I've fairly recently purchased the MJA Pro 50 sub. I am so impressed with it via the low-level (phono) input, that I wanted to try hooking it up via the high-level input (Neutrik Speakon) connector. I just phoned up MJA and the cost of the cable to do this (Neutrik Speakon connector to 3 bare wire ends) is £30!!! Since I'm fairly handy with the old soldering iron, I thought I'd have a go at making up my own cable. I can get Speakon connector plugs okay (presume I need the 4-pole version?), but need some idea where to solder the wires to. Does anyone have any information on this, or know where I might find it? Also, out of curiosity the cable they sell has three cables - one to left channel +ve terminal, one to right channel +ve terminal and the remaining (black) wire to only ONE of the -ve terminals - not BOTH!!! Does anyone know why this is?