So I'm up late last night and I get an urge to noodle around. I usually run my pedal board into my mixer, my mixer into my headphones. But last night I thought maybe I'd just plug my headphones into my amp and play with my amp's EQ for a change. Surely the MB500 had a headphone out. It did! But when I played, my cabs still made noise. Not what I had in mind for a silent jam in the middle of the night. I consulted the amp's manual and to my surprise it says 4 Ohms, 8 Ohms and no load are all OK. That is, I can unplug both cabs from the amp and still run it. That way, I can get the headphones working but have nothing come out of the cabs. Am I the only one who didn't know this was a thing, no load being OK?