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how exactly would the audio components such as speakers and subwoofer connect?
this hooks up through your soundcard and then onto your amp(s); most commonly, or you can go with a dac like i did. then from your amps you go to the speakers
What accessories are required other than computer
dc-dc power supply with shutdown controller and touchscreen lcd are the only things you do need. there are other things you may want like bluetooth dongle, gps reciever, wifi card, usb hub, external dvd rom drive (and enclosure), etc...
am I able to adapt webcamera's do work with what Im planning?