bob, or anybody else who can help me....i just bought an rmx 850, and i cant get any output from it. im running into a hartke 2000 head, out the effects send, into the input of the amp via 1/4", then out channel 1 via speakon, into a bag end 210(4ohm) via speakon. i have the speakon wired +1 +2 at the amp, and +1 -1 at the cab. this is correct, right? i followed the manual, ive got all the jumpers set correctly as far as i can tell...the signal LEDs light up, and i can clip the amp if i play hard enough, so i would guess that a weak input signal is not my problem. ive also tried using a y cable to run a signal into the effects return. nothing. what else do i need to do to make it work?