Cliff Jack wiring diagram(please check for errors) Aug 05, 2015If a speaker is not plugged into the output jack, you are better off just plugging the speaker in rather than rushing to turn it off. More damage can be caused by this because of flyback voltage spikes and arcing caused to the windings. I normally buy cheap power resistors and solder them into the switching side of Cliff jacks. Cliff Jack Wiring - Metropoulos Forum Oct 14, 2009As soon as the jack plug in inserted the switched connectors don't make contact any longer and the only wiring in play is the wiring from the unswitched contacts. You can also use this for other purposes too. HiWatt wired their speaker jacks such that if there was no speaker plugged into either jack the speaker outputs would be shorted.