Arxon scandoubler is 24bit, I had one and I could compare it to internal Phase5 ones, so don't worry. It is 24 bit!
phase5 CV3d scandoubler was not 24 bit. Load a demo like TBL/Rain and you will notice it.
Maybe they changed the design in latest DCE stuff, but the original phase5 scandoubler was not 24bit. Colours looked crap compared to a 24bit scandoubler like Arxxon or Picasso4
