What is the difference between active and passive subwoofers?

[Mildred]

The main difference between active and passive speakers lies in whether the speaker has a built-in power amplifier. Here are the specific details: Active speakers: They have a built-in power amplifier circuit and can work once connected to a power source and signal input. There is a set of circuits inside the speaker that function as a power amplifier. For example, most speakers used with computers are active speakers, meaning they can be directly connected to the computer's sound card without the need for a separate power amplifier. Passive speakers: They do not have a built-in power amplifier circuit and require an external power amplifier to function. They can be thought of as "wooden boxes + speakers," which has the advantage of achieving the best sound quality without interference. Since devices like VCDs, DVDs, and computer sound cards do not include power amplifiers and only output audio analog signals, they need to be connected to a dedicated power amplifier.