With a Magnepan, you will most likely get a better integration between speaker and sub if you use a sealed sub. Rythmik L12 is a good option, as is the Outlaw (has sealed option, among others). It's always good to have sub flexibility, so you can alter the sound to suit the speakers and the room. Both these subs are flexible and would be a good choice.
EDIT: I see you have ordered the Outlaw. Congrats! Let us know how you like it.
It's a VIRTUAL channel unless stated otherwise.
Last edited by RayGuy; 12-20-2019 at 11:58 AM.