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| Portable Source Gear Discussion of portable audio source gear, like iPods, other digital audio players (DAPs), MD players, portable CD players. |
01-20-2008, 06:37 PM
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1000+ Head-Fi'er
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Join Date: May 2005
Location: UK
Posts: 1,465
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Quote:
Originally Posted by serpico
I would just exchange it for another just to make sure it's not the device. If you get the same problem with the new one, then it's probably a defect in the series. Maybe a flash model is better or just another brand.
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Its definitely the 1.1 update causing this problem. I haven't experienced such problems prior to the latest update.
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01-20-2008, 07:45 PM
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Headphoneus Supremus:
Tells us when we're offset.
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Join Date: Jun 2002
Location: Saint Paul, Minnesota
Posts: 2,399
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I just measured the DC offset on my 80GB iPod Classic. I only found DC offset on one of the two channels, and while it was alarmingly high (ranged between about 30mV-80mV), I didn't measure it as high as 0.5V.
Cheers,
Brad
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01-20-2008, 08:02 PM
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Headphoneus Supremus:
Tells us when we're offset.
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Join Date: Jun 2002
Location: Saint Paul, Minnesota
Posts: 2,399
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I've also noticed that there is significant DC offset even while music is playing. I don't think I will be using any of my good headphones with this iPod until they fix this issue with the DC offset!
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01-20-2008, 08:13 PM
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Head-Fi'er
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Join Date: Sep 2007
Posts: 62
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Quote:
Originally Posted by Clutz
I've also noticed that there is significant DC offset even while music is playing. I don't think I will be using any of my good headphones with this iPod until they fix this issue with the DC offset!
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How dangerous is this for headphones 
__________________
iPod touch 3G 64GB
Shure SE310
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01-20-2008, 08:16 PM
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500+ Head-Fi'er
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Join Date: Aug 2007
Location: London
Posts: 910
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Im really glad i haven't upgraded the firmware. Ill stay put till they sort it out!
Interestingly there isnt any talk of this over at Mac Rumors. I did mention it in a thread, but nothing.
Is anyone having issues with the LOD? Apparently that might be yet an another issue of the 1.1 upgrade. (I mean worse than the pausing/skipping discussed in the other thread)
__________________
Portable:iPod Classic 160Gb > UE Triple/Fi 10 Pro > ATH-ESW9
Home:Pro-Ject Xpression Mk3 > Naim CD5i > Naim NAC122x > Naim NAP150x > Mission M71i > DIY Floor Standers | Shanling PH100 > DT990
Other Stuff:MacBookPro | Nikon D40x > 18-200VR | LG Viewty
FEEDBACK
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01-20-2008, 08:17 PM
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Headphoneus Supremus:
Tells us when we're offset.
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Join Date: Jun 2002
Location: Saint Paul, Minnesota
Posts: 2,399
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Quote:
Originally Posted by me7
How dangerous is this for headphones |
It's quite dangerous. It could cause permanent damage. When building a headphone amp, you generally wouldn't connect your headphones to the headphone amp unless it had less than 10mV of DC offset - and I usually wait until I have less than 1mV if I'm able to get there. 80mV is a lot. 500mV (0.5V) is really a lot.
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01-20-2008, 08:28 PM
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Head-Fi'er
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Join Date: Sep 2007
Posts: 62
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Can i measure this myself with my cheap on-board audio in?
EDIT: Is there a way to downgrade a iPod? iTunes does not offer an option for that.
__________________
iPod touch 3G 64GB
Shure SE310
Last edited by me7; 01-20-2008 at 08:31 PM.
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01-20-2008, 08:31 PM
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Headphoneus Supremus:
Tells us when we're offset.
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Join Date: Jun 2002
Location: Saint Paul, Minnesota
Posts: 2,399
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No, I don't think so. You would either need to have a voltmeter or a scope. Volt meters are pretty cheap though - you can get one at Radioshack for about $10. It wouldn't be a great one, but it would let you measure the voltage output.
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01-20-2008, 09:21 PM
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Head-Fi'er
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Join Date: Sep 2007
Posts: 62
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I found an easy way to downgrade my iPod classic. First "Open iTunes and in Preferences uncheck automatic check for updates".
If you are a mac user, read here. Windows users need a different folder. Open "Documents and Settings", search the folder that represents your username and open the hidden folder "Application Data\Apple Computer\iTunes". Now proceed like the link tells.
Maybe someone with a voltmeter can check if the issue is really not present in the older firmware (maybe it was just undetected?).
__________________
iPod touch 3G 64GB
Shure SE310
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01-20-2008, 09:38 PM
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Headphoneus Supremus:
Tells us when we're offset.
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Join Date: Jun 2002
Location: Saint Paul, Minnesota
Posts: 2,399
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I think I will wait for a few days to see if Apple responds to this bug before I take that route. It took me nearly 3 days to transcode & copy all my ALAC files to 256 VBR AACs
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01-20-2008, 09:46 PM
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Head-Fi'er
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Join Date: Sep 2007
Posts: 62
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You know that you won't loose your library? Your iPod will be resynced immediately with iTunes.
__________________
iPod touch 3G 64GB
Shure SE310
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01-20-2008, 10:33 PM
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500+ Head-Fi'er
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Join Date: Apr 2007
Location: Canada
Posts: 767
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Quote:
Originally Posted by zumaro
Ahh the explanation for what so many of us are experiencing - hiss and static noises after the iPod is turned off. Well done Apple - your quality control department must have been fired by now with crap update after crap update slipping through?
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I am starting to wonder if Apple out sourced all Ipod QA to India recently.... 
__________________
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Home:Arcam Solo+McIntosh LS340+Pro-Ject RPM 9.1+JA Michell TecnoDec w/upgraded RB250+Dynavector 10x5+Graham Slee Gram Amp 2 SE
Cans:AKG.K601+Beyerdynamic.DT250-80+Senn.HD497+Senn.HD477+Senns.HD650+ATH-ESW9+Shure SE210-K+Jays Q-Jays
Portable Sources:Ipod 40Gb 3G+Black Ipod 80Gb Classic x2 with Belkin Re-Mix Black x2 +3G 8gb Green Nano
Ordered : "Financial Self Restraint 1.0" from my wife !!
Not so new stuff : RSA Predator X2
Lusting After: Rare vinyl Hip Hop records
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01-21-2008, 02:34 AM
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Headphoneus Supremus
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Join Date: Jan 2007
Location: Parts Unknown, Canada
Posts: 2,234
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Well at least I know now that my ipod isnt messed, when I first heard the afformentioned noise I was getting ready to return the damn thing.
__________________
Portable rig: 160 gb iPod Classic -> ALO Jumbo Cryo -> RSA Predator -> UE11 Pro/Sennheiser HD650
Portable rig II: Apple iPhone 3g -> M-Audio IE-40 (UE Triple .fi 10 Pro)
Team "Team Hater"
My Head-fi feedback
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01-21-2008, 02:42 AM
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100+ Head-Fi'er
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Join Date: Nov 2007
Location: Vancouver
Posts: 252
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Knowing Apple they won't update the Classic any more, and then 6 months from now charge users $20. Crazy fruit company. 
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01-21-2008, 03:23 AM
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100+ Head-Fi'er
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Join Date: Mar 2007
Location: Hawaii
Posts: 386
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Wow. Will Apple be replacing all the Shure and UE IEMs that are damaged by this mishap?
__________________
Current: Zune 30 + Maximo 490S.
Maximo 490S> JVC>FX77>FX55>FX33>
“Let us so live that when we come to die even the undertaker will be sorry.” - Mark Twain
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