And it doesn't seem to have worked. I'm trying to connect my GK-1001RB to my Ampeg 610HLF. Quarter inch works, but I want the security of Speakon cables. I bought a pair of connectors (NL4FX) as I have lots of speaker cable lying around. It was pretty straight forward, one wire (white) to 1+, the other (black) to 1-, same on both ends. When I tried it, I got no sound from my GK and the red light stayed on. I went back to 1/4" for practice, and when I got home tested the cable with my multimeter. White screw to white screw, black to black, checks out; fully assembled I get the outside top connector to it's twin on the other side, and the inside left connector to it's (this is with the locking jack facing left). What gives? The Ampeg is wired 1+ 1- as stated on the jack. Does something about the GK biamping need to be wired differently (I don't use it)? Do I need a different connector? I'm puzzled.