I am absolutely beside myself!! I have a 2000 DSL and I have a 412 Cab the has 4 - 16 ohm speaks in it. The cab has 2 inputs, 8 ohms a side. I have been running my Marshall with 1 speaker wire in each of the 4 & 8 ohm Paralell Jacks to each of the 8 ohm inputs on the cabinet...WITH the OHM switch on 8 OHMS!! Let's see, since I got it 4 months or so ago!! I JUST happened to DL the Owners Manual today, and it said that for the load to be 8 ohms with 2 speak cabs they are 16 ohms each. I was like WTF!!! I thought I was so smart too everytime i checked the switch to make sure it was on 8 ohms! So basically if I am running 2 x 8 ohms speakers (or 1 - 4x12 split stereo 2- 8 ohms) and using both jacks I need to have the switch on 4 OHMS?? Does anybody know? I am almost sure now that is the way it is supposed to be NOW! Can anybody tell me what I might have F'd up in my amp head?? It still works, but It was cutting out when it first fired up. IDK I am just furious with myself! Please any input would be appreciated, I would really want to discuss this further, so I know how bad it is! I only used it for 6 shows (4 hours each) and 20-30? practices..... Ouch!