Amazon.com: BESTISAN Powered Subwoofer, 6.5" Active Home Audio Subwoofer in Compact Design,LFE & Stereo Line Inputs & Audio Output, Built-in Amplifier for Home Theater/Receiver/TV/Speakers, Black, SW65D : Everything Else
HTD Level THREE Powered Subwoofer
What is the LFE input and When to Use the LFE Input | REL
Audio Equipment: Is there a method/device to connect a subwoofer LFE output from a stereo to a subwoofer that only has a pair of speaker-level inputs? - Quora