"Once I pulled the PCB out of the 5.25" bay and had a look at the traces, I made a quick discovery. The speaker jack was identical to the one I used in my headphone jack mod, and it already had traces etched into the PCB that went back to the connector."
FULL STORY @ VOIDYOURWARRANTY (http://www.voidyourwarranty.net/review/review.php3?r1=portmods/index.php3)