I have a high power (6000W) sub-woofer amplifier which has a switch mode power supply. This amplifier only worked few hours before it stopped working and it looks like an issue in the power supply. Amp is connected to AC mains at 240V which drops quite a lot to around 180V sometimes. It is also possible that the frequency is not stable at 50Hz either. Can such fluctuations affect switch mode power supply reliability?

  • \$\begingroup\$ I would assume that the power supply for a 6-kW application includes protections usually found in these types of converters: brown-out (low input), short circuit protection, output overvoltage protection etc. Frequency is not an important parameters considering a front-end pre-converter (a PFC). However, it depends how the mains fluctuates and if surges are present. Did you check the fuse? : ) \$\endgroup\$ – Verbal Kint Apr 16 at 9:20
  • \$\begingroup\$ So you have 8,000 watts coming from the Mains, delivering 7,000 watts to a switching-class audio PA that delivers 6,000 watts to the speakers. Notice I'm assumed 1,000 watts losses in both the power supply and in the amplifier(switcher). Is there FAN COOLING for both? \$\endgroup\$ – analogsystemsrf Apr 16 at 10:28
  • \$\begingroup\$ @analogsystemsrf yes you assumptions are correct. Fan cooling is available. \$\endgroup\$ – simon johnson Apr 25 at 7:32

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