I have some questions about the technique of recording natural reverb.
I'm thinking about playing back something I've already recorded
(single tracks, not mixes) out of a boombox and placing an AT4033 at
some distance away. I will be doing this in various places on the
university campus nearby. Most likely stairwells, long corridors,
tiled bathrooms, etc. Maybe I'll even get dramatic and try this deep
in the woods in the mountains where I live.

Is your standard $100 boombox of high enough quality to do this, or do
I really need a top quality monitor? Is an AT4033 a good choice for
this, or is the tendency to use sound measurement mics like the
Behringer ECM-8000? What kind of mic placements should I consider as
starting points? I've heard people recommend placing the mic close to
a wall to get some close reflections; or should I try to stay, on
balance, as far away from the walls as possible? What about the
placement of the boombox? Is it ever worthwhile to bother changing
the EQ on the boombox--I realize this is very case specific. If I do
decide to trek out to the woods, can a battery powered electret mic do
a decent job at this sort of thing? Is it even worthwhile to try and
get a "woods reverb," or a "canyon reverb?" Any other type of
environments that have yielded good results? Mostly, I will be using
this on guitar solos and vocals.