Firsty, I apologize for this thread because I know speaker impedance has been threaded to death on these forums. My question is: Can I safely run my Gallien Krueger 400RB IV @ 280 watts (4 ohms) into my Ampeg 4x10 cabinet @ 500 watts (8 ohms)? From what I understand it should be fine, the head will just use less then the 280 watts of power? Is this correct? Also, if I wanted to, I could run two 8 ohm cabinets with the head and it would half the impedance of each cabinet to 4 ohms?