There are so many sources that result in blurry sound. It is almost always an amplified instrument. Most of the time these comes from guitar amplifiers. Another reason is because guitar players always turn up their amplifiers after the first song because they find it hard to hear themselves as they begin to play those first few chords. One way to get rid of this problem is to give the guitar player more of his guitar sound on the monitor mix. This way, he won’t be always turning up his amplifier because the sound that he hears would be loud enough for him. This way, you would be able to get a clear and legible vocal sound over everything else. The reason is that the guitar and vocal frequencies operate within similar ranges, but volume onstage; you will have plenty of gain before feedback with your vocal channel at the front of house.
So if you wanted your performance to sound good on stage, follow these simple tips and you can be sure, you would have fewer problems. Just remember that a well balanced mix is much more favorable. It makes the whole sound of your performance clean and clear.