Turn down your guitar amp first.

Start by turning down your guitar amp. Most singer-guitarist feedback problems come from the amp being too loud on stage, not the monitor mix.

The guitar amp bleeds into the vocal mic, which makes the monitor system fight itself. If you pull the amp back to just above what you need to hear, you immediately reduce the feedback loop. Then angle the amp so it’s not pointing at the front of the mic.

Now build the monitor mix: start with vocals. Cut everything below 100Hz and scoop a little around 200-400Hz — that’s where feedback builds. Boost around 2-4kHz for vocal clarity and nuance. If you need more guitar in the monitor, add it after the vocal is stable, not before.

If you’re covering Julia Jacklin, you want her breathiness and dynamic range. That means keeping vocal mic technique clean — don’t cup the grille, and stay on-axis. If the wedge is still giving you trouble, a cheap set of in-ear monitors will solve it completely.

Your voice is the instrument that needs to cut through, not the guitar.