SQ in analog was terrible on the 02US in "fast" mode, I don't think the only difference was the sample rate accuracy?

 

and did you try to measure the voltage of the coax output? 0.2V? 0.5V?

 

 

I don't know, I will try resampling some songs at 44105 Hz

 

I answered your query in the blog...

 

I didn't measure the coax output, but since I modded a mini, I can adjust the voltage at will because I can change the resistor. I think I chose a value that will give me .5-1v levels...
 

post #33 of 55
Originally Posted by glt View Post

I answered your query in the blog

 

thanks, I just did too

 

Originally Posted by ironmine View Post

Musiland 01USD has an RCA output which is 90 Ohm instead of standard 75 Ohm?

 

RCA cannot be 75Ω AFAIK, and for BNC it seems to be highly debatable: http://hifiduino.wordpress.com/2010/03/30/some-audio-wisdom/

 the impedance mismatch problem at the connector is academical

Edited by leeperry - 6/1/10 at 1:28pm
post #34 of 55

Hi leeperry, I need to make a correction.

 

The ppm specification is temperature stability. The frequency accuracy is not really specified.

 

However one can assume that for a crystal specified at 25.576 MHz, any variation in the last 3 significant digits is permitted. Say 25.576499 MHz still qualifies as a 25.576 MHz part. Thus 500 Hz of variation constitutes 20 ppm.

 

On top of that you add the frequency variation from the value at measured temperature to the value at operating temperature. Lets say it was measures at 25C and you run your DAC at 45C. That could be another 10-20 ppm for a 100ppm part

 

And then there is aging: 3 ppm the first year.

 

The 22.5792 part is better because the maximum variation from spec is 50 Hz which is only 2 ppm

 

Of course this is just theory. There maybe other contributing factors beyond the crystal/clock

post #35 of 55

hehehe, ok a lot of assumptions need to be made...that's the nice thing about your test, it shows the real world performance of the clocks. Too bad you can't run it on the Hiface

 

We all know that many companies will tell you whatever bs to sell their products...I've seen some jitter measurements where the Hiface was very close to the top-range Lynx soundcards so M2tech might be right from start to end, but anyway this test wouldn't hurt

post #36 of 55
Thread Starter 
Quote:
Originally Posted by leeperry View Post

Well, this adapter avoids using a coax cable...so no interferences and no cable attenuation.


Do you think a BNC cable terminated with such adapter will retain its noise-rejection properties?

post #37 of 55
Thread Starter 
Quote:
Originally Posted by leeperry View Post
do you have a link to that test please? did he also try the BNC output?


www.diyhifi.org/forums/viewtopic.php?f=2&t=1889

 

www.audioasylum.com/forums/pcaudio/messages/6/66884.html

post #38 of 55

lol your last link looks scary

 

but was it done using the "high precision" mode? I believe those drivers were released early 2010.

 

I will also try this adapter: http://www.uauctionsource.com/picture/SKU004912_0.jpg

 

I dunno how good they could sound...I just know that there's a new S/PDIF transport that doesn't need a coax cable, you plug it directly onto your DAC: http://www.audiophilleo.com/audiophilleo1.aspx

 

and here Patrick82 goes OMG on those adapters: http://www.exeres.org/audio.htm

 These beat all the reference interconnects in the whole world

 

anyway, if I don't like the 01USD I'll just get an HiFace and still use that RCA/RCA adapter...can't be bothered w/ useless pricey coax cables

post #39 of 55
Quote:
Originally Posted by leeperry View Post

 RCA cannot be 75Ω AFAIK, and for BNC it seems to be highly debatable: http://hifiduino.wordpress.com/2010/03/30/some-audio-wisdom/

Impedance of connector depends on the design, in particular the diameter of the inner contact and material of insulator, so there is no difference between RCA and BNC when its dimensions are same.

 


Edited by glingrem - 6/5/10 at 4:50am
post #40 of 55
Quote:
Originally Posted by leeperry View Post

 

I will also try this adapter: http://www.uauctionsource.com/picture/SKU004912_0.jpg

And change one pair of contacts to two pair. What are reasons?

You can use "right design" RCA (silver+teflon) and forget about this problem

 


Edited by glingrem - 6/5/10 at 4:51am
post #41 of 55

the reason is "the best cable is no cable"

 

they use the same adapter on this thing: http://www.audiophilleo.com/audiophilleo1.aspx

 

post #42 of 55
Quote:
Originally Posted by leeperry View Post

the reason is "the best cable is no cable"

 

Yes, You right, but thinking about the mechanical load on the pins in such connection

 

post #43 of 55

I will use an elevation "step" to make sure that the unit fits nicely into the DAC...the RCA pin won't have to stand the weight of the 01USD module...no worries

 

BTW, if you read this link in full...at the end the ppl seem pretty happy w/ the 01USD: http://www.audioasylum.com/cgi/t.mpl?f=pcaudio&m=66884

 

and that was even before the "high precision" drivers!

post #44 of 55
Quote:
Originally Posted by leeperry View Post

I will use an elevation "step" to make sure that the unit fits nicely into the DAC...the RCA pin won't have to stand the weight of the 01USD module...no worries

 


But be ready to shoot anyone who caught the USB cable
 

post #45 of 55

no worries! the USB cable will be duct-taped to the back of the computer stand and the USD and its elevation thingie will be taped to the DAC...I've learned from the best: http://thereifixedit.com/

 

I've watched all the pics on that site, and now my brain bubbles w/ DIY kludges

 

TIFI-RoofRack


Edited by leeperry - 6/5/10 at 4:50pm
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