i apologize. i know its been covered. but i just want to be sure. i have mac 2105 and cab with 2 e120s, 8 ohm each. back of mac is right and left channel connections labeled C, 4, 8, and 16 and connection spots on each end with no numbers above, which is to the left of 0 and right of 16. so where am i going to? 1/4 jack is in the back of speaker cab and 2 things to screw into mac, one with white wire, one black. one on c and one on 8?