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Please help with GK MB 150 E Head

Hi

I have a Galllien krueger MB 150E head, but not the manual.

So, i dont know how to plug the cabinet for 8 oms.

In the back, the head have two plugs but there is only one text for both:

4 oms minimun (8 oms minimum with internal speakers on).

In the place that should be the "internal speakers on/off swtch" there is a black circular rubber blocking a hole and the text "Internal Speakers on/off". The guy said that it comes in that way from the factory because this model is not necesary to switch..., but i dont remember if a got to plug the cabinet in the right or the left plug...

thanx
mat