Guitar55

Hi Myles, A friend lent me a Marshall JCM 900 50 Watt Hi Gain Dual Reverb 1x12 combo. The impedance switch on the back is labeled "8" on one side and 4(16) on the other. The manual says the combo is set for 8 or 4 ohms. So what does the "(16) mean? Can it be set for 16 ohms and,if so, how? Thanks, Dennis