What is a significant characteristic of condenser microphones?

A significant characteristic of condenser microphones is that they require a power source to operate. This necessity arises because condenser microphones convert sound waves into electrical energy in a manner that relies on a capacitor's ability to hold an electrical charge, which is critical for their functionality. Unlike dynamic microphones, which generate an electrical signal through electromagnetic induction and do not need external power, condenser mics need either battery power or phantom power supplied by a mixer or audio interface. This makes option B the most accurate representation of a key feature of condenser microphones.

The other options do not hold true. While some condenser microphones might be lighter, not all of them are inherently easier to handle when compared to other types of microphones. The statement regarding directionality is also misleading as condenser microphones can be designed to be omnidirectional, cardioid, or hypercardioid, depending on their construction and intended use. Finally, while some condenser microphones can be battery-operated, they are not always battery-powered, as many are designed to operate with external phantom power, further solidifying that power requirements are essential for their operation.