I have a Marshall 410H JVM head going into a MG series 4x12 cab. The speakers are rated at 8 OHM's There are a 5 different inputs to connect the head to the cab. I have it connected in the 2x16 OHM input. the other inputs are: 1x16 OHM, 1x4 OHM, 1x8 OHM, 2x8 OHM & 2x16 OHM. So which one is the correct place to plug in??? Or does it matter.