IRS2092S with AC input tested?

I was looking at some of the IRS2092S amps and ran across this one with AC input for power on and speaker protection. This seems unnecessary to require 110/220 for amp power on just to prevent speaker power on and off thump.

Has anyone tested these? Maybe someone could explain the benefits of this design.
 

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There's no onboard PSU on that module - if there was, why would you need a separate PSU as well? (not to mention that there are no PSU parts on the amplifier PCB). Pretty sure that they have just added a mains sense circuit for the speaker protection circuit - because unlike most of these small amp modules you can actually see a speaker protection relay on this one.