I just did it simple: ran the internal speaker cables from the amp onto a jack on back panel ONLY and the original spealer wires out of the chassis and ending in a plug. Now I can use the mph as a head with regular speaker cables, but if I want to us it as acab for other head, i can plug direct to another head. And no possibility for wrong connectilns in any way. Since its ss dknt even matter if there is no load by accident.