One of the rock bands I work with loves loud foldbacks (well don't they all" id="smiley" src="https://guitarcenter.i.lithium.com/i/smilies/16x16_smiley-.png" alt=":smiley:" title="Smiley Very Happy" />). For the last couple of gigs I've been giving them two foldbacks per microphone/vocalist. Prior to this it was just one.
I mainly use EV SX300s for foldbacks run off Yamaha P7000 power amps. I just doubled the speakers on each amp channel - so they are know running 4 ohm loads per channel which I believe may provide some advantage.
The band is very happy with this new arrangement as it seems to provide more clarity with less feedback problems (Its obviously more gear and more work for me so I am thinking of charging them a little more).
It got me wondering if in general it is true to say that two foldbacks speaker per vocalist are better than just one?