I didn't make the cable, I bought it. a video amp is not necessary for all applications. It kind of depends on a lot of factors. If you want another output I would recommend double splitting on the master side... Like take a jamma edge capture device (such as the splitfire) and plug that into your game... then plug your vs harness into the splitfire... then plug your PCB into the vs harness.How did you make the video amp and then distribute to both cabs? I would like 2 sources( two cabs) and another one to convert to hdmi(by ossc) and then plug into a recording interface.