Hi Sgm, you do not share either the nominal ohm rating or the efficency rating of your C4's. That would be helpful to give you more of an accurate answer. I bi-amp my MG-20's with XA-60.5's that have all the current I need and do double down into lower impedence ratings. I too first considered the XA-100.5's, but saved alot of money, when I did the audition and found out the 60.5's could easily handle the load. My hunch is they would also work in your system. Take a look at my review of the XA-60.5's here on the GON.
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