Hi all! I made a speakon cable unsing NL4FC connector on both ends for bridging operation. I use a cable that have a white cable and a black cable. For bridge operation, the amp says 1+=+, 2+=-. White cable=+, black cable=- I wire the connectors and tested, no sound. I have another cable that one end is speakon and the other is 1/4" type, and works fine. What I am doing wrong? Is there one end combined like 1+=+, 2+=- and the other end 1+=+, 1-=-? The amps that Iam trying is a SVT4PRO, and a QSC PLX thanks for your help.