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.
Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.