i know this i gonna sound like i'm dumb, but when it comes to this stuff, i admit that i am. i have a mesa/boogie 400+ head and a bag end 210 cab. the cab is 4 ohms and there's a 4 ohm output on the head. i'm thinking of adding a 15" cab to this setup. the 15" cabs from bag end are 8 ohms. there's 8 ohm outputs on the head. so i plug the 4 ohm cab into the 4 ohm jack and the 8 ohm cab into the 8 ohm jack. is that correct. i know things can get weird with tube heads and impedance, that's why i'm asking. thanks in advance, and again sorry if it's a really stupid question.