[MatrixDweller]

I used the grey carlon hard PVC stuff. For straight runs it's probably better as it's really straight and smooth inside. It's also readily available and cheaper. I used 1 1/2" for the projector and 1/2 for the speaker wire. If I could do it over I would have chosen larger conduit (3/4 for speaker wire and 2" for the projector). I had to use fish tape and lube (and patients) to get the speaker wire through. It was the bends that complicated things.