i just got a mesa cab and on the back it has outputs for 4 ohms, 4ohms, ( don't understand why there's 2 but i assume its for stero operation) and 8 ohms. its an oversized recto. i also have a vht cab that only runs 16 ohms mono. so how do i run these 2 cabs as a full stack out of one head. would i set the head for 8 ohm load? or no, i know if they were both 16 ohms i would set the amp for 8 ohms but not sure what to do with both being that they are miss matched