The placement of furniture and posters can impair the acoustics of your classroom, making it more difficult for students to understand your words. Even your placement can interrupt the sound waves and make it difficult to comprehend your words. Turning to face the students as you speak can yield immediate results. Take a break in your lecture when you need to turn and write something on the board. Move all posters and tapestries to the front of the room so they are behind you when you speak.
When working with children that have diagnosed auditory problems, it may be reasonable to use technology to increase the power of your voice. A small speaker system with strategically placed speakers may help children with hearing disorders understand what you say. Practice using the microphone before you introduce it into the classroom to ensure you have the proper skills. Wearing certain metals or holding the microphone improperly can impair its ability to impart sound to your students.
Reintroducing the same information repeatedly can help children catch the information. Finish every lecture by giving a brief summary of the information you convey to keep the children up to speed. Hand out written prompts with the information as well so the children can link what you say to what is on the page. Take moments to ask questions of your students. Having a child repeat the information aloud may help the other students to catch and digest the information.
Auditory perception can improve as you remove other stimuli that distracts from the subject. This includes closing windows, removing classroom pets and taking down distracting posters. Keep a tight rein on your students to ensure they aren't the reason for the distraction. Whispering and contraband devices can make it difficult to hear you as you perform your lecture. Talk with the principal about solutions to noise problems outside of your classroom as well.