As a couple of others mentioned, this sounds like a truly bad idea (to me). A lot of dealers will say almost anything to justify whatever they're doing at the time; I've seen audio salesmen destroy cartridges, power amps, etc. because of ignorance or carelessness. If you really enjoy doing this, go ahead, but if I were you I'd read Fatparrot's advice about 10,000 times before doing it again.......it's exactly the thing you shouldn't do--sooner or later your fingers will slip on the speaker cables or "something" while doing this & you will be a very sad guy........
>>The dealer switched out the cables without powered down the system. He told me there is tremendous surge of force into the speakers when flipping the amp switch of high current amplifier that can damage speakers.>>