Understanding AB Miking
In an AB recording, two microphones—commonly omnidirectional, but any polarity can
be used—are equally spaced from the center and pointed directly at the sound source.
Spacing between microphones is extremely important for the overall stereo width and
perceived positioning of instruments within the stereo field.
The AB technique is commonly used for recording one section of an orchestra, such as
the string section, or perhaps a small group of vocalists. It is also useful for recording
piano or acoustic guitar.
AB is not well suited to recording a full orchestra or group as it tends to smear the stereo
imaging/positioning of off-center instruments. It is also unsuitable for mixing down to
mono, as you run the risk of phase cancellations between channels.
Specialized Effects and Utilities