41Hz output relay question

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I'm trying to decide between an Amp5, Amp10 or Amp10-Basic. How do the Amp10 (not 10-Basic) and the other 41Hz amps without output relays have over/under voltage protection, as well as over current and temp protection...is there an internal relay in the Tripath chip? If so, what's the advantage of the output relay on the Amp5 and Amp10-Basic?

and yes I tried searching
 
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