I use the Holo Serene preamp with the CODA #16. I had the CODA 07x preamp before but prefer the utterly silent Serene. I sometimes move the CODA #16 to the system with the Benchmark LA4 preamp. In fact, the LA4 was the preamp I got after selling the 07x. Again an utterly silent preamp and love that too.
The CODA #16 would pair well with the BE drivers on the Focal. Though I would likely look at a warmer speaker such as a KRELL Dou 300XD. I used the LA4 with both of those amps and loved the sound.
Another amp that may work well with the Focal based on how amazing it is with my Magnepan LRS+ (as is the CODA #16 with the LRS+) is the Sanders Sound System Magtech. It is not Class A smooth like the KRELL and CODA but the pairing with the LRS+ is incredible. It really does not offend in any way, I get ear fatigue easily with bad sound. The LRS+ sounds better with a lot of watts and current which both the CODA and Magtech provide. I forgot if the Focal is also a power hog. The KRELL is equally powerful but never heard with LRS+ (it should be great).
@mattlathrop Send me a DM if you are interested in a CODA #16.