1. Avoid background noise - Listen to the environment before shooting.

This might sound obvious, but try to capture your recording as clean as possible and try to avoid any background noise. Bring your microphone(s), recorder and headphones with you and check the location before shooting. You want to reduce ambient sound (traffic, wind, background conversations, aeroplanes, construction works etc) as much as possible. Listening through a microphone with headphones is different then listening with your ears. Your subconscious blocks out many sounds like humming refrigerators, air conditioners and even the sound of a clock ticking. So turn off all noisy electrical appliances while shooting. 

2. Listen to the acoustics

Recording in a room with a lot of echo and reverb can be tricky. Especially hard and smooth surfaces like tile floors or bare walls can result in unwanted reflections. You might need to adjust the location so that sound waves are absorbed. You can use sound blankets or use materials like mattresses, towels, carpets, clothes to create obstacles or walls that minimise the ambience.

3, Use quality headphones

Microphones are very sensitive. Any movement or noise in the room will be recorded and can cause unwanted sounds. When you use your ears to listen to the sound the on set, a lot of these sounds won’t attract your attention. By wearing proper headphones you will only hear the recorded sound. This way you will notice if any unwanted sounds are recorded.

4. Record a room tone

After recording a clean dialogue, don’t forget to record what is called a ‘room tone’ or ‘wild track’. Ask everyone to stand still and be quiet. Record 60 seconds of the ambience. Also make separate recordings of individual noises that happen during the scene. Now you can build up layers of audio and adjust the levels independently to create a convincing mix.

5. Get rid of low-end noise in dialogue recordings.

All microphones sound different but, except for epic, dramatic voiceovers, anything at or below a frequency of 80Hz can be rolled off. This way you will get rid of rumbles, hums, wind and other low-end noise you don’t need in your dialogue

6. Add presence and brilliance to your dialogue.

If you want to add some brilliance, sparkle and clarity to your dialogue you can boost the 4KHz frequency by just about 1 or 2db. Does the dialogue sound boxy or muddy than reduce the 250Hz frequency by the same amount. Make sure you don’t cut or boost frequencies to much, because this will make the sound unnatural.