Here are the service manuals and such for the AKG HSD271 headphones with boom mic. Mine has no audio in the left ear and I have no idea why.
The Strymon Big Sky seems like a pretty cool reverb pedal but what I really like is the piece of music they recorded for this demo.
Sweetwater has a pretty good summary article on line arrays. If the inverse square law ticks you off, line arrays may be for you.