Bob Bickerton wrote:Using just a stereo pair will limit your options to tweak the balance...
I get where you're coming from Bob, but I have to disagree on this point. it's very easy to get a singer to take a step back or forward to adjust the overall balance from a stereo array, if necessary when listening to a rehearsal.
It doesn't have to be a static move either; it's quite possible to ask a vocalist to step in or out for the verse, chorus, single line, or whatever... Or even to turn their head off-mic for a specific word or syllable. Masking tape on the floor helps to mark the desired physical positions, of course, to ensure consistency.
I'm with Sam and Jack, basically. Far too much emphasis is placed on 'separation' and 'fixing' balance issues in post-production, when often 'separation' really isn't a concern at all, and a much better musical performance can often be obtained by 'fixing' any balance issues in the studio before hitting the big red button!