So I've got the GK Goldline head (500 watt, lower end head) and the MBX 4X10 cab (400 watt). I've also got an old Earth 2X15 cab but it's only got the one 15 wired up. It's an Eminence Legend (8 ohm, 300 watts).
Both cabs are 8 ohm which should give me a 4 ohm out of the head.
Recently (ish)...