Sound quality is especially important in interviews. The audience will be concentrating more on what the guest is saying than how they look. Without crystal clear sound your interview may irritate the viewers.
The amount of background noise contained in the recording will affect the clarity of the words that speaker says. The movement of people in and out of the room; passing traffic; sirens; music; additional background conversations; and even the sound of an air conditioner may also muffle the voice of the speaker.