My point exactly. What
Fearful Symmetry said was so right. He gave the speakers the priority which is the correct thing to do. The way he has got two monitors set-up is probably the only way it could be done.
I have been into many very pro studios that only used one monitor as well so dual monitoring does not imply a professional set-up at all.
The problem with two monitors in a desktop set-up is exactly as
sharke mentioned, it forces the two speakers too far apart. A problem I see with many set-ups that are pictured here on the forum. This is bad and the speakers really need to be totally equilateral in that speaker distance to you should match their distance apart. You are doing yourself such a dis service by having them too far apart. You will be pushing centre panned things up harder than they need be as a result. This is because your centre image is weak. When the speakers are the correct distance apart and you switch to mono you should hear the ghost between the speakers very well right in the centre. If you cannot you are not set up correctly.
(This test needs to be done with your eyes closed as well and two friends need to be able to slide your monitors slowly apart. As soon as the main speakers are even moved very slightly the ghost disappears and you are left with a weak centre image. Then you just slide them back until it re appears again) The software decides how well you can work with a single monitor and some programs are way better in that area. Sorry but true.
The ideal thing is a single monitor
(or something like Fearful Symmetry's setup) with the main monitor on a reticulation arm so for critical listening in mixing and mastering you can easily push it way back behind the main speaker line.
As I said in my first post when you shift your emphasis into the audible and listening you just automatically start shifting the emphasis away from the visual and looking.