What is an active subwoofer?

After entering the family cinema era, due to the development of the surround multi-channel speaker system, the subwoofer must have a built-in amplifier for the drive unit, so the active subwoofer is immediately flooding the market. Thanks to the built-in amplifier, a low-level music signal (connected to the RCA terminal or XLR terminal) can be obtained from the subwoofer output of the AV surround amplifier. In addition, the general active subwoofer will also have a high-level input and output terminal, which is to use the speaker cable to connect. In the use of a home theater, the subwoofer cannot be connected by a speaker cable, because the AV signal output is output via the low-level RCA terminal or the XLR terminal, whether it is an AV surround amplifier or an AV processing preamp. Not output from the speaker cable terminal. In the case of a two-channel speaker plus a subwoofer, the user can transmit the music signal to the subwoofer through the second output of the front stage, or connect the subwoofer to the speaker output of the subsequent stage. .