Topmusicanswers
By combining the outputs of both mics at equal gains but in opposite polarities, the similar level of ambient noise from each will cancel to a very large degree, whereas the significantly different levels of the wanted close sound from each mic will hardly cancel at all.
Can you record vocals with 2 mics?
Decide on Mic Placement
If you do want the two mics to be virtually exchangeable, keep their capsules close together while keeping them in phase as much as possible so that the vocal hits them at the same time. Many engineers will flip one mic upside down and position them grille-to-grille nearly touching.
What is a double microphone?
Double mic'ing is using two discrete microphone channels (a primary and a backup) to ensure consistent and uninterrupted audio in case the primary mic goes dead or there's a wireless glitch during a presentation or performance.
