Hypex UCD 400 Modules Question

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I've just installed two Hypex modules as the output stage on a Plinius 8150 that had blown its own output stage. The amp sounds great but I have one little issue. Sometimes the amp will trip my RCD on switch on. This happens let's say once in 20 switch ons. The amp modules are not earthed at all, and the Plinius preamp floats its signal neutral.

Anyone any ideas?
 
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