Apple iMac (17-inch Mid 2006) - Manual (Page 65)

iMac (17-inch Mid 2006/Late 2006 CD) Take Apart — Speaker 
Removing the Speakers
Using a T10 torx screwdriver, remove the screws from the left and right speakers.
Replacement Note: The longer of the two speaker mounting screws is used to secure the
left speaker; the shorter screw secures the right speaker.
Lift the speakers straight up and disconnect the speaker cable under the right speaker.
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