Sub: Still undecided, wanting to see if the 70's produce enough oomph for me.
If no sub, make sure the receiver "knows" that so that the LFE can be rerouted to your mains (but that assumes they are left as fullrange, and well . . .). This signal will be greatly reduced to protect both receiver and speakers.
- How do I connect the speakers? Will they just work when I connect them or do I have to do some sort of setting or tweaking?
If bare wire, twist the ends. Make damn sure there are no whiskers coming out that may short.
- "I should always, Turn on projector, then receiver, then components" in that order, so as to avoid problems... is that correct?
I do my amps/receiver first so that the big initial draw won't affect my other components. Between other components and PJ, I don't care about the order so much. Amplifiers draw the very most at turn on, to charge the caps, so far as I know.
However, there are some older components out there that are not so good with HDCP/handshake, and if that's the case, sometimes you may have to find a certain power up order. However, I'd like to believe that by today this is rarely required.
- Will I be able to attach my computer to the receiver and get video/audio? I have an HDMI Out on my computer.
If the computer can send audio via the HDMI, and that you won't have any sort of funky HDCP issue, then it should, I imagine.
- Finally... placement. I know I have to put the center below the projector screen and the towers flanking either side. But how do I calculate angles, height, etc in order to get optimal performance?
Best height is to typically have the tweeters at ear level. After you do the best you can there, but they are still a bit off, you can angle them so that they are directed towards your ears. I believe, in general, it's often better to have the center over the screen, but this depends on many things: how big the screen is (how many ft available both below above screen), your distance to screen, etc.