Maggies and subwoofer integration

I'm running a Schiit Saga+ into a B@K EX 422 Sonata, into MG-1 maggies. Wanted to add a subwoofer, and was wondering if by just using the second output on the Saga+ to the line level input of the Velodyne Sub I have, would just be adding bass heft to the MG-1's, as there's no built in crossover in the Saga+?

I would optimally want the Sub to takeover from around 60HZ, and aleviate the bass duties of the maggies.

Would it be a waste of time and no real benefit? Would running the signal from the B@K directly to the subwoofer be any different regarding the delineation of the frequency duties?

Thanks in advance for your help.