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Brief Odac impressions - Page 85

post #1261 of 1960
Quote:
Originally Posted by mnarwold View Post

I'm finding the ODAC a very intriguing little device, but I have some questions. I've done some searching and reading (although I only read about the first 20 pages of this thread, so if the answer is there, I apologize), but I haven't found the answers.

 

Is the ODAC asynchronous?

 

 

 

 

It is not.

post #1262 of 1960

Can anyone comment on the ODAC that has used the Alien DAC v1.1 before?  I'm considering upgrading, but would like to know their relative performance pros/cons.  

post #1263 of 1960
Quote:
Originally Posted by hamburgerladdy View Post

 

 

It is not.


Thanks for the info. Apparently people don't think it makes that big a deal since they're rating it higher than dacs that do have asynchronous.

post #1264 of 1960
Quote:
Originally Posted by mnarwold View Post


Thanks for the info. Apparently people don't think it makes that big a deal since they're rating it higher than dacs that do have asynchronous.
I think in one of the original blog posts about the odac he describes why it doesn't need to be asynchronous. I think he may go into depth as to why it isn't super important
post #1265 of 1960

Basically, the argument against asynchronous USB is that it is not required for reducing jitter to inaudible levels, and chips that support it would currently require proprietary drivers on Windows (in addition to there being fewer choices at higher prices, and more restrictive licensing).

post #1266 of 1960

No its not asynchronous....

 

Alex

post #1267 of 1960
I have an odac/amp unit and was wondering if the amplification of the amp will distort external speakers. Basically is there a volume setting or switch on the device that bypasses the internal amp? Or do I have to just buy an odac by itself for that purpose? I have the headphone out connected to a pair of audio engine 5's and the odac/amp sounds like crap. This is connected to powered USB hub running foobar in wasapi mode.
post #1268 of 1960

The O2 does not really distort the sound in an audible way if you set the gain and volume correctly for using it as a line buffer. Ideally, you would want 1x gain and maximum volume. If you do not have 1x gain, and do not need 6.5x (it normally should not be used with the ODAC, unless you control the volume on the PC), then it is possible to turn the 6.5x gain mode into 1x by clipping two resistors. With the default 2.5x gain, you may need to reduce the volume so that the output voltage of the O2 does not cause clipping in the input stage of your speaker amplifier.

post #1269 of 1960
Quote:
Originally Posted by stv014 View Post

it normally should not be used with the ODAC, unless you control the volume on the PC

Just to be clear, that includes using a subtractive EQ, Replaygain, and generally any DSP that reduces volume.
post #1270 of 1960

I meant that setting the 6.5x gain with the ODAC requires lowering the volume on the PC, because otherwise the 6.5 * 2 = 13 Vrms full scale voltage will cause the gain stage of the O2 to clip. But using the high gain normally only makes sense to get the last few dB of power out of very hard to drive headphones, or if the digital signal played is very quiet and never gets even close to 0 dBFS.

post #1271 of 1960
Quote:
Originally Posted by mnarwold View Post

I'm finding the ODAC a very intriguing little device, but I have some questions. I've done some searching and reading (although I only read about the first 20 pages of this thread, so if the answer is there, I apologize), but I haven't found the answers.

 

Is the ODAC asynchronous?

I've read that it out performs the hrt msii and some people say it even is better than the msii +, but has anyone compared it to the hrt headstreamer?

Has anyone read how this compares to the Musiland Monitor 02/Dragon US?

 

I have the Headstreamer and am looking for an upgrade, but wouldn't want to spend the money on the dac and an amp if the audible sq gain is only minimal.

I'm using woody Grado 225i.

 

Thanks

Matt
 

It's not async

 

I don't think you'll hear much of a difference given your headphones, to be honest. Even with more resolving headphones.. You probably wouldn't hear much of a difference, but if you want to upgrade, go for it.

post #1272 of 1960
Quote:
Originally Posted by stv014 View Post

The O2 does not really distort the sound in an audible way if you set the gain and volume correctly for using it as a line buffer. Ideally, you would want 1x gain and maximum volume. If you do not have 1x gain, and do not need 6.5x (it normally should not be used with the ODAC, unless you control the volume on the PC), then it is possible to turn the 6.5x gain mode into 1x by clipping two resistors. With the default 2.5x gain, you may need to reduce the volume so that the output voltage of the O2 does not cause clipping in the input stage of your speaker amplifier.

R19 and R23 are the resistors you clip to drop the gain :)

post #1273 of 1960

mnarwold...

 

I have the HRT MSii and HRT MSii + and the ODAC.

 

Comparing them they all sound very good....it would be hard to tell them apart...

 

Alex

post #1274 of 1960
Quote:
Originally Posted by adydula View Post

mnarwold...

 

I have the HRT MSii and HRT MSii + and the ODAC.

 

Comparing them they all sound very good....it would be hard to tell them apart...

 

Alex


Thanks for the info. I'm taking the leap and selling my head streamer and getting the ODAC and probably the O2, but I'm not totally decided on the amp yet. I wish it were dual voltage. I'll have to pay a little extra and get a power converter since I do a lot of traveling.

post #1275 of 1960

Fyi...

 

The only real difference that I have noticed is the HRT USB dacs have a higher output voltage...ie some say this is running 'hotter' so when you do a compairison

it seems like there is a difference but if you level match the volumes the differences dissappear...I wish I had a dime for the number of times I have gone back and forth between

these dacs.....they all are really good....and then when you consider the price...its almost a no brainer....

 

Good luck in your choice!

 

Alex

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