Miking a guitar amp, my take
Id like to share my amazing amateur wisdom on recording a guitar from home with 1 mic. According to Steve Albini, close miked amps started due to small stages not having enough room, and it became precious real estate. Possibly true.
But Ive found that a little distance sounds 10x better, and you can't unhear it once you do. I mean distance as in 3" with an audix I5, similar to a SM57. After a few days of experimenting, moving mics around, I found 3" away, at a slight angle was a great sound.
You have to play with headphones in, moving 1/16" at a time to find it. My amp and mic are on a coffee table, with packing tape holding the mic down. I also have cardboard with a cutout that fits horizontally in to the mesh area. The cutout has the exact mic placement in case I move or change anything. (Imagine a flap with a section cut out, the size of a mic)
I experimented with multiple mics, but got sick of dealing with multiple tracks, comb filtering, etc. Nugen makes a plugin for that, it works great, but its an extra step. That extra time takes away from writing and recording IMO.
If you watch a YouTube demo of a pedal or amp or something, it rarely sounds good to me.
So for the home recording people out there, stop shoving the mic in to the tweeter. Pull it back a tad, a touch of reverb, and you can hear the entire speaker bloom. But if you record in a small room, you dont want room sound. Just enough, so your recording sounds the same as sitting ear level a few feet away.
This may be genre specific, maybe metal guys like that sound and layer it. Im more of the grunge, blues type.
Long rant, but for people recording an album in a bedroom, I hope this helpful.