A semi-spherical area. Usually in reference to a secondary (not intended) area. For example, a hypercardioid microphone will pick up sound in front of the capsule, but will exhibit a rear lobe where sound is picked up, too. Lobes occur in speaker clusters as well.

Source: [http://www.allchurchsound.com/ACS/glossary/index.html Church Audio & Acoustics Glossary] [[Category: Acoustics]]