I used my Mackie 808s for an out-door event Thursday. I couldn't get my Carvin AG100d amp to work behind me as a monitor. I was trying to use the Monitor 1/4" jack on the front of the Mackie cabinet just off center to the right near the bottom.

Today, I got the Carvin to work off of the last 1/4" jack on the back of the Mackie looking from the back, but for some reason only channel 7 and 8 worked. The other 6 channels were dead.

I know at least one of you guys has this unit. Hope you can help.
Thanks a bunch,
Boo