The junkyard home theater is complete.
The last two pieces were a different USB DAC (which supports optical out on the Mac) and a hail-mary shot at resurrecting (see what I did there? This entry was nearly titled “It is Finished”) an old DVD player I had on the shelf, retired after it stopped working a few years ago.
The G4 Mini simply cannot support hi-def audio and HD video from disc, but does ok with XMBC taking streams and tossing them out. Sadly, XMBC, although the root from which Boxee sprang, is straight-up terrible in terms of UI, and the version I am using is prone to crashes.
Still, the objective here was to set up a surround-sound, Internet-connected and streaming-capable big-screen home theater for as little as possible.
It has been difficult to figure out the costs, but over the past month I have spent about 200 dollars, possibly 250. I had significant items in hand, however, specifically:
The projector (dumpstered in 1999 or so)
The amp (an entry-level Sony, made around 2002: no hdmi)
The computer (a first generation G4 Mac Mini, no optical out, underpowered in every way)
Cables
Experience (see below)
Setting up a home theater requires knowledge of multiple, and multiplying, connection protocols. I find it murderously enraging to keep on top of it, so mostly I don’t. Having experience with this particular area of greedy nonsense helped. I’m certain acquiring the knowledge abraded away an appreciable portion of my “don’t be an impatient and abusive asshole” coating.