Is the RZ810 rated down to 4ohms? In the spec sheet it doesn't show that it is compatible, but in my on-screen adjustments, it shows that it can go down to 4ohms. I'm swapping out my ELAC Debut front L/R for a pair of Martin Logan LX16's (rated at 4ohms) and want to make sure I don't do any damage to either of AVR or speakers. Thanks!