Get a REL sub. It connects to the speaker taps with a Neutrik Speakon cable. No need for a specific sub tap.
Sub woofer naive question day
I am a geezer and have had decent audio equipment for better than fifty years. But have never owned a sub woofer. What is the proper way to implement the speaker into a system with an integrated amp that does not have a specific sub tap? The amp has a line out and a pre out.