Mystery audio performance changes and distortion

I listen to a lot of rock, hard rock, and heavy metal on my 80GB Video iPod. In the past two months, I’ve been having problems with distortion and equalization. I do have the latest iTunes and iPod software updates installed and I have re-instaled iTunes and re-initialized the iPod.
Originally, I was using the iPod earbuds and upgraded to vModa Vibes. Most of my music sounded great with an EQ setting of “Dance” with the vModas.
After a while, I started to experience distortion and loss of detail, especially on the left side (crackling). I thought I had damaged the vModa Vibes, so I purchased a pair of Ultimate Ears Super.fi 5 Pro Earphones.
The Ultimate Ears Super.fi 5 Pro earphones sounded terrible with no highs or midrange detail and way too much low range. They seemed to distort easily and overload in the-mid range if there was a lot guitars playing (drowning the details out). I tried all sorts of EQ settings to no avail. The problems remained, even on treble boost, but I didn't have a problem specific to the left side.
I returned the Ultimate Ears Super.fi 5 Pro earphones and switched back to the vModa Vibes for a while and finally decided, on the recommendation of a friend, to try the Bose TriPort IE earphones.
The Bose TriPort IE earphones were much better than the Ultimate Ears Super.fi 5 Pro earphones, but still lacked high frequency and mid-range detail as compared to the vModa Vibes.
While switching back and forth between the vModas and the Bose earphones, the sound performance (or equalization) seemed to change at random, even though I kept the EQ set to off.
At one point, the vModas suddenly had incredible bass, while maintaining the other performance characteristics, with the EQ still set to off. Later, I played the same song again, and the bass was normal (all I did was charge the battery with the Apple USB AC adapter).
I’ve been using the vModas again for about a week now, and every time I listen to the same song, it plays differently, sometimes great, sometimes with extra bass, sometimes muddled and distorted. The same thing happens with Bose TriPort IEs, except they aren’t as clear as the vModas.
The performance issues seem to somewhat track battery charging (i.e. – after I charge the iPod up, audio performance changes and it sometimes improves as the battery drains).
I figure that either there is a hardware problem with the iPod or there is some type of EQ virus going around.
Anyone having similar problems or have a solution??

I went out and bought a 2 GB iPod Nano and loaded some songs onto it.
Everything sounds great with the vModa Vibe earphones so I guess my 80 GB video iPod might have a few twisted transistors.
I'll have to try to clear out the 80 GB video iPod and reinitialize/restore it again to see if it corrects the problem.

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            Apple Inc. Bluetooth USB Host Controller
        Maxtor OneTouch 160.04 GB
            OneTouch4 Mini (disk1s1) /Volumes/OneTouch4 Mini : 160.04 GB (116.48 GB free)
        Seagate USB Mass Storage 100.03 GB
            Seagate 100 (disk2s1) /Volumes/Seagate 100 : 100.03 GB (91.52 GB free)
    Thunderbolt Information: ℹ️
        Apple Inc. thunderbolt_bus
    Gatekeeper: ℹ️
        Mac App Store and identified developers
    Kernel Extensions: ℹ️
            /System/Library/Extensions
        [not loaded]    com.bose.bluetooth (1.0.0) [Click for support]
        [not loaded]    com.marvell.kext.USBGenericPrinterClass (1.0.0) [Click for support]
    Launch Agents: ℹ️
        [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
        [loaded]    org.gpgtools.gpgmail.enable-bundles.plist [Click for support]
        [loaded]    org.gpgtools.gpgmail.patch-uuid-user.plist [Click for support]
        [loaded]    org.gpgtools.Libmacgpg.xpc.plist [Click for support]
        [loaded]    org.gpgtools.macgpg2.fix.plist [Click for support]
        [running]    org.gpgtools.macgpg2.shutdown-gpg-agent.plist [Click for support]
        [loaded]    org.gpgtools.macgpg2.updater.plist [Click for support]
    Launch Daemons: ℹ️
        [loaded]    com.adobe.fpsaud.plist [Click for support]
        [running]    com.fitbit.galileod.plist [Click for support]
        [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
        [loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
        [loaded]    com.rogueamoeba.instanton-agent.plist [Click for support]
        [loaded]    com.sonos.smbbump.plist [Click for support]
        [loaded]    org.gpgtools.gpgmail.patch-uuid.plist [Click for support]
    User Launch Agents: ℹ️
        [loaded]    com.adobe.ARM.[...].plist [Click for support]
        [running]    com.hp.printerAgent.plist [Click for support]
    User Login Items: ℹ️
        iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
        Dropbox    Application  (/Applications/Dropbox.app)
        Safari    Application  (/Applications/Safari.app)
        Mail    Application  (/Applications/Mail.app)
        AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
        Fitbit Connect Menubar Helper    Application  (/Applications/Fitbit Connect.app/Contents/MacOS/Fitbit Connect Menubar Helper.app)
        Airfoil Speakers    Application Hidden (/Applications/Airfoil Speakers.app)
        Printer Pro Desktop    Application  (/Applications/Printer Pro Desktop.app)
    Internet Plug-ins: ℹ️
        FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]
        QuickTime Plugin: Version: 7.7.3
        AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
        AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
        Flash Player: Version: 17.0.0.169 - SDK 10.6 [Click for support]
        Default Browser: Version: 600 - SDK 10.10
        Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
        JavaAppletPlugin: Version: Java 8 Update 31 Check version
    User internet Plug-ins: ℹ️
        Stamps.com: Version: 1.1.13 [Click for support]
    Safari Extensions: ℹ️
        1-ClickWeather
        Adblock Plus
        SafariRestore
    3rd Party Preference Panes: ℹ️
        Flash Player  [Click for support]
        GPGPreferences  [Click for support]
        Java  [Click for support]
    Time Machine: ℹ️
        Skip System Files: NO
        Mobile backups: ON
        Auto backup: YES
        Volumes being backed up:
            Macintosh HD: Disk size: 150.14 GB Disk used: 46.65 GB
        Destinations:
            Data [Network]
            Total size: 497.62 GB
            Total number of backups: 55
            Oldest backup: 2014-03-29 22:27:52 +0000
            Last backup: 2015-04-17 03:29:42 +0000
            Size of backup disk: Excellent
                Backup size 497.62 GB > (Disk size 150.14 GB X 3)
    Top Processes by CPU: ℹ️
             4%    WindowServer
             1%    fontd
             0%    Fitbit Connect Menubar Helper
             0%    Dropbox
             0%    AppleSpell
    Top Processes by Memory: ℹ️
        361 MB    Safari
        100 MB    com.apple.WebKit.WebContent
        86 MB    mds_stores
        86 MB    Mail
        86 MB    WindowServer
    Virtual Memory Information: ℹ️
        10.03 GB    Free RAM
        5.01 GB    Active RAM
        571 MB    Inactive RAM
        1.57 GB    Wired RAM
        1.63 GB    Page-ins
        0 B    Page-outs
    Diagnostics Information: ℹ️
        Apr 16, 2015, 09:53:12 PM    Self test - passed
        Apr 16, 2015, 11:11:30 AM    /Library/Logs/DiagnosticReports/CalendarAgent_2015-04-16-111130_[redacted].cras h
        Apr 15, 2015, 12:23:01 PM    /Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2015-04-15-122301_[ redacted].cpu_resource.diag [Click for details]
        Apr 14, 2015, 06:55:26 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Mail_2015-04-14-185526_[redact ed].crash
        Apr 14, 2015, 02:47:54 AM    /Library/Logs/DiagnosticReports/CalendarAgent_2015-04-14-024754_[redacted].cras h

    Will try.  There are no cables/exterior connections involved here.
    Oddly enough, this worked.  I was unable to hear anything in Safe Mode, so just exited and rebooted (yes, I'd already tried rebooting, with no effect).  Gave iTunes a shot, and am now back to normal.
    Whatever works!
    Thank you.
    bkb

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