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O2 AMP + ODAC - Page 115

post #1711 of 3666
Well for one it's way too loud for sensitive headphones when the potentiometer is past the channel imbalance region.
post #1712 of 3666

What sensitive headphones??

 

And how does that equate to a detrimental listening experience?

 

A.

post #1713 of 3666
Pretty much any earphone, some portable headphones like the V-MODA M-100, and even with the K 701 it's too loud for me on 1.0x gain. I have to lower the digital volume when I use the O2 and want to listen to music at a low volume level.

I can't really enjoy listening to music if it's too loud for me. wink.gif
post #1714 of 3666
Quote:
Originally Posted by miceblue View Post

Well for one it's way too loud for sensitive headphones when the potentiometer is past the channel imbalance region.

 

Please explain the channel imbalance region?   Curious to know as i remember reading something about 12 o'clock being the optimum position.

 

And does 1x gain no satisfy the needs for sensitive headphones (what i use for Grados), or are you talking about IEM's?

post #1715 of 3666
Quote:
Originally Posted by mcandmar View Post
 
Quote:
Originally Posted by miceblue View Post

Well for one it's way too loud for sensitive headphones when the potentiometer is past the channel imbalance region.

 

Please explain the channel imbalance region?   Curious to know as i remember reading something about 12 o'clock being the optimum position.

 

And does 1x gain no satisfy the needs for sensitive headphones (what i use for Grados), or are you talking about IEM's?

The channel imbalance region is the part of the volume potentiometer that produces audio, but the left and right channels are at different volume levels (i.e. the left channel is louder than the right channel). At around the 9 o'clock position, the channel imbalance disappears. I don't actually know if this happens to all potentiometers, but it seems to be common in audio products for some reason.

 

1.0x gain should be plenty for sensitive headphones in general. Even with the fairly insensitive Mad Dog headphones I never had to go past the 12 o'clock position to get a sufficiently loud volume level at 1.0x gain.

post #1716 of 3666

Interesting, thanks for that.  Good to know as i only ever use the 9,10,11 o'clock position with 1x gain and Grados, and the same three positions with 2.5x gain for the Sennheisers.

post #1717 of 3666
Quote:
Originally Posted by miceblue View Post

The channel imbalance region is the part of the volume potentiometer that produces audio, but the left and right channels are at different volume levels (i.e. the left channel is louder than the right channel). At around the 9 o'clock position, the channel imbalance disappears. I don't actually know if this happens to all potentiometers, but it seems to be common in audio products for some reason.

1.0x gain should be plenty for sensitive headphones in general. Even with the fairly insensitive Mad Dog headphones I never had to go past the 12 o'clock position to get a sufficiently loud volume level at 1.0x gain.
Not all. It's not an issue with digital pots but all analog pots do, it just varies in how bad it can get depending on quality of said pot.
post #1718 of 3666

For 99% of us this is not a real issue at all.

 

None of the headphones I use are listened to at less than a nine o'clock position....below nine o'clock would be low fi to me....lol.

 

 

So what are the real audio deficiencies with the O2 amp???

 

Alex

post #1719 of 3666
Quote:
Originally Posted by adydula View Post

For 99% of us this is not a real issue at all.

None of the headphones I use are listened to at less than a nine o'clock position....below nine o'clock would be low fi to me....lol.


So what are the real audio deficiencies with the O2 amp???

Alex
How does pot position equate to being low/mid/hi-fi? confused.gif That just means that's how sensitive they are. IEMs are typically the ones with channel imbalance issues since they're in your canal and doesn't take a lot to drive them...
post #1720 of 3666
The less pot you have, the less high-fi it is. wink.gif
post #1721 of 3666

Dont use iem's they to me are really a compromise compared to normal headphones....

 

With headphones I never listen to anything below 9 oclock on the O2.

Ususally between 9 pm and Midnight....lol

 

Listening at very low levels with headphones the volume is so low the sound is just not very realistic to me....just not enjoyable at all....so this to me is low-fi.

 

When I listen i do so with enough amplitude to make the experience enjoyable to me without hurting my hearing/ears...

 

If I used IEM's I might be concerned about ch imbalance....but to me its not an issue at all.

 

I played tones and listened at very low levels and dont really hear any imbalance with both of my O2's..

 

I still find the overall capabilites of the O2 to far outweigh any possible ch imbalance issue.

 

Alex

post #1722 of 3666
Quote:
Originally Posted by adydula View Post
 

Dont use iem's they to me are really a compromise compared to normal headphones....

 

I played tones and listened at very low levels and dont really hear any imbalance with both of my O2's..

 

Alex

Well I'm guessing they're called In-Ear Monitors for a reason. I don't use them because they're uncomfortable for me. XD

 

And the channel imbalance seems to happen to pretty much all analogue potentiometers in audio gear. JDS Labs measured the channel imbalance for the O2. The lack of channel imbalance in their C5 amp is why I tend to use that over the O2 since I can comfortably listen to music at a sufficiently low volume.

post #1723 of 3666

I've had this piece of gear for a long time and really like it. Wrote a review on this thread for anyone interested:

 

http://www.head-fi.org/t/684861/audinst-hud-mx2-vs-odac-o2-vs-graham-slee-bitzie-a-few-portable-dac-amps 

post #1724 of 3666

Hey O2/ODAC owners!

 

I am a big fan of the HRT Microstreamer, which I own, and have heard some people say that it can rival full-size amp/dac combos. Personally I am very curious about this, but I don't have anything to compare it to. I do know that it sounds great, much better than any of my mobile sources or the cheaper DACs I've tried (ELE DAC, Hifimediy Saber), so I am willing to bet it could hold its ground.

 

So, I'm curious if any ODAC/O2 owners in LA would be interested in meeting up at a coffee shop or the like to compare and see if the little HRT can match up to the O2/ODAC combo. I have the HD650 and a Beyer DT770 LE 32 ohm for use in the comparo. I have a Schiit Asgard too; if anyone is interested in comparing it to the O2 I would gladly bring it along :)

 

The gauntlet has been thrown down! :cool: 

 


Edited by Gilly87 - 10/10/13 at 11:30am
post #1725 of 3666

Wish you were on the east coast, be happy to play and compare.

 

I do have a HRT MSii+ Asynchronous USB DAC and the ODAC and it are very close, hard to tell any real world difference.

 

Alex

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