http://i38.photobucket.com/albums/e135/s....jpg(Note: See Figure Above)I have a pair of 8 ohm speakers that I want to plug into the slots circled yellow. I have a pair of 4 ohm speaker that I want to plug into the slots circled blue. Can I safely use both pairs of speakers at the same time if it is setup like this? How about if I plug the 8 ohm speakers into the slots circled green? Is there anyway I can safely plug in both a pair of 4 ohm and a pair of 8 ohm speakers into my reciever?