https://www.crutchfield.com/S-YMAiep...-low-pass.html

Come in quite a range. 200hz is one of many. You could do it all with passive filters.

Most sub-woofers are configured as pass-through devices. Feed the full signal to the SW, and the filtered signal from the SW to the rest of the drivers. If you have separate amps, similarly, but the output from the SW is filtered line-level.

Peter Wieck
Melrose Park, PA