We ordered two of these power supplies to get our speaker system working in our new house. We kept hearing a hum/buzz in the speakers and couldn't figure out where it was coming from. Finally, I just found out that when those packs were turned off, the buzzing stopped. I ordered from another supplier and now it doesn't buzz anymore. Very disappointed that the return window has closed on these packages as we are now stuck with over $200 worth of useless power supplies. I would really appreciate it if you returned at this stage - it doesn't appear they have been abused in any way. I thank you for your help.
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