Going direct to the amp, you will lose the wonderful tube tone the F1X provides.
I never run my stereo amps in stereo. I bridge them to get the most power, and from the mono out, I run 8 ohm or even 4 ohm cabinets in series to also increase the power of the amp. I have been using Carvin DCM3000L amps for the past few years, and find them to be the best I have ever used. ( I know, I too said I would never own a Carvin product). I have had Trace Elliot RA 500s, SWR 800s, CrownXLSs, QSCs, etc. The Carvin is faster, more powerful, runs cooler (even at 2 ohms), weighs only 14 pounds, and is affordable. I have used them on the road, dropped them, and generally put them through hell, and they are absolutely reliable and have never failed in any way. The deal with the Carvin is you want to make sure you are using the 3000 or the 3800 to insure you have one of their class A/B power amps. Digital stuff is not even close to the same, and they make plenty of models that look the same, but are not class A/B. That ultra quick reacting solid state amp with the smoothness of an F1X or F2B is just perfection.