I have an amp that has 2 speaker outs that say 8 ohms under each output jack. I assume I can't connect a 4 ohm speaker, only 2, 8 ohm cabs = 4 ohms. Could I use the 810 in split mode running 2 speaker outs from the same amp? Examples in the 810 manual show 2 separate amps in split mode. Could I also use just the top 410 only @ 8 ohms?