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Brief Odac impressions - Page 77

post #1141 of 1960
Quote:
Originally Posted by xzobinx View Post

I understand that it's not designed to be balanced but Is there a way to wire the line-out socket from the board to 3 pin xlr (I'm noob when it comes to DIY ). It's pointless on the paper but I just want to try.

 

You need to connect the output (L or R) to pin 2 of the XLR connector, and the ground to pin 3. Also connect the ground to pin 1, but under certain circumstances this may be unneeded (if there is already a ground connection between the devices through some other path).

post #1142 of 1960

I pinched gkanai's ODAC for a bit of a listening test and have been giving it a bit of a run with my DIY O2 (which uses the NE5532 as I can't get the other opamp from Mouser). The sound is very clear as I expected, with my Symphones Magnums. I'd prefer listening with it over the Apogee Duet II I had here before. Like every Sabre-based DAC I've tried, such as the Dragonfly, I feel the sound is a bit dry. It's not threatening my high-end rig in any way, but like many others have already said, it's impressively good. I totally understand anyone who feels that the combo is all they need to enjoy music, as in the absence of what I own now, I could have easily have ended up feeling the same way.

post #1143 of 1960

One thing that always kind of bothered me with the ODAC is that it's totally usb powered, no mains power. This is good and bad depending on how you look at it. It's good for convenience but bad for performance, or at least theoretically. The usb power from our computers is dirty and not ideal for audio streaming, or so I've read. I used to own a Fiio E17 which i used through usb on my laptop and there was always static noise and interference which was sometimes caused by my usb mouse. Or maybe my laptop just has bad usb ports.

 

I ordered the ODAC a few days ago along with a powered usb hub off Amazon today. The powered hub should help here.

 

Does anybody have any bad experiences with the ODAC which may be caused by insufficient or dirty power? It doesn't seem to be common but it still bugs me.

post #1144 of 1960

The ODAC was designed to be used with USB power and the world class spec measurements were attained while using USB power.

 

There are lots of opinions on this and many will be glad to share them I am sure.

 

The ODAC was designed specifically with this in mind as one of the design points that is what you dont need to have .....to have DAC audio happiness...that is your DAC simply disappearing from the signal chain...

 

If you seach for the designers site you will find a list of things that are not needed according to him for audio excellence.

 

One of these is no need for eloborate and or high current power supplies...

 

I personally have tried this ODAC on several pc systems from IBM, Lenovo, Dell, Acer notebooks...with USB 2.0 and USB 3.0 ports.

 

I also tired it off of (2) USB powered buss's and several desktop systems, from Gateway, IBM, Lenovo, and (3) homebuilt pcs with boards from ASUS, EVGA,

 

I also measured the actual current draw with the ODAC in use....and staticly....the current draw doesnt come close to taxing most USB PC power sources....well under the 500 ma spec. 

 

Also the USB cables I use have a ferrite bead for filtering of any HF crap that might get induced on the cable...and the ODAC also has a ferrite on the dac board as well...

 

The designer in his site has stated that USB power often degrades performance due to noise.

 

The design of the ODAC uses a split digital filter and analog power supplies each with their own filtering and regulation which can be seen by looking at the schematic that is now available on the web. 

 

That said try and listen yourself and see if you can really hear any real world differences in using USB power vs a powered buss etc..

 

All the best

Alex


Edited by adydula - 11/2/12 at 7:05am
post #1145 of 1960

Thanks for the very informative post. I may actually go ahead and cancel my usb hub order and save some money.

 

I'll see how it performs when it arrives straight from my laptop, if i detect problems then i'll probably purchase the hub.

post #1146 of 1960
Quote:
Originally Posted by beaver316 View Post

The usb power from our computers is dirty and not ideal for audio streaming, or so I've read. 

 

It's true. USB power is dirty. Line ("mains") power is dirty. There's noise everywhere in every electrical circuit. It's inescapable. A designer's goal is to reduce that noise until it's inaudible.

 


Quote:
Originally Posted by beaver316 View Post

Does anybody have any bad experiences with the ODAC which may be caused by insufficient or dirty power? It doesn't seem to be common but it still bugs me.

 

There are reports which I find credible: If insufficient power is available through the USB bus, the ODAC performs poorly.

 

Dirty power? You can read about "PSRR", etc., but the details are above my head.

post #1147 of 1960

If insufficient power is available through the USB bus, the ODAC will perform poorly?

 

Well....yeah....as well as many other USB devices....

 

Define what insufficient power is for the ODAC please?

 

Most issues with USB power is people not understanding the USB specs, the current that the USB supply can source.

In USB 2.0 specs its 500ma. You can do the math,

 

power = volts x amps in a DC circuit.

 

Most issues have people plugging in too many things (usb devices) into a pc on a single bus...

 

So you get a powered USB hub if its really needed etc..

 

Now-a-days with most pc's you have more and more integrated function inside the box that this situation is less and less in reality.

 

Most folks are simply wasting there money on a powered hub....but again try it without one and see if you have ANY issues at all.

 

You can always get one later.

 

Alex

post #1148 of 1960

I'm thinking about buying the O2+ODAC but I have a few questions. If I want to use the ODAC section, the only way to use it is through the USB, correct? Also, if I use the jack in the front of the unit, is the ODAC section disabled? Finally, is there anyway to connect a CD player to the ODAC section using RCA with an adapter?

 

Thanks!

 

Nicolas
 

post #1149 of 1960
Quote:
Originally Posted by slingshot View Post

I'm thinking about buying the O2+ODAC but I have a few questions. If I want to use the ODAC section, the only way to use it is through the USB, correct? Also, if I use the jack in the front of the unit, is the ODAC section disabled? Finally, is there anyway to connect a CD player to the ODAC section using RCA with an adapter?

 

Reference the downloadable O2+ODAC instructions.

 

1. The only input on the ODAC is USB.

 

2. If the O2's analog jack is connected, the ODAC is bypassed.

 

3. There are no TOSLink, S/PDIF, or other ODAC inputs other than USB. (What output connections does your CD player have?)

post #1150 of 1960

Thanks for the reply.

post #1151 of 1960
Quote:
Originally Posted by slingshot View Post

I'm thinking about buying the O2+ODAC but I have a few questions. If I want to use the ODAC section, the only way to use it is through the USB, correct? Also, if I use the jack in the front of the unit, is the ODAC section disabled? Finally, is there anyway to connect a CD player to the ODAC section using RCA with an adapter?

 

Thanks!

 

Nicolas
 

Only USB in. I have no idea what the second question is asking... I also have no idea what the third question is asking.

post #1152 of 1960
Quote:
Originally Posted by Currawong View Post

I pinched gkanai's ODAC for a bit of a listening test and have been giving it a bit of a run with my DIY O2 (which uses the NE5532 as I can't get the other opamp from Mouser). The sound is very clear as I expected, with my Symphones Magnums. I'd prefer listening with it over the Apogee Duet II I had here before. Like every Sabre-based DAC I've tried, such as the Dragonfly, I feel the sound is a bit dry. It's not threatening my high-end rig in any way, but like many others have already said, it's impressively good. I totally understand anyone who feels that the combo is all they need to enjoy music, as in the absence of what I own now, I could have easily have ended up feeling the same way.

 

Apogee Duet II is over $500 and ODAC + O2 is cheaper than that. It really makes me feel more confident to buy an ODAC. Thanks Jdslabs for making cheap products but with good and acceptable quality when comparing to other manufactures.

 

Thanks, Currawong. If you gave it positive impression then ODACs are approved by Currawong, one of the best audio head-fi members that I have known.

post #1153 of 1960

Could someone tell me the length of the usb cable bundled with the odac? There is no reference to this on jds labs site.

post #1154 of 1960

Its about 3 feet  / 1 meter i think...at work but not unusually long....

I will measure later at home.

 

Alex
 

post #1155 of 1960
Quote:
Originally Posted by beaver316 View Post

Could someone tell me the length of the usb cable bundled with the odac? There is no reference to this on jds labs site.

 

It's about 3'. My ruler is packed away for moving, but it's not more than an inch or so either way.

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