Your message you have spent hours on in preparation is not being fully heard. I believe there is a solution. I believe this is an area we need to be better at if we truly believe that our message is important. It is critical that the correct microphone is used, that the amplifier is adjusted for the clearest sound at the correct volume, and that the loud speakers are placed in such a way that the audience can hear, and the equipment can still function properly. Since most microphones look similar it is important to know the different types and how to select the right one for your specific application.
Unidirectional microphones pick up loudest on the front side.
As you move around to the sides and on toward the back, their volume tapers off. The unidirectional microphone's main advantage is feedback control. These microphones reject sound on the back side, which reduces the chance of feedback occurring. These microphones are desired for public address systems. When using a microphone for a handheld solo you need to teach your vocalist to hold the microphone below the mouth at about chin level.