I've got an SVT-CL and a SVT-410HLF. I was wanting to add the SVT-15E to the rig, but having read about the differences in Ohms, I don't think that this is possible. Does anyone have a similiar rig (two cabs, one being the svt-410HLF with an SVT-CL) or can advise me on a 4 ohm cab to go with the...