Maybe I'm missing something, but I don't think that you can connect those two together. The Zoom is an Fx, with no amp, and the Markbass is a cab, that needs to be driven by an amp. The connectors on the cab are SpeakOns, used for connecting amps to cabs; the Zoom has no such functionality. You will need an amp of some sort, preferably one with a SpeakOn output connector, to enable use of a simple double-ended SpeakOn lead between amp and cab. The Zoom would be plugged into the input of said amp. Hope this helps, and apologies if I'm wrong.