So I have a Marshall AVT50 1x12 combo. Can I unhook the speaker cab and hook it up to an Orange Micro Dark? The impedence of the Marshall is 4ohms and the Orange is 8ohms. The manual for the Marshall says you can hook up an extension cab as long as its 8 or 16 ohms. Does that mean the speaker in the combo is 8ohms? Wattage shouldn't be a problem as the Marshall is 50watts and the Orange is 20. Any advice would be appreciated.