I ordered a Genz Benz 410-XB2 4 ohm cabinet this past weekend, with the intention of adding a Genz Benz 115T-XB2 (an 8 ohm cabinet) and GBE750 later on. After talking with a friend, he insisted this was not wise, because he had been told mismatching impedences can damage an amp. I know this 4 ohm and 8 ohm combination would give me 2.67 ohms (or 2.666 if you're xjasonsmithx ). My question is is this true? Would running uneven impedences damage my head, even if it could run at 2 ohms? If so, what are some possible solutions to this problem? Having the 4x10 rewired? Adding another 8 ohm cabinet?