The PSU is configured as a low noise low pass filter. However, the standard 2 capacitor setup is totally acceptable as the PSU rejection is very high on these PCBs. The ground loop breaker rectifier should be 25 Amps or more. There are two holes for a two wire bicolour LED, this will flash if the amplifier is clipped.
For a full explanation of power amp wiring see the excellent PowerPoint Presentation (hifisonix.com)
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