i love internet wars
and i always put at least two mics on a guitar cabinet,
main reason: there's always a lack of time here, so most of the time i put an
Akg 414 and an Md421 (rarely a 57) on the same speaker,
both mics go trough a different preamp/eq,
i do this not with the intention to really use both signals, its makes me work faster, when i record, and we all listen to the take i switch from mic1 to mic 2, and i just use the best sounding take ,
of COURSE i do a few test recordings, move both mics a bit around,
i've had real nice results with just using One of the mics, copying it to another track , pan both signals hard L+R and give one of them some delay , the phase difference often gives a real nice character to the signal,
i work with amateur bands, most of them have a REAL HARD time playing their thing in one time, we're always happy if we finally got something usefull,
so mostly its too difficult to really try "doubling", they just can't play the same thing twice, they always fuck up, so we loose ALOT of time cause the guitar players aren't good,
sometimes i even put three mics in front of the amp,
i make one sound as natural as possible and the other two get tweaked real hard, in the end i just choose the best sounding track and sometimes i mix them... DEPENDS..depends...depends..
and weird thing, i heard so many people compliment the akg414 on guitar cabinets but i don't like it, the 421 sounds so much more solid, less harsh,
i've noticed that with different amps (tube/transistor), different preamps (symetrix 528, M8, joemeek vc8, a big digidesign thing...)