New Posts  All Forums:Forum Nav:

Clip+ DC offset - Page 2

post #16 of 27
12/17/10 at 12:19am
Quote:
Originally Posted by porthillsbomber View Post


I put up a flyspray http://www.rockbox.org/tracker/task/11812 and saratoga has taken notice. He mentioned fade to pause which in theory would zero it on pause but I checked and I had it on.  I tested it and it doesn't make a difference either way so I'm not really sure what the cause is now. But I did find I get a squeak at pause and unpause with fade on but not with it off, the squeak is what led me to measure the DC offset in the first place

 

saratoga is a sharp guy. Good luck. Perhaps sunday or monday i can try this out with some other AMS based devices.

 

 

wrt the other - I know that caps don't block transients, but the way the behavior was described made it sound like constant DC.
 

Reply
post #17 of 27
12/20/10 at 2:05pm
Thread Starter 

That would be good as another guy on the rockbox forum has said he gets the little squeak which I think is an associated problem on his Fuze.



 

Quote:
Originally Posted by ericj View Post


Good luck. Perhaps sunday or monday i can try this out with some other AMS based devices.

 

 

 



 

Reply
post #18 of 27
1/1/11 at 5:49pm

I am currently experiencing that horrible sinking feeling..

 

I'm using a Clip+ and a new pair of Sennheiser IE-8's (16-Ohm), I run rockbox with fade to pause enabled and often hear the pause/unpause squeak.

 

Is it possible that I have already damaged these IEM's? How much might I have damaged them?

Reply
post #19 of 27
1/1/11 at 6:10pm
Thread Starter 


I think it is unlikely that you will of damaged them as the DC isn't during the music (well I'm still using my clip+ anyway) but the problem hasn't been solved as far as I know.
 

Quote:
Originally Posted by Ogham View Post

I am currently experiencing that horrible sinking feeling..

 

I'm using a Clip+ and a new pair of Sennheiser IE-8's (16-Ohm), I run rockbox with fade to pause enabled and often hear the pause/unpause squeak.

 

Is it possible that I have already damaged these IEM's? How much might I have damaged them?

Reply
post #20 of 27
1/1/11 at 6:33pm

Thanks for that, it is a welcome relief! I'm glad you seem happy to continue using rockbox on your clip+!

 

I know very little about this sort of thing - which makes me very tempted to switch back to OF for peace of mind.  Do you think that is an overreaction?

 

Quote:
Originally Posted by porthillsbomber View Post


I think it is unlikely that you will of damaged them as the DC isn't during the music (well I'm still using my clip+ anyway) but the problem hasn't been solved as far as I know.


Edited by Ogham - 1/1/11 at 6:37pm
Reply
post #21 of 27
1/1/11 at 7:26pm

porthillsbomber,

 

Is the following statement on the Flyspray bug report still valid?

 

Quote:
This has a real potential to damage headphones if you have the volume up and were unlucky enough to pause on a peak.
Reply
post #22 of 27
1/1/11 at 7:56pm
Thread Starter 

Na I thought about it some more and I don't think so unless the DC impeadance of your phones is very low and the coil over heated as a consequence.

 

Edit: Well, that was the question I was asking when I started this thread so I'm not entirely sure but I'm pretty sure the answer is no.


Edited by porthillsbomber - 1/1/11 at 8:10pm
Reply
post #23 of 27
1/2/11 at 4:34am

Would 16 Ohm Sennheiser IE-8's be considered 'very low' in this particular situation?

 

Thanks again for shining some light on this for me, I've been worrying about it all night!

 

Quote:
Originally Posted by porthillsbomber View Post

Na I thought about it some more and I don't think so unless the DC impeadance of your phones is very low and the coil over heated as a consequence.

 

Edit: Well, that was the question I was asking when I started this thread so I'm not entirely sure but I'm pretty sure the answer is no.

Reply
post #24 of 27
1/2/11 at 1:30pm
Thread Starter 

Na I guess I mean very low compared to it's nominal impedance as that is what will set the volume you have your clip+ set at. I mean if it can handle that sort of fluctuating voltage while listening to music it should be able to handle it as DC. The only occasion I can see that you would get in to trouble is if you had been listening to high impedance/ low efficiency cans through with an amp and then you paused and plugged you IE8s back in to the amp. Until you turned down the volume you could have something like 5+VDC in this case which I would guess a pair of IE8s wouldn't like.


Edited by porthillsbomber - 1/2/11 at 3:09pm
Reply
post #25 of 27
1/2/11 at 4:03pm

Cheers porthillsbomber, that gives me a lot more confidence to continue using rockbox! (My IE-8's have been in 'stasis' since finding this thread).

 

So basically, you don't see any risk of coil overheat or mechanical diaphragm/membrane damage due to the 200+ mV DC with 16 Ohm impedance?

No more questions I promise! I appreciate you taking the time to answer me very much! smily_headphones1.gif

 

Quote:
Originally Posted by porthillsbomber View Post

Na I guess I mean very low compared to it's nominal impedance as that is what will set the volume you have your clip+ set at. I mean if it can handle that sort of fluctuating voltage while listening to music it should be able to handle it as DC. The only occasion I can see that you would get in to trouble is if you had been listening to high impedance/ low efficiency cans through with an amp and then you paused and plugged you IE8s back in to the amp. Until you turned down the volume you could have something like 5+VDC in this case which I would guess a pair of IE8s wouldn't like.

Reply
post #26 of 27
1/2/11 at 4:36pm
Thread Starter 

No, I don't think so. You would never get that much anyway because I measured that with the volume at max.

Reply
post #27 of 27
1/2/11 at 4:56pm

Many thanks porthillsbomber biggrin.gif
 

Quote:
Originally Posted by porthillsbomber View Post

No, I don't think so. You would never get that much anyway because I measured that with the volume at max.

Reply
New Posts  All Forums:Forum Nav:
  Return Home