Low output audio level MBP Retina, 15-inch, Late 2013

All of a sudden I am getting very low level audio output from my speakers even when audio level is high, any suggestions please?

1.   System Preferences > Sound > Output > Internal Speakers/Headphone
       Settings for the selected device:
       Balance:
       Make sure that the slider is set at middle.
2.    AudioMIDI Setup
       Applications/Utilities/ Audio MIDI Setup.app
       Audio Devices window
       Side Bar
       Click the Built-in Output.
      Make sure that CH1 and CH2 volume sliders are matched.
3.  Reset SMC and PRAM.
     Reset PRAM.  http://support.apple.com/kb/PH4405
     Reset SMC.     http://support.apple.com/kb/HT3964
     Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".

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    0xffffff8117263a70 : 0xffffff7f8d1bc5ed
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    0xffffff8117263b60 : 0xffffff800b701249
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    Kernel UUID: DCF5C2D5-16AE-37F5-B2BE-ED127048DFF5
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    last unloaded kext at 20653188100496: com.apple.driver.AppleUSBCDC 4.2.2b5 (addr 0xffffff7f8d7c2000, size 16384)
    loaded kexts:
    com.symantec.kext.fw 5.3.1f4
    com.symantec.kext.ips 3.9.2f1
    com.symantec.kext.pf 5.7.1f4
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    com.apple.nke.asp-tcp 8.0.0
    com.apple.driver.AudioAUUC 1.70
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    com.apple.driver.AGPM 100.15.5
    com.apple.driver.ApplePlatformEnabler 2.1.7d1
    com.apple.filesystems.autofs 3.0
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    com.apple.driver.AppleUSBTCButtons 240.2
    com.apple.driver.AppleUSBTCKeyboard 240.2
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    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
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    com.apple.driver.AppleUSBXHCI 710.4.11
    com.apple.driver.AppleSmartBatteryManager 161.0.0
    com.apple.driver.AppleACPIButtons 3.1
    com.apple.driver.AppleHPET 1.8
    com.apple.driver.AppleRTC 2.0
    com.apple.driver.AppleSMBIOS 2.1
    com.apple.driver.AppleACPIEC 3.1
    com.apple.driver.AppleAPIC 1.7
    com.apple.nke.applicationfirewall 161
    com.apple.security.quarantine 3
    com.apple.security.TMSafetyNet 8
    com.apple.security.SecureRemotePassword 1.0
    com.apple.kext.triggers 1.0
    com.apple.driver.DspFuncLib 269.25
    com.apple.kext.OSvKernDSPLib 1.15
    com.apple.iokit.IOUSBUserClient 705.4.0
    com.apple.iokit.IOSerialFamily 11
    com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.2f6
    com.apple.iokit.IOBluetoothFamily 4.3.2f6
    com.apple.driver.AppleHDAController 269.25
    com.apple.iokit.IOHDAFamily 269.25
    com.apple.iokit.IOAudioFamily 203.3
    com.apple.vecLib.kext 1.2.0
    com.apple.iokit.IOSurface 97
    com.apple.AppleGraphicsDeviceControl 3.8.6
    com.apple.iokit.IOAcceleratorFamily2 156.6
    com.apple.driver.X86PlatformPlugin 1.0.0
    com.apple.driver.AppleSMC 3.1.9
    com.apple.driver.IOPlatformPluginFamily 5.8.1d38
    com.apple.driver.AppleBacklightExpert 1.1.0
    com.apple.iokit.IONDRVSupport 2.4.1
    com.apple.driver.AppleSMBusController 1.0.13d1
    com.apple.iokit.IOGraphicsFamily 2.4.1
    com.apple.driver.AppleUSBMultitouch 245.2
    com.apple.iokit.IOUSBHIDDriver 705.4.0
    com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.3
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    com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2
    com.apple.iokit.IOAHCIFamily 2.7.5
    com.apple.driver.AppleThunderboltNHI 3.1.7
    com.apple.iokit.IOThunderboltFamily 4.2.1
    com.apple.iokit.IO80211Family 710.55
    com.apple.driver.mDNSOffloadUserClient 1.0.1b8
    com.apple.iokit.IONetworkingFamily 3.2
    com.apple.iokit.IOUSBFamily 710.4.14
    com.apple.driver.AppleEFINVRAM 2.0
    com.apple.driver.AppleEFIRuntime 2.0
    com.apple.iokit.IOHIDFamily 2.0.0
    com.apple.iokit.IOSMBusFamily 1.1
    com.apple.security.sandbox 300.0
    com.apple.kext.AppleMatch 1.0.0d1
    com.apple.driver.AppleKeyStore 2
    com.apple.driver.AppleMobileFileIntegrity 1.0.5
    com.apple.driver.AppleCredentialManager 1.0
    com.apple.driver.DiskImages 396
    com.apple.iokit.IOStorageFamily 2.0
    com.apple.iokit.IOReportFamily 31
    com.apple.driver.AppleFDEKeyStore 28.30
    com.apple.driver.AppleACPIPlatform 3.1
    com.apple.iokit.IOPCIFamily 2.9
    com.apple.iokit.IOACPIFamily 1.4
    com.apple.kec.corecrypto 1.0
    com.apple.kec.Libm 1
    com.apple.kec.pthread 1
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    Bluetooth: Version 4.3.2f6 15235, 3 services, 27 devices, 1 incoming serial ports
    Thunderbolt Bus: MacBook Pro, Apple Inc., 17.2
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343531533641465238412D50422020
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343531533641465238412D50422020
    USB Device: Internal Memory Card Reader
    USB Device: Apple Internal Keyboard / Trackpad
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    Serial ATA Device: APPLE SSD SD0256F, 251 GB
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    Network Service: AirPort, AirPort, en0
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    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343531533641465238412D50422020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x112), Broadcom BCM43xx 1.0 (7.15.159.13.12)
    Bluetooth: Version 4.3.2f6 15235, 3 services, 27 devices, 1 incoming serial ports
    Network Service: AirPort, AirPort, en0
    Serial ATA Device: APPLE SSD SD0256F, 251 GB
    USB Device: Internal Memory Card Reader
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
    Thunderbolt Bus: MacBook Pro, Apple Inc., 17.2

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