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Review: JDS Labs O2 (Black edition) + O2/ODAC discussion - Page 5

post #61 of 296
1/4/13 at 10:56am

That pop is the amp shutting itself off, basically.

 

I usually get a kind of "bump" and then just silence until I plug it back in. Nothing scary.

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post #62 of 296
1/4/13 at 11:54am

This isnt any small inaudible thing,...its a very loud pro-nounced popping that I believe is moving the element in the cans to extremes....I avoid it now by not letting the batteries run down!! keep the ac adapter plugged in....if i use batteries only then i only do it for a hour or so etc..

 

Alex

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post #63 of 296
1/5/13 at 10:25am
Thread Starter 
will have to check this. But I think the newer ones may not have this problem.
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post #64 of 296
1/5/13 at 11:04am

Any of you folks tried the UCA202 with the O2?  I believe wavman tested and measured it with good results.  I've had mine for years and use it as a usb to spdif converter as well as a dac.  I'll try it out when my O2 arrives which should be Mon. or Tues.  For $29 it's a steal...

 

Cheers!!!

 

 

 

400

 

 

 

400

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post #65 of 296
1/5/13 at 1:10pm
Quote:
Originally Posted by willmax View Post

Quote:
Originally Posted by adydula View Post

ok random...didnt mean to put you on the 'spot'....smily_headphones1.gif

My O2 i bought frm JDS started 'blipping' last night....shocked the heck out of me.....was using my Grado 325is...and it was really a loud popping sound....i immediately powered off the O2.

This was that battery low warning thing.....i never got this low before...put the ac adapter in and popping gone, charge overnight and all is good.

But this poping to me seemed quite 'violent' with these Grados....must be listening louder than i think.....

Alex

I've also had this popping noise and it scared the hell out of me, I wish there was a way to mod the amp so it doesn't do that and instead just switches off when the battery is low.

Yeah I have heard the O2 "pop" when the battery gets low, but I also hear that "pop" when I have my headphones plugged-in and I turn off the O2. Actually, when the O2 is on and my headphones are plugged-in, when I plug the ODAC into my computer's USB port, I get a "popping" sound or two from that as well. I'm not too concerned about it though as long as my K 701 doesn't experience some weird driver warping effect (from too much voltage?) like a certain other amp.

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post #66 of 296
1/5/13 at 3:12pm
Thread Starter 
Quote:
Originally Posted by miceblue View Post

Yeah I have heard the O2 "pop" when the battery gets low, but I also hear that "pop" when I have my headphones plugged-in and I turn off the O2. Actually, when the O2 is on and my headphones are plugged-in, when I plug the ODAC into my computer's USB port, I get a "popping" sound or two from that as well. I'm not too concerned about it though as long as my K 701 doesn't experience some weird driver warping effect (from too much voltage?) like a certain other amp.

Hum... I wonder which amp that could be, Schiit I can't remember the name wink.gif
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post #67 of 296
1/5/13 at 5:05pm

Hmmm, I never get popping sounds when plugging in the USD ODAC? But I dont even think of doing that often at all...I just tried it about 10 times and no popping sound here at all.

 

Alex

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post #68 of 296
1/6/13 at 12:43am
Thread Starter 
I wouldn't worry about the popping too much as the O2 has a built in headphone protection circuit.
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post #69 of 296
1/7/13 at 12:11am
Quote:
Originally Posted by randomkid View Post

I wouldn't worry about the popping too much as the O2 has a built in headphone protection circuit.

...hmmm, but it sounds like that's what's not working.

I haven't ever run down the batteries, but all the other stuff (turning off, etc) only causes the usual quiet thump...into my etymotics.

At a guess one of the mosfets is malfunctioning.
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post #70 of 296
1/7/13 at 12:53am
Thread Starter 
Best thing to do is ask John at JDS Labs
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post #71 of 296
1/7/13 at 6:20am

My O2 doesn't make any popping noises when turned on/off.  I would contact JDS Labs and ask them.

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post #72 of 296
1/7/13 at 8:18pm

I do get some stutter / static occasionally. But It could be Foobar, it could be my computer, I am not sure. Seems to happen when I engage in some serious multi-tasking / PDF downloading and viewing.

 

This occured through the normal HP jack as well as the O2 + ODAC combo.

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post #73 of 296
1/9/13 at 1:33am
Quote:
Originally Posted by MrMateoHead View Post

I do get some stutter / static occasionally. But It could be Foobar, it could be my computer, I am not sure. Seems to happen when I engage in some serious multi-tasking / PDF downloading and viewing.

 

This occured through the normal HP jack as well as the O2 + ODAC combo.


Stutter means a memory buffer underflow.

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post #74 of 296
1/9/13 at 8:39am

If your doing some serious multi-tasking well...thats the issue...

 

You either put up with it or get a bigger ie faster system etc....

 

I have a HTPC i do most of my listening on with the cans....and I do multi-task and every once in awhile i detect stuttering or a skip...

 

If I stop, it stops....for the most part i can listen and browse with no issues at all..

 

Its what it is....

 

Alex

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post #75 of 296
1/9/13 at 9:09am

Check your DPC latency using LatencyMon. It should be below 1000us, better yet below 500us. Even occasional latency spikes can cause glitches.

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