Use your fig-8's one per, but put each's null aimed at the other's source direction to minimize the bleed in each of the mics.
'Rule 1 (they're not rules per say, common known guide lines..
1 'Room/ambiance mics that are placed back far enough to have primarily the random 'reverb and reflections- less direct sound, aren't a source of phase problems.
2 The obnoxious phase problems are from out of time direct sounds.
3 Record the close mics as a coherent stereo pair, = zero out of time arrivals.
4 Or record 1 mic voice 1 mic inst- accept the bleed embrace the phase effects.
5 Use your fig-8's one per, but put each's null aimed at the other's source direction to minimize the bleed in each of the mics.
..6 of course, overdub.
add.. Regarding number five- This works much better as the distance between the voice and guitar is farthest- I.e standing, guitar slung lower. Sitting, 'hunched over the guitar... 'Fa get about it.
That changes things a bit doesn't it. The dual fig-8 thing was suggested as something available to get some isolation on a single player singer. Now you're back to the normal situation, the default (starting point), is pick the best mic - and placements for the tones you like. 'Phase between separate players mics, bleed etc become less of a concern as the distances between them -if adequate, makes the effect of the cross bleed lower in level! The 3:1 rule' suggests cross bleed below around nine db or so below the primary signals is enough to make the out of time effects not audible.thanks for helping this is good information. i forgot to mention, which was stupid (sorry), that i am playing the guitar and my friend would be singing along at the same time, so it's two people in the room. would the same rules apply?
for now based on everything i read i am thinking i should use the figure 8s and not the condensor mics, put one on my guitar, one on my friend's voice, and use the null areas to minimize bleed. is that right? should i make my friend and i far apart or closer? is there an ideal distance? also, if there are two of us, does that change any thoughts on micing the room vs using reverb later? thanks guys