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WTB WTB 48v 10 am power supply for TPA3255

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Two of these (Amazon) would be cheap to experiment with. If they can be used in parallel (this needs verifying by someone smarter than me — @TonyTecson?) you would have nearly the power you’re asking for.

I recently used two of the 24V versions (one per channel) in a class D build. They work fine. I added Mark Johnson’s SMPS filter to each.
 
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