I am building a new house, and i am considering to have provision for possible projector. What wires should i consider installing? Just an hdmi cable coming down to a specific point behind sitting position for example? And then audio cable going to the front for speakers?
It depends on what type of inputs you want to be using with the projector. Most projectors have pretty much everything on them now. Even though I just use HDMI on mine, I still ran a backup cable, as well as a set of component cables just in case I ever need them.
For audio, I'm guessing you'd want to do surround sound, so you'd be looking at a minimum of 5 speaker cables (plus the subwoofer) back to where you're storing your receiver.