If you own a premium powered subwoofer or are thinking of getting one, you may not need an external amplifier, unless you want to push the output to extreme levels. A passive subwoofer, however, cant work without an amp.

Can you use subwoofer without soundbar?

A soundbar doesnt need a subwoofer to sound good. Soundbars include multiple internal speakers that can sound great on their own, but a subwoofer helps produce low frequencies that many soundbars cannot.

Do you need subwoofer with Bose soundbar?

The Bose Soundbar 700 is an all-in-one soundbar, which means its a single-box system with no external subwoofer (although one is available separately, as you can see in the official pictures gallery).