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WTB WTB 48v 10 am power supply for TPA3255

Wanted to buy
Right here in swap meet. Ebay deal
Depending on your offer to the seller, could be a good deal on a high quality supply ($75 is a great price, less would be phenomenal).
Otherwise, there are passable SMPS available on AliExpress for less, but ultimately unknown quality.
 
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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