I am a Marshall guy ( have 1960AV and 1960AX cabinets ). I get it when it comes to understanding the 1960AV connections : move switch to mono and connect speaker cable from amp's 16ohm setting by plugging it in the speaker's input on the right SIDE that has 16ohm labeled on top of it. With that said, I do have a Hiwatt 4 X 12 model SE 4123 cabinet which has two unlabeled input jacks. So, now I am clueless on this one ! So here are the possibilities but which is right ??? 1. can like the 1960AV, the cabinet be stereo in which case 2 inputs from the amp are needed, But, there is NO SWITCH to select the option! So if you want mono (which I always do) just one input needed ? 2. just one cable from the amp, the other input is for connection to another 4 X 12 (sort of doubt this, in a stack doesn't each cab have its separate connection from the amp and NOT one speaker to the other ?) 3. this speaker cabinet requires 2 cables for the amp, one in each input - probably no I cannot find an answer on the net (no discussions or manual) about what the purpose of the 2 input jacks are for, and the cabinet is no longer on Hiwatt's website. I e-mailed them but still awaiting an answer.