I have a 6.1 receiver (Onkyo SR600), and I'm wanting to wire for a 7.1 system. I'm wondering if I can take the 6th channel, and somehow split the sign and send it to the two rear speakers. My receiver says it has a 6 ohm minimum, and my rear speakers both say 8 ohms on them. So, does that mean I can't do it, because it would be splitting the 8 ohm signal into 4 ohms and 4 ohms? I'm just guessing here.