Adding a subwoofer into my system

I currently use a Wharfedale SW150 subwoofer and a Yamaha AV amp in my TV system, I would like to give the sub a try in the audio system which comprises : Cambridge Edge NQ streamer, balanced cables to a McIntosh 275 amp, speakers are Harbeth C7-ES3 using the 8 ohm posts.  What would be the best way to introduce the sub ??Merry Christmas and happy new year to all - stay safe