I have the predecessor to the 936 - The Focal Chorus 836V. Similar impedance dip. I currently drive these with a Marantz PM11S3 which doubles from 100@8ohm to 200@4ohm. These sound amazing together. I bought my amp used for $2,400.
Prior to the 11S3, I used a Marantz PM8005 with good results ( and can usually be found used for under $800). I would not hesitate to look for the middle sibling in this range, the Marantz PM14S1 which you can usually find used for $1,200-$1,400. Its predecessor, the PM15S2 (same specs as the 14S1) is often available for under $1,000.