Well done to Ashdown. Another suggestion re Speakon plugs. Make sure, if you are assembling leads yourself, that you do not allow any stray cable filaments to short to the wrong terminal. It can happen, when you insert the stripped ends of the cables into the terminal recesses in the plug, that a single filament of copper will pass the wrong side of the plastic separator and cause a short. The terminals are close together and the space you have to work in on the plug is quite small, especially with the two pole ones.
As others suggest, make sure you use the real McCoy. Some of the copies do not mate well. I found this when I tried to use a speaker cable someone gave me which had no-name copies on it. It did not fit smoothly into a real Speakon socket or make good contact. Buy nice or buy twice, as the saying goes.