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Amp2 Outside

I'm planning to build/mount three separate 3b+'s with the Amp2 to drive three sets of outdoor speakers around the yard. (2 on one side of the house and 1 on the other.)

I've got 3 waterproof ABS project boxes and plan on mounting all the components including power supplies inside and running speaker wire to outdoor rated speakers...

I have few questions I'm hoping the community / hifiberry support can help me with.

First, I'm a little worried about heat inside the box.  Any ideas on what might be generated and how to handle it?  I live in Southern California... It can get really hot here in the summer.

The Pi's will have WiFi going (separate usb adapter and antenna) to connect to my network and run shairport-sync...

The next challenge is the power supply.  What should I do there?  I know there is a thread on power supplies, but I'm looking for something that will live in a plastic box outside mounted to a wall outside...  Something that will power the Pi, Amp2, WiFi and the speakers...

The speakers I'm going to use are Polk Audio Atrium 4's... They are 8 ohm and up to 80w per channel... I realize the Amp2 is only 30w per channel, but I don't think I'll need all that given the coverage I'm planning...

Anyway, anyone have any thoughts or maybe have done something like this already?

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