Why does music differ in quality between devices,do ipod classic/iphone/macbook and nano have different power output ratings

Why does my music sound so differant on seperate devices ?.
same song differs in quality between ipod classic , nano , macbook and ipad.
do the devices have power output ratings if so is one more powerful than the other ?.
same song , same headphones all downloaded from the same source

Doesn't anybody have any ideas why diagnostics say "no universal serial bus controller found" and yet founds connected device information just fine?
IPod and iPhone appears in itunes and device manager with no problem, but syncing stops with error everytime.
Do you think that this would be an issue with: ITunes, Windows 8 or Asus Maximus V Formula motherboard?
Am I right, that diagnostics should find universal serial bus controller even though there was nothing attach to it?
Am I alone with this problem?
I have also iPod 4gb and iPod 8gb, which shows in itunes, but I'm affraid to sync them if those stops same way.

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Hi Lisa,
I know from experience that this must be a frustrating situation for you especially if you don't want to loose the music/video content that is currently on your ipod. Unfortunately though you may have to consider re-syncing it as it thinks its currently synced with another computer.
If you bought any music that is on the ipod through itunes you can opt to right click the ipod in itunes and 'transfer purchases' if you authorise your library in the 'Store' menu in itunes. Some reasons for this happening may include some of the following:
Deleting and reinstalling your itunes on the computer.
Removing the account you had on the computer you used itunes in and making a new one. (User account, eg: Lisa).
Changing computers in the past.
A friend or family member syncing it on their computer to give you there music.
A sign of a failing iPod.
Alternatively you can opt to not sync it and keep the music that is on your ipod there but this means you will never be able to update your ipod.
Hope this helps!

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Hi Jimbob1985,
If you are having issues with your devices not being recognized in iTunes on your Windows machine, you may find the following article helpful:
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/ts1538
Regards,
- Brenden

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Interval Since Last Panic Report: 97797 sec
Panics Since Last Report:          1
Anonymous UUID:                    17D8F909-09A9-4BC6-A153-A12F75529506
Sun Jan 27 09:32:57 2013
panic(cpu 0 caller 0xffffff80002c4794): Kernel trap at 0xffffff80002b4b31, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x00000000800a9118, CR3: 0x0000000000100000, CR4: 0x0000000000000660
RAX: 0xffffff80008c2028, RBX: 0x00000000800a9100, RCX: 0xffffff800ae5bf00, RDX: 0x0000000000000080
RSP: 0xffffff8078713e68, RBP: 0xffffff8078713eb0, RSI: 0x000000005aefd876, RDI: 0x00000000800a9118
R8: 0x0000000000000010, R9: 0x0000000000000000, R10: 0xfffffe802662d000, R11: 0x00080000000263f3
R12: 0xffffff8078713f60, R13: 0xffffff8078713f78, R14: 0x0000000000000000, R15: 0x00000000800a9118
RFL: 0x0000000000010002, RIP: 0xffffff80002b4b31, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0x00000000800a9118, Error code: 0x0000000000000000, Faulting CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff8078713b10 : 0xffffff8000220792
0xffffff8078713b90 : 0xffffff80002c4794
0xffffff8078713d40 : 0xffffff80002da55d
0xffffff8078713d60 : 0xffffff80002b4b31
0xffffff8078713eb0 : 0xffffff80002352a5
0xffffff8078713ec0 : 0xffffff800036489d
0xffffff8078713ee0 : 0xffffff8000345031
0xffffff8078713fb0 : 0xffffff8000820057
BSD process name corresponding to current thread: kernel_task
Mac OS version:
11G63
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
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