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My 5A const/7A surge PSU is fine with the RNS-E only but if I have the cluster and a couple more devices connected it overheats. A 10A PSU should be sufficient, I'm usually using an old PC PSU when I need more devices but it's somehow noisy due to the fan. The fuse in the RNS-E is 15A, that should be the max power you need if you use the internal speaker out for something.
 
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