Subwoofer pairing with new Magnepan .7's


Greetings! I've just set up my new Magenapan .7's speakers and are really enjoying them. I'm feeling that they would benefit from some bass augmentation. I'm asking what subwoofer pairing have been successful with Magnepan speakers? My amp is a Rogue Sphinx currently. 
Thanks!
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I'll probably get laughed at for this..........
We used a pair of the B&W PV1D subwoofers with a pair of 1.7's were I used to work. Once tweaked we were all really surprised of how well they worked together.