So, I have an Ampeg head that will hand a 2 ohm load (the Sunn died... bummer), anyway:

I also have a 2x15 4 ohm cabinet. I have a line on another 2x15 cab (a Traynor!) for about $110, word has it is in good condition, but the casters are MIA. However, it is running at 8 ohms.

Now, can I use both cabs in paralell as is? Is it possible to make the 8 ohm cab 4 ohms, and would it be better to use two cabs at 4 ohms a peice?