Passive speakers are audio devices that require an external amplifier to produce sound. Unlike active speakers, which have built-in amplifiers, passive speakers rely on an external power source to drive them. This design allows for greater flexibility in sound systems, as users can choose amplifiers that match their specific audio needs. Typically, passive speakers consist of a speaker driver and a crossover network, which divides audio signals into different frequency ranges. They are commonly used in home theater systems, professional audio setups, and concert venues, making them a popular choice for audiophiles and sound engineers alike.