900W H-class PA Amp with Limiter

im sorry
My English is weak And I met with your friends
If a question does not repeat
1:is it H class this amplifier H-900?
2: if it is (H class) why entrance voltage is not set step step?
3:Or section ir2117 of the voltage regulator to operate a simulated class H?
 
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Which of these would you be doing?(H-900)


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