900W H-class PA Amp with Limiter

apex transistor protect issue

hi apex sir ,this protect not suitable for h900 at 45 v ac rms relay automatic off then on please tell me how to modify this protect circuit but dc sense is very good.i made four all have same problems. plz tell me how to fix.thanks.
 

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hi, guys.
I have a question.
please answer me anyone.
I have two amplifier
1)2 nos apex b500 rail voltage is +55 0 -55v DC.playing in bridge mode in 4 ohms load.
2) 1 nos apex H900 rail voltage ia +110 +55 0 -55 -110 DC . playing in 4 ohms load .

so what is the difference between
1) audio quality ,bass response.
2) stability