One of the pieces of advice I always give to magicians is to get a microphone and use it. Most magicians don’t realize how quiet their talking voice is. Sure you can yell at the audience and many people do, but that’s only good for up to a couple dozen people if you aren’t in a formal theater situation.
When I drive to gigs I always have a battery powered speaker in my car. It’s saved a ton of gigs. I use a Roland Street Cube EX:
This little speaker has enough power for a school assembly, and it’s nice a small!
Here’s the advantage to having a speaker like this: It’s versatile! What I mean by that is that I can use it as a speaker. However if I need to I can use it as a mixer, and more importantly I can use it as a stage monitor! Many smaller events will rent a sound system, but it’s just two speakers on a stand, which will work in a ballroom, but lacking the monitor, that’s where this speaker comes in!
If you don’t know what a monitor is, basically is a speaker on stage that allows you to hear your self. It keeps you from yelling and it will save you voice! When the sound guy asks always tell them you want some of your voice in the monitor!