As an electronics engineer, maybe I can clear up some misconceptions above. Yes Radioman, it's OK to have the system on, except the amp - good breakin method for interconnecs. But obviously this will not breakin the amp, the power cord for the amp, speaker cables, or the speakers. A tuner as signal-source is a great breakin tool for interconnects. CD player on repeat-mode works too, but for prolonged breakin you're wearing out the mechanics. However, you must have signal-current flowing through the cables. For current to flow through the cable, you must have a load connected. An amplifier input still provides that load, whether it's powered on or off. But in the case of a preamp input, the jacks which your cables are plugged into must be selected (ie: if plugged into aux 1, then your preamp input switch must be selected on aux 1 for a load-termination to appear at those jacks). Cable breakin boxes are another alternative, but are pricey, & will see little use for your $ unless you frequently change cables or hardware. Some dealers have these breakin boxes, & will do this for you if you buy cables from them (Granite Audio does this). I've been through this experience several times. The most aggravating was with some expensive Synergistic interconnects, which kept going bright-dark-bright. I finally ran them from my tuner into a dummy load for a month, then all was fine & these are great cables. The dummy load I used was a cassette deck's inputs (rarely used at our house anymore). You can even buy some cheap female RCA's at Radio Shack & solder 47k-ohm terminations across them for use as dummy loads. Feel free to inquire further if you're still unsure; email me via member-lookup & I'll be happy to assist.