Two of Three internal speakers arn't being used in Black Macbook (2006)?

Hi,
I probably tinker with my Macbook too much, however I noticed today that sound is only coming through the one internal "woofer" speaker, or the speaker that faces up at the F8 key. When using the internal speakers, not using an external output in other words, the two stereo speakers that face back toward the lcd screen on the left and the right sides of the case do not emit sound at all. I've checked the connections of each, I've played with settings in the System Preferences, and I've tried several different settings in iTunes. I cannot get the Macbook to use those speakers.
Is there some software glitch in the Kernal or Firmware that is preventing these from being used? Or could it be a hardware or sound card issue? I have no idea. It isn't something critical or anything, the single speaker in the middle works fine, however, I imagine the Macbook's internal audio quality and volume would be much improved if it were using all of the speakers installed.
Any ideas or thoughts?
About my Macbook:
Black Macbook (2006)
2 GHz Intel Core 2 Duo
2 GB of RAM
500GB SATA Hard Drive
OSX 10.6.8 w/ Windows 7 H.P. Bootcamp Partition
Any help would be much appreciated.

Try resetting the SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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EtreCheck version: 2.0.11 (98)
Report generated November 4, 2014 at 7:59:28 AM EST
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MacBook Pro (15-inch, Early 2011) (Verified)
MacBook Pro - model: MacBookPro8,2
1 2.2 GHz Intel Core i7 CPU: 4-core
16 GB RAM Upgradeable
BANK 0/DIMM0
8 GB DDR3 1600 MHz ok
BANK 1/DIMM0
8 GB DDR3 1600 MHz ok
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Color LCD 1440 x 900
AMD Radeon HD 6750M - VRAM: 1024 MB
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OS X 10.9.5 (13F34) - Uptime: 0:3:43
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TOSHIBA MK7559GSXF disk0 : (750.16 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
HDV4 (disk0s2) / [Startup]: 749.30 GB (712.10 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
MATSHITADVD-R   UJ-898
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Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
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/Library/Application Support/Avast/components/fileshield/unsigned
[loaded] com.avast.AvastFileShield (2.1.0 - SDK 10.9) Support
/Library/Application Support/Avast/components/proxy/unsigned
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[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.avast.userinit.plist Support
Launch Daemons: ℹ️
[invalid?] com.adobe.SwitchBoard.plist Support
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JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
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TroviNPAPIPlugin: Version: 1.0 - SDK 10.9 Support
Google Earth Web Plug-in: Version: Unknown
Safari Extensions: ℹ️
Avast Online Security
Trovi Search for Safari
3rd Party Preference Panes: ℹ️
None
Time Machine: ℹ️
Time Machine not configured!
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      16% mds
      7% WindowServer
      1% loginwindow
      1% fontd
      1% com.avast.daemon
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120 MB com.avast.daemon
86 MB Google Chrome
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52 MB WindowServer
41 MB Google Chrome Helper
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1.34 GB Active RAM
944 MB Inactive RAM
1.43 GB Wired RAM
1.11 GB Page-ins
0 B Page-outs

Two of Three internal speakers arn't being used in Black Macbook (2006)?

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