Head-Fi.org › Forums › Equipment Forums › Computer Audio › Audiophilleo 1 and 2 USB to S/PDIF transport
New Posts  All Forums:Forum Nav:

Audiophilleo 1 and 2 USB to S/PDIF transport - Page 52

post #766 of 1185
Quote:
Originally Posted by Trogdor View Post


I just bought one (w/PP) from a fellow Head-Fier (upgrading my hiface).
Plan to use it through my JH3A system. This is suppose to be my reference end-game like system.
I am hoping I have a similar wow effect. We shall see.

I use the ap2 without the pp upgrade with my JH3a,with good results,I just pickjed up a Aqvox but have not tried it yet.

I look forward to your impressions with the PP. I am on the fence about sending in my AP2 for the pp ugrade.

post #767 of 1185
Quote:
Originally Posted by bozebuttons View Post

I use the ap2 without the pp upgrade with my JH3a,with good results,I just pickjed up a Aqvox but have not tried it yet.
I look forward to your impressions with the PP. I am on the fence about sending in my AP2 for the pp ugrade.

I was wondering bozebuttons what you were feeding your JH3A, now I know!

Have you compared the AP2 with other USB DACs?

Cheers!
post #768 of 1185
Quote:
Originally Posted by Rdr. Seraphim View Post

I couldn't wait and ordered the Vaunix; it arrives this Thursday. cool.gif "Technically," it should make no, nada, zero, difference, at least based on Phillip's explanation. I plan to power the Vaunix via the BPT 3.5 Signature balanced isolation transformer. I believe the primary benefit will be different ground potentials and hence improved isolation? We'll see... 

 

With a linear supply I hope? With the wall-wart the Vaunix is likely to get no benefit from the BPT. The only positive would be removing the harmful effects of said wall-wart from the rest of the circuit.

post #769 of 1185

BTW, 6moons posted all the schematics required in order to hook up a clean PSU to a USB cable: http://www.6moons.com/audioreviews/kingrex12/1.html

 

It very much works, and it's done wonders on my rig normal_smile%20.gif

post #770 of 1185

Truthfully, I don't know what type of a PS the Vaunix uses, but I'm hoping--for the price--that it is a linear.  

  

Quote:
Originally Posted by DaveBSC View Post

 

With a linear supply I hope? With the wall-wart the Vaunix is likely to get no benefit from the BPT. The only positive would be removing the harmful effects of said wall-wart from the rest of the circuit.

post #771 of 1185

Peripherally related, but DaveBSC piqued my interest in the Vaunix power supply. Here's some additional information from the Vaunix designers via http://jplay.eu/forum/computer-audio/clean-usb-out-of-pc/

 

"This hub is designed to provide the lowest DC noise performance with the best data transfer possible. A few things we did with design that are somewhat unique:

1.  Most hubs use a 5V switching power supply to drive the ports which can be very noisy. The Lab Brick powered  hub ships with a 12V wall-wart. The 12 volt input to the hub allows us to use internal voltage regulation resulting in much cleaner power supplies for the internal circuitry and for the down stream ports. 

2.  We use separate power supply and digital grounds. The grounds are both physically and electrically separated which prevents ground loops and prevents noise coupling. The housing is all metal which eliminates any noise due to EMI.

3.  The data lines on the PC board are matched to a balanced 90 ohms impedance. The best cables in the world won't help you if the data lines are not properly matched on the PCB. The use of balanced, properly matched lines provides common-mode rejection of noise resulting in a cleaner output.

4.  All of the ports provide short circuit protection to any device plugged into the hub.   

There has been a question if isolated hubs are beneficial. We think it may restrict the sound fidelity due to bandwidth constraints.  Isolating the data lines precludes the hub from running in high speed mode (480MB/s). The opto-isolators used in isolated hubs limit the data transfer rate to full speed mode (12MB/s). It's our suspicion this causes the reduction in dynamic range for the audio world.  I haven't done the math to prove it – just a suspicion."

---------------------------------------

and in response to another forum post:

---------------------------------------

 

"One more post from me on the Vaunix hub and then I'll leave it to you experts!

 

Your analysis of my post is very good and generally correct. The power supply technology that we are using was developed to be used with our signal generator products. Signal generators are extremely sensitive to power supply noise. Any noise on the power lines (or grounds) results in degradation of phase noise, jitter and spurious performance. The simple explanation that we minimize the pulsing ground currents associated with typical power supplies and follow that with some serious filtering is kind of an understatement.

I would still argue that isolating the data lines is unnecessary in this hub design. I can understand the use of opto-isolators on other devices with less sophisticated ground/power design, but you still lose the High Speed data capability. Now if you plan on seeing 1kV spikes on the lines I might change my mind… 

I can't claim to have any specific knowledge of the EMI performance inside the enclosure. I have to believe there will be far less EMI generated in the hub then would be inside an amp. If anyone happens to try this experiment with a Vaunix hub please let me know.  I can even mail you a new label to make it look new again after the test.

In my opinion, and as you suggest, minimizing reflections is a big part of the success of using a Vaunix hub in the audio world. It's easy to match a device to 90 ohms at 500 kHz, but it's another thing all together to do it correctly so it is matched at 2 GHz. I realize we are not passing data at 2 GHz, but you may be surprised at the importance of matching well above the intended operation frequency can be in relation to rolling off edges at lower frequencies. This is another area where it pays to have good RF design engineers contributing to this product."

post #772 of 1185
Quote:
Originally Posted by Rdr. Seraphim View Post

Truthfully, I don't know what type of a PS the Vaunix uses, but I'm hoping--for the price--that it is a linear.  

  


It's a 12V, 24W wall-wart. They use internal DC-DC regulation to try and clean it up, but a 2 amp linear supply from Hynes or Bolder cables would likely still sound better.. though it would of course add considerable cost. Unfortunately the AP and PP still use a small amount of Vbus power, so the power line can't be cut entirely with something like the Empirical Short Block.

post #773 of 1185
Quote:
Originally Posted by DaveBSC View Post

It's a 12V, 24W wall-wart. They use internal DC-DC regulation to try and clean it up, but a 2 amp linear supply from Hynes or Bolder cables would likely still sound better.. though it would of course add considerable cost. Unfortunately the AP and PP still use a small amount of Vbus power, so the power line can't be cut entirely with something like the Empirical Short Block.

 

Here?: http://www.paulhynesdesign.com/page7.html

 

I'm not seeing any 2 amp supplies.  The Bolder ones are $600-900, which is frankly insane.

post #774 of 1185

Got my purepower thanks to A2A for shipping so fast.  Man the AP2 is tiny, I was expecting something twice as big.  Build quality of the purepower is a little disappointing though - the battery is not fixed properly and rattles around.

 

As for sound its a moderate upgrade from the JKSPDIF mk3, more refined but with better timing and detail, more cohesive but also a little more forward because of this which is possibly why people could call the soundstage smaller.  It is slightly more musical the the JKSPDIF in my system too, I no longer have to cringe on some cymbal hits or trumpet parts.

 

It is not however immune to computer performance and timing - KS in JRiver sounds much better than Event Wasapi, and you need to manage buffer size otherwise you will get glitches and dropouts.  The JKSPDIF is easier to set up in this regard - probably because it just accepts whatever timing variances the computer throws at it rather than having to manage a proper buffer.  I would not be surprised if USB cabling had an influence up to a certain point as well, given my experiences with streaming methods.

post #775 of 1185
Quote:
Originally Posted by drez View Post

Got my purepower thanks to A2A for shipping so fast.  Man the AP2 is tiny, I was expecting something twice as big.  Build quality of the purepower is a little disappointing though - the battery is not fixed properly and rattles around.

As for sound its a moderate upgrade from the JKSPDIF mk3, more refined but with better timing and detail, more cohesive but also a little more forward because of this which is possibly why people could call the soundstage smaller.  It is slightly more musical the the JKSPDIF in my system too, I no longer have to cringe on some cymbal hits or trumpet parts.

It is not however immune to computer performance and timing - KS in JRiver sounds much better than Event Wasapi, and you need to manage buffer size otherwise you will get glitches and dropouts.  The JKSPDIF is easier to set up in this regard - probably because it just accepts whatever timing variances the computer throws at it rather than having to manage a proper buffer.  I would not be surprised if USB cabling had an influence up to a certain point as well, given my experiences with streaming methods.

Maybe there is something wrong with yours, mine does not rattle at all.
Maybe got loose during shipping?
In my system and I say mine because all systems are different , the soundstage got
A whole lot better with the pure power. Who knows why but it did without a doubt .
Hope u enjoy your as much as I am mine.
post #776 of 1185

Yeah could have come loose - haven't opened it up to see how it is fixed inside.  I think the soundstage can seem smaller because the room is given more definite edges whereas with other converters like the JKSPDIF the room acoustics and images are not as vivid.

post #777 of 1185
Thread Starter 
Quote:
Originally Posted by DaveBSC View Post

Quote:
Originally Posted by Rdr. Seraphim View Post

Truthfully, I don't know what type of a PS the Vaunix uses, but I'm hoping--for the price--that it is a linear.  

  


It's a 12V, 24W wall-wart. They use internal DC-DC regulation to try and clean it up, but a 2 amp linear supply from Hynes or Bolder cables would likely still sound better.. though it would of course add considerable cost. Unfortunately the AP and PP still use a small amount of Vbus power, so the power line can't be cut entirely with something like the Empirical Short Block.

 

I have mine plugged into a noise filter, incidentally. I'm thinking of buying or building some Sigma 22 PSUs or similar for powering things such as the Vaunix Hub, my ULN-2 and other equipment though to see if it makes any difference.

post #778 of 1185
Quote:
Originally Posted by sridhar3 View Post

 

Here?: http://www.paulhynesdesign.com/page7.html

 

I'm not seeing any 2 amp supplies.  The Bolder ones are $600-900, which is frankly insane.


Paul makes a ton of different models that aren't pictured or listed on his site, you just have to ask him what a 12V, 2A supply would cost. The Kingrex PSU MK2 has a 48VA transformer which is plenty for the Vaunix, Moon Audio carries it for $420.

post #779 of 1185

We'll see how far the Vaunix takes the PP/AP combination. Frankly, I'm thinking we are very close to the limits of the AP1/2 and PP design. Phillip would need to head back to drawing board, especially on the power supply side, to do appreciably better. Still, at this price point, it makes music much more enjoyable! 

Quote:
Originally Posted by DaveBSC View Post


It's a 12V, 24W wall-wart. They use internal DC-DC regulation to try and clean it up, but a 2 amp linear supply from Hynes or Bolder cables would likely still sound better.. though it would of course add considerable cost. Unfortunately the AP and PP still use a small amount of Vbus power, so the power line can't be cut entirely with something like the Empirical Short Block.

post #780 of 1185
Quote:
Originally Posted by Trogdor View Post


I was wondering bozebuttons what you were feeding your JH3A, now I know!
Have you compared the AP2 with other USB DACs?
Cheers!

No I have not tried any other usb dacs,but I do use my Jh3a with my Ibasso Dx100 with a moon audio black dragon coax cable for portable use.

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Computer Audio
Head-Fi.org › Forums › Equipment Forums › Computer Audio › Audiophilleo 1 and 2 USB to S/PDIF transport