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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. |
01-21-2008, 03:23 AM
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Administrator
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Join Date: Jun 2001
Location: Metro Detroit
Posts: 7,606
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Can one of my fellow U.S. (if that makes a difference, with respect to volume max settings) iPod Classic 160 Windows users e-mail me the files I need to downgrade it to 1.0.3? I'm looking for the following files: - iPod_24.1.0.3.ipsw.signature
- iPod_24.1.0.3.ipsw
You can find these files in the following directory:
C:\Documents and Settings\*YOUR PROFILE NAME*\Application Data\Apple Computer\iTunes\iPod Software Updates
(By default, it should be C:, but if you've installed iTunes to another drive, then use that drive letter in place of "C".)
I would very much appreciate it if you could e-mail me these files to ipod@head-fi.org.
Thanks in advance.
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01-21-2008, 03:24 AM
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Headphoneus Supremus
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Join Date: Nov 2004
Location: Ohio
Posts: 2,479
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If I buy a classic will I be required to update to the new firmware?
__________________
Home: Beresford TC-7520>>> Woo Audio WA22(ordered)>>> Sennhesier HD800 and AKG K1000
Portable: Ipod Classic>>>Ultimate Ears 11 pro
Headphones Sold: AKG k501, k340, k701 and k1000(twice), Denon D5000, Senn PX100, HD580, HD650, and HE60, Sony SA5000 and CD3000, Audio Technica L3000 and W5000, Grado 325i, RS1(twice), RS2 and Allesandro MS-2i, Headphile hp3000(Grado hp1000 drivers in a Sony CD3K shell) and k3000(AKG K1000 drivers in a Sony CD3K shell)
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01-21-2008, 04:03 AM
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Head-Fi'er
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Join Date: Dec 2007
Location: Littleton, CO
Posts: 31
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Quote:
Originally Posted by Clutz
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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I saw .5v on the line out (i.e. through the dock connector). The offset at the headphone jack is dependent on the volume setting when the device is put to sleep. If you run the volume all the way up before putting it to sleep, you should see close to .5v at the headphone out too
nine
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01-21-2008, 04:24 AM
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Head-Fi'er
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Join Date: Jan 2008
Posts: 87
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Unfortunately, I loaded v1.1 onto my Ipod Classic without reading through this message stream. I found the static problem which is mentioned. This is occurring because the software is not properly controlling the power management chip. As a result, with the CODEC running continuously, the battery will drain slowly as it pumps out the hiss. I went to the "c:\Documents and Settings\<username>\Application Data\Apple Computer\iTunes\iPod Software Updates" and removed the two new files which had been copied into that directory for v1.1, making sure the v1.0.3 files were still in the directory. I then "restored" the iPod back to v1.0.3 and am currently reloading the ~100Gb of data I have onto it. I don't expect to have any problem with this restore.
My advice--don't take this update since it isn't turning off the CODEC. As well, if it is putting out a signal with an 80-500 mV DC offset, this is going to damage a lot of sensitive headphones (there are no DC decoupling capacitors in the Ipod Classic output path). I got the CODEC noise under two conditions: (1) when I manually shut down the iPod with music playing and (2) when I just paused it and let it time out. I didn't get the output noise when I paused, then manually shut the iPod down. (I didn't mess with the volume to see if it only happened when set to above 80%.)
__________________
Current Earphones: Ultimate Ears TripleFi 10, Westone 3, Shure SE530, Westone UM3X, Shure e500c, Shure e4c, Ultimate Ears Super.Fi 5 Pro, Etymotic 4s, Ultimate Ears Metro.Fi 200v, Sennheiser PCX250, Klipcsh Custom 3, Sony EX51LP, Creative EP630, Bose QC2, Sennheiser HD520II, Sony MDR-V6, Philips HN060
Sources: Ipod 6G 160Gb (Classic), 5.5G 80Gb, 4G 60Gb, 3G 40Gb, 3G 30Gb, 2G 20Gb
Zune 120Gb
Archos 20Gb
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01-21-2008, 04:25 AM
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Junior Head-Fi'er
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Join Date: Jun 2006
Posts: 20
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just my 2 cents worth:
since the ipod classic and the nano 3G share similar firmware roadmaps, i looked out for the same issue on my nano 3G
there isn't any noise when the nano is off mode, but every time i switch it on, i hear a moderately loud pop (that's on sensitive creative ep630s)
haven't put a multimeter to it but if anyone requests me to do so i'd do it!
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01-21-2008, 04:39 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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Quote:
Originally Posted by jude
Can one of my fellow U.S. (if that makes a difference, with respect to volume max settings) iPod Classic 160 Windows users e-mail me the files I need to downgrade it to 1.0.3? I'm looking for the following files: - iPod_24.1.0.3.ipsw.signature
- iPod_24.1.0.3.ipsw
You can find these files in the following directory:
C:\Documents and Settings\*YOUR PROFILE NAME*\Application Data\Apple Computer\iTunes\iPod Software Updates
(By default, it should be C:, but if you've installed iTunes to another drive, then use that drive letter in place of "C".)
I would very much appreciate it if you could e-mail me these files to ipod@head-fi.org.
Thanks in advance. |
Be carefull jude. While the majority of people on the internet are good, there are some bad apples out there. One of those said bad apples could send you a corrupted firmware file, and you will end up with a brick. 
__________________
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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01-21-2008, 06:51 AM
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100+ Head-Fi'er
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Join Date: Jul 2007
Location: Helsinki, Finland
Posts: 332
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Quote:
Originally Posted by jude
Can one of my fellow U.S. (if that makes a difference, with respect to volume max settings) iPod Classic 160 Windows users e-mail me the files I need to downgrade it to 1.0.3? I'm looking for the following files: - iPod_24.1.0.3.ipsw.signature
- iPod_24.1.0.3.ipsw
You can find these files in the following directory:
C:\Documents and Settings\*YOUR PROFILE NAME*\Application Data\Apple Computer\iTunes\iPod Software Updates
(By default, it should be C:, but if you've installed iTunes to another drive, then use that drive letter in place of "C".)
I would very much appreciate it if you could e-mail me these files to ipod@head-fi.org.
Thanks in advance. |
I sent you email.
__________________
Source: Squeezebox Duet / Auzen X-FI Prelude (OPA627) / iPod Classic 160G
Amp: Woo Audio WA6 (maxed / pdps)
Headphone: Denon AH-C700 / Sennheiser HD 800 / Sennheiser HD 650 (APS mod) + APureSound V3 / Denon AH-D2000 (markl mod) + APureSound V3
In progress: Buffalo32S DAC & balanced β22
Feedback / Pics
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01-21-2008, 07:28 AM
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500+ Head-Fi'er
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Join Date: Jan 2008
Location: Redmond, WA
Posts: 825
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Quote:
Originally Posted by me7
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.
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There is a dangerous way to check it. Turn off your amp, plug in the headphones, then turn on the amp. DC will bias the voice coil, causing the driver to shift one direction or another. Basically you will hear a pop if there is a DC bias... unfortunately that could be the last thing you hear out of your headphones. Get a multimeter 
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01-21-2008, 09:00 AM
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500+ Head-Fi'er
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Join Date: Aug 2007
Location: London
Posts: 910
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Quote:
Originally Posted by number1sixerfan
If I buy a classic will I be required to update to the new firmware?
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No. If the Classic doesn't already have the v1.1 firmware on it just go to preferences and uncheck the auto-update box.
This seems to be the only place that's discussing the problem. I would have thought more people would be finding the issue and wanting to fix it.
__________________
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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01-21-2008, 09:12 AM
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Headphoneus Supremus
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Join Date: Apr 2006
Location: Los Angeles, CA
Posts: 4,836
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Quote:
Originally Posted by Manny Calavera
I am starting to wonder if Apple out sourced all Ipod QA to India recently....  |
"Dell's doing it, so why shouldn't we?" --- That's probably what the Apple execs are saying to eachother.
I don't use my iPod anymore but I won't do the upgrade for awhile until they fix this.
Can someone explain what DC offset means and why it can cause damage to your headphones? I'm curious.
__________________
Team Musical Truth Headphones ☊ → Sennheiser HD800 (modified) + APureSound V3 XLR w/ Rhodium Furutech + Q resistance adapters (on occasion)
DAC → Audio-gd Reference One DAC ::: Transport/Source → Logitech Transporter (w/ iPod Touch controller) :::
Amp → Audio-gd Phoenix ::: Coming soon: Balanced ß22 + σ22 (custom dual chassis)
Power → PS Audio Power Plant Premier ::: Virtual Dynamics Master LE 2.0 + Power 3 ::: Locus Design Group Axis ::: Audio-gd Exclusive (x2)
::::::::::::::: PS Audio Noise Harvester ::: Cobalt Cable Ultimate Power
Interconnects → Blue Jeans Cables BNC ::: Audio-gd Sharkwire silver CAST & XLR ::: Locus Design Group custom CAST & DC power cables
FOR SALE:
Audio-gd Phoenix balanced headphone amplifier/preamp $975 + shipping
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01-21-2008, 09:22 AM
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Administrator
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Join Date: Jun 2001
Location: Metro Detroit
Posts: 7,606
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Quote:
Originally Posted by jantze
I sent you email.
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Thank you very much, jantze. That was very kind of you.
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01-21-2008, 11:33 AM
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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 jude
Can one of my fellow U.S. (if that makes a difference, with respect to volume max settings)...
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There has been a lot of discussion whether the EU installer is different from the US version. To solve this mystery, I generated MD5 hashes for the EU 1.03 installer. If someone from the US could check his files, we would know for sure.
iPod_24.1.0.3.ipsw:
Quote:
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A0FC2AFA9D6D541666F3407E589E0146
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iPod_24.1.0.3.ipsw.signature
Quote:
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F3D3263689F05DEB5C8E018AEA93D2E2
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__________________
iPod touch 3G 64GB
Shure SE310
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01-21-2008, 12:36 PM
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1000+ Head-Fi'er
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Join Date: Jul 2004
Location: Hong Kong
Posts: 1,045
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Does this have anything to do with iTunes 7.6?? Mine is asking me to allow it to update.
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01-21-2008, 12:47 PM
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100+ Head-Fi'er
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Join Date: Apr 2007
Location: good old germany
Posts: 227
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Quote:
Originally Posted by Jubei
Does this have anything to do with iTunes 7.6?? Mine is asking me to allow it to update.
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As far as I know no! But you better not install firmware 1.1
__________________
16 GB iPod Touch 2G @ Lame V0 > Triple.Fi 10 Pro
Macbook Pro > Corda Move DAC > DT 880
Feedback: head-fi
Photography: www.keynan.de
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01-21-2008, 01:05 PM
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Head-Fi'er
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Join Date: Sep 2006
Location: MI
Posts: 91
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Quote:
Originally Posted by IpodHappy
I got the CODEC noise under two conditions: (1) when I manually shut down the iPod with music playing and (2) when I just paused it and let it time out. I didn't get the output noise when I paused, then manually shut the iPod down.
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I was wondering why I haven't noticed this problem.
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