You need a tight fast subwoofer that will need to be able to be crossoved over at 40-60hz to get it to match well. Vandersteen subs with the sensing cables or Rel (a bit overpriced) maybe a JLAudio F112 might be fast enough (give it a listen). You also need a pretty steep crossover slope 18/24dB. The James Subwoofers are fast enough also.
You will be really happy with the results of mixing a sub with the Magnepan, it just has to be as fast as possible.
You will be really happy with the results of mixing a sub with the Magnepan, it just has to be as fast as possible.