I wanted to give a shout out to Tilman Ritter, designer/manufacturer of the Camplifier series, for his help in modifying my unit to work with a 4 ohm load.
I purchased a used C360 stereo 2x180 unit off of TGP. I was using it with 2 F12-X200 and was pretty happy. Then the Kone firmware came out and I realize that I was not going to be able to drive the Kones with the Camplifier without harm to the amp(in stereo anyway).
I reached out to Tilman, after he posted what was going on with his product line to support using the Kone, on this forum. I emailed him and asked if there was a way to mod the unit to make it 4 ohm compatible and that my many years as a tech in the defense industry would lend me the experience to do the work and not have to ship the unit to Germany.
He provided a PDF that shows how to mod the mono unit, but the instruction work the same for a stereo unt. Just follow the output wiring and it's easy to find the 2 channels.
My output was cut from 180W x 2 @ 8 ohms to 90W x 2 @ 4 ohms, but I use this at home and the volume reduction will not effect reaching my playing volume. It's still more power than the old Rocktron Velocity 150, I was using prior to this modification.
Email him here @ info@ritteramps.de if you're interested. Great guy to deal with. He's busy with the 4 ohm compatible product line, so give him a couple of days to respond. Most manufacturers would require returning the unit to them. I find this refreshing and great source of customer service.