#1
Hey guys,

I've got a band called Anti Icon (www.myspace.com/antiiconmetal) but we have some vocal problems.
We got a singing installation with enough wattage (i think) but our vocalist just can't get over the guitars and drums.

We thought it might be the cables.
Now a friend of mine told me a XLR-cable sounds louder and better, is this right?
thanks anyway!

Rien, Belgium
#3
XLR cables will only work if your mic has an XLR input (by the wway you worded it you lead me to believe you are using 1/4 inch jacks)

and secondly, cables are not the problem most likely, its is likely the way you have wired up your system
#5
The cable really isn't going to make any noticable difference. Try EQ'ing the vocals, with a boost at 3kHz, which will help them cut through, and cut those frequencies from other instruments.