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Hey. Iv used this method to power my amp and sub with a psu that has a max wattage if 400. It eventually died as it was old and sqwealed from the start. I have now got another psu with a max wattage off 285. The amp lights up and the psu powers up but there is no sound from the speakers!!!!I only used a singal wire this time, is this the problem or is the psu too low wattage ?