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Hifi equipment and power boards

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Today I dropped off my subwoofer for repair. This is the second time in five years that it has refused to power on. The hifi dealer asked me whether I had it plugged into the mains, or into a powerboard. When I said it was in a power board, he said that power amps and subwoofers should always be plugged into the mains, because they may be damaged by voltage spikes.

That got me thinking. One of my power amplifiers (also plugged into a power board) has blown a few valves over the past few years. Perhaps it is suffering from voltage spikes as well.

I am wondering if there is any truth in this? If I get an electrician to pull another cable from the switch, won't it be wired in parallel, same as a power board? Can anyone please explain the difference to this non-electrician?

Also, does anyone know if there is a power spike filter that one can buy to protect equipment? How would you distribute power if you are like me, and have a limited number of mains plugs ... but a large equipment box count ... if you don't use a power board?

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