Quick PHD2 question

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I've tried to find some pics of the setting online and I have seen a few where it was just maxed out. I have an older earthquake 200dhc here which appears to have a similar drive circuit and it is centered so thats why I started there. When I received this amp in the pot was maxed out but it was also blown so you never know what somebody else did to it. Is it necessary to set the bias in this amp or am I getting that confused with class ab.
 
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