The Marshall vba and DBS 7400 will run a 2 ohm load with no issues
I use two 4 ohm Marshall cabs and either a hartke lh500 or Marshall 7200 DBS head (which need a maximum 4 ohm load) with a cable that runs the cabs in what was described to me as series parallel. Apparently the heads 'sees' a load of something around 6 ohms. This is what my amp tech tells me!